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Lumbar discectomy

96 citationsUpdated Sep 2026

Overview

Lumbar discectomy is indicated for lumbar disc herniation, with nonsurgical management remaining the standard of care for degenerative disk disease [17]. The procedure is appropriate for a broad demographic, including elderly and obese patients with lumbar symptoms [19], as age is not a contraindication for decompressive surgery [38]. In professional athletes, discectomy yields excellent clinical outcomes with postoperative performance scores equivalent to preoperative levels [9], and microdiscectomy facilitates favorable return-to-play rates [11]. While preoperative imaging cannot predict the clinical outcome of percutaneous lumbar discectomy [3], large cohort studies may provide more accurate effectiveness estimates than randomized controlled trials [10].

Recurrent lumbar disk herniation is the most common complication following primary open diskectomy, defined as recurrent back and/or leg pain after a definite pain-free period of at least 6 months [5]. Revision discectomy can achieve results comparable to primary surgery [7], although repeat surgery for recurrent herniation offers a good probability for improvement that is inferior to primary surgery, and patients report lower satisfaction [18]. Additional operations are required more frequently than previously reported [8], with outcomes profoundly deteriorating after the second additional operation [8]. A dose-response relationship exists between the number of previous operations and inferior outcomes in degenerative lumbar conditions [20]. In a military population, 9.6% of patients required two or more revision surgeries after single-level microdiscectomy, and 42.1% of revision patients ultimately underwent lumbar arthrodesis at the same level [14].

Surgical technique selection influences reoperation risk. Microendoscopic discectomy carries a higher reoperation risk compared with microdiscectomy or open discectomy at a median of 4 years of follow-up [56], leading to a recommendation to select microdiscectomy or open discectomy over microendoscopic approaches [56]. Despite this, microendoscopic and open microdiscectomy yield the same clinical outcome [84], though the former may result in an increased reoperation rate [84]. Biportal endoscopic discectomy is as effective as microscopic discectomy for single-level herniation and offers distinct advantages regarding postoperative wound complications [16]. Percutaneous endoscopic lumbar discectomy is a safe and efficacious technique that relieves symptoms and improves quality of life [39]. In pediatric patients, discectomy does not always provide the final solution, but careful selection and follow-up produce satisfactory long-term results in most cases [6].

Anatomy & Pathophysiology

Disc and Spine Anatomy

The human spine contains 23 intervertebral disks that separate the vertebrae and provide flexibility [98]. These disks account for 20% to 30% of the spinal length and increase in size from the cervical to the lumbar regions [98]. Each intervertebral disk consists of a central gelatinous nucleus pulposus (NP) surrounded by a fibrous anulus fibrosus (AF) [98]. The NP comprises a high concentration of proteoglycans and water within a loose type II collagen network [98]. In contrast, the AF has low proteoglycan and water content, with high concentrations of type I collagen and small amounts of type II collagen organized into concentric lamellae [98]. The AF possesses 20 to 25 lamellae rich in collagen fibrils arranged in parallel [98]. Adjacent lamellae feature collagen fibrils oriented in opposite directions along the axis, creating an alternating pattern between layers [98].

Lumbar vertebral bodies are large, with a transverse diameter exceeding the anterior-posterior diameter [95]. Lumbar pedicles arise from the superior aspect of the vertebral bodies and project more horizontally than thoracic pedicles [95]. L1 pedicles are minimally medially angled, but orientation becomes increasingly medial down the lumbar spine, particularly at L5 [95]. The superior articular facet arises at the pedicle-lamina junction, with the articular surface facing dorsomedially [95]. The sagittal orientation of lumbar facet joints permits flexion and extension while resisting axial rotation and translation [95].

In the thoracic and lumbar spine, the named nerve root exits below the named pedicle [92]. Disks are formally named for the vertebral bodies between which they lie, such as the L4-5 disc located between the L4 and L5 vertebral bodies [92]. Lateral recess pathology, such as posterolateral disc herniation, typically involves the next nerve root exiting caudal to that disc [92]. Consequently, an L4-5 posterolateral disc herniation is expected to cause L5 nerve root symptoms [92]. The dorsal root ganglion (DRG) lies within the outer confines of the intervertebral foramen [92].

Disc innervation occurs via afferent axons with cell bodies within the DRG [92]. Animal studies identify two paths between the annulus and the DRG: one from the sinuvertebral nerve and another along the paravertebral sympathetic trunk [92]. In animal models, the lateral annulus is innervated by fibers coursing from the index level and two additional superior levels through the sinuvertebral nerves [92]. The lateral annulus also receives innervation through the sympathetic trunk by the DRG from three levels even more superior than the sinuvertebral innervations [92]. Contralateral DRG involvement occurs through both the sinuvertebral and sympathetic pathways [92]. Similar nonsegmental, multilevel innervation patterns have been reported for the ventral disc surface [92]. Innervations of the disc from the vertebral endplate have been shown through the sinuvertebral nerve and the basivertebral nerve [92]. The density of innervation at the vertebral endplate is similar to that seen in the outer annulus, suggesting the endplates are as important to pain generation as is the annulus [92].

The sinuvertebral nerve is a small filamentous branch of the ventral ramus that progresses medially over the posterior aspect of the disc and vertebral bodies, innervating these structures and the posterior longitudinal ligament [92]. The dorsal ramus courses dorsally, piercing the intertransverse ligament near the pars interarticularis [92]. The medial branch of the dorsal ramus separates into three branches to innervate the facet joint at that level and the adjacent levels above and below [92]. The orientation of nerve roots in the dural sac and at the conus medullaris follows a highly organized pattern, with the most cephalad roots lying lateral and the most caudad lying centrally [96]. Motor roots are ventral to the sensory roots at all levels [96]. The arachnoid mater holds the nerve roots in their specific positions within the dural sac [96].

Neural Elements and Stenosis Anatomy

Central spinal stenosis denotes involvement of the area between the facet joints, which is occupied by the dura and its contents [91]. Symptomatic central spinal stenosis results in neurogenic claudication with generalized leg pain [91]. The lateral recess, also known as “Lee’s entrance zone,” begins at the medial border of the superior articular process and extends to the medial border of the pedicle [91]. The borders of the lateral recess are the pedicle laterally, the superior articular facet dorsally, the posterior ligamentous complex to disc and floor of the canal, and the central canal medially [91]. Facet arthritis most frequently causes stenosis in the lateral recess zone, along with vertebral body spurring and disc or anulus pathology [91].

“Lee’s midzone” describes the foraminal region, which lies ventral to the pars [91]. The borders of the foraminal region are the lateral recess medially, the posterior vertebral body and disc ventrally, the pars and intertransverse ligament dorsally, and the lateral border of the pedicle laterally [91]. The dorsal root ganglion and ventral motor root occupy 30% of the foraminal space [91]. The exit zone is identified as the area lateral to the facet joint [91]. The nerve root in the exit zone can be compressed by a “far lateral” disc, spondylolisthesis and associated subluxation, or facet arthritis [91].

Normal foraminal height is 20 to 30 mm and superior width is 8 to 10 mm [52]. The central canal is defined as the space posterior to the posterior longitudinal ligament, anterior to the ligamentum flavum and laminae, and bordered laterally by the medial border of the superior articular process [52]. The lateral recess is defined by the superior articular facet posteriorly, the thecal sac medially, the pedicle laterally, and the posterolateral vertebral body anteriorly [52]. The intervertebral foramen is bordered superiorly and inferiorly by the adjacent level pedicles, posteriorly by the facet joint and lateral extensions of the ligamentum flavum, and anteriorly by the adjacent vertebral bodies and disk [52].

Pathophysiology of Degeneration and Herniation

The degenerative process has been divided into three separate stages with relatively distinct findings: dysfunction, instability, and stabilization [66]. The first stage of spinal degeneration is dysfunction, seen in individuals 15 to 45 years old, characterized by circumferential and radial tears in the disc anulus and localized synovitis of the facet joints [66]. The second stage of spinal degeneration is instability, found in 35- to 70-year-old patients, characterized by internal disruption of the disc, progressive disc resorption, degeneration of the facet joints with capsular laxity, subluxation, and joint erosion [66]. The final stage of spinal degeneration is stabilization, present in patients older than 60 years, characterized by progressive development of hypertrophic bone around the disc and facet joints leading to segmental stiffening or frank ankylosis [66]. Disc herniation is considered a complication of disc degeneration in the dysfunction and instability stages [66]. Spinal stenosis from degenerative arthritis is a complication of bony overgrowth compromising neural tissue in the late instability and early stabilization stages [66]. The natural history of degenerative disc disease is one of recurrent episodes of pain followed by periods of symptomatic or complete relief [66].

The natural history of lumbar disc herniation seems generally to be favorable [37]. The causes of lumbar disc herniation comprise a complex combination of mechanical and biologic processes [37]. Genetic factors are more important than mechanical stresses in the development of disc herniations [55]. The development of a disc herniation is only one of the pathways that the degenerative disc may follow [55]. The disc may become the primary source of pain rather than the nerve root, as is the case with herniations, in a condition known as internal disc derangement (IDD) [55]. IDD is defined as a pathologic condition resulting in axial spine pain with no or minimal deformation of spinal alignment or disc contour [55]. IDD is distinguished from measurable instability associated with fractures, traumatic ligamentous disruptions, degenerative listhesis, scoliosis, or other conditions [55]. There are no defined criteria for IDD, and the diagnosis requires a compilation of findings consistent with IDD and elimination of other diagnostic possibilities [55].

Patients with IDD are usually relatively young, in the third to sixth decades of life [55]. Pain in IDD is usually chronic with symptoms present for several years, although the pain may have become constant or very frequent only in the previous several months [55]. Pain in IDD is axial primarily, often with buttock and posterior thigh (sclerotomal) pain [55]. Pain distal to the knee in IDD indicates either different or coexistent pathology [55]. Positions and activities that increase intradiscal symptoms, such as sitting or flexion, should exacerbate IDD symptoms [55]. Recumbency, especially in the fetal position, often decreases IDD pain [55]. Examination of a patient with IDD reveals no weakness or reflex changes if IDD is the only diagnosis [55]. Lumbar range of motion in IDD is mildly limited, especially in flexion, and limitation is caused by lumbosacral pain or tightness [55]. Straight-leg raising in IDD typically causes back and buttock pain but no pain distal to the knee [55]. There is no spasm in the paraspinal musculature in IDD, and extension usually gives some relief temporarily [55]. The patient with IDD often has a depressed mood and should be questioned about changes or stresses at work and at home [55]. If a patient with suspected IDD has identified significant stresses, anger, or anxiety, the diagnosis of IDD is in question [55]. If three or more Waddell signs are present, an alternative diagnosis to IDD is more likely [55]. The examination for IDD must include the hip joints as a possible cause of buttock and thigh pain [55].

Lumbar spondylosis is due to a degenerative cascade that has an association with intervertebral disk degeneration (IDD) [93]. Mechanical progression and associated disk space narrowing leads to adjacent level pedicle approximation with narrowing of the superior-inferior dimensions of the intervertebral foraminal canal [93]. Laxity of associated ligaments and vertebral column translates into altered loading mechanics and an altered pressure relationship on the vertebral bone and joint surfaces, which influences osteophyte formation and facet joint hypertrophy [93]. IDD is a complicated multifactorial process characterized by altered biomechanics of loading, an imbalance of extracellular matrix synthesis and degradation, increased secretion of proinflammatory cytokines, and increased apoptosis and senescence in the nucleus pulposus (NP) cells [93]. Altered biomechanics in IDD lead to further degenerative changes and osteophyte formation [93]. IDD has the potential to cause lumbar central and foraminal stenosis leading to symptomatic nerve compression and radiculopathy [93]. Lumbar spondylosis is a common condition with an estimated prevalence ranging from 40% to 85% [93].

LSS is the final stage of a cascade of events where the event that begins the process is thought to be disk degeneration [52]. As disk height decreases, the loading characteristics of the facets are altered [52]. Facet joint capsules become incompetent, leading to capsular, ligamentum flavum, and facet hypertrophy [52]. The ligamentum flavum also becomes less pliable with age [52]. The final stage of the LSS continuum of changes is a decrease in the diameter of the spinal canal [52]. When the spine is in extension, the spinal canal diameter diminishes resulting in buckling of the shortened, hypertrophied ligamentum flavum [52]. In flexion, a relative increase in the spinal canal diameter is present [52]. Most authors support a multifactorial etiology of low back pain and leg pain associated with LSS, including mechanical compression, nutritive insufficiency, heredity, structural decompression, individual pain perception, and chemical insult [52].

Degeneration of the disc occurs with disc narrowing and subsequent ligamentous redundancy, which compromises the spinal canal area [91]. Instability may ensue from disc degeneration and ligamentous redundancy [91]. Relative hypermobility precipitates the formation of facet overgrowth and ligamentous hypertrophy [91]. The ligamentum flavum may be markedly thickened into the lateral recess where it attaches to the facet capsule, causing nerve root compression [91]. These phenomena occur alone or in combination to create the symptom-complex characteristic of spinal stenosis [91]. The most common type of spinal stenosis is caused by degenerative arthritis of the spine, including Forestier disease, and is characterized by hyperostosis and spinal rigidity in elderly patients [91]. Other processes such as Paget disease, fluorosis, kyphosis, scoliosis, and fracture with canal narrowing may result in spinal stenosis [91]. Hypertrophy and ossification of the posterior longitudinal ligament, usually confined to the cervical spine, and diffuse idiopathic skeletal hyperostosis (DISH) syndrome may result in an acquired form of spinal stenosis [91].

Congenital forms of spinal stenosis caused by disorders such as achondroplasia and dysplastic spondylolisthesis are much less common [91]. Congenital spinal stenosis usually is central and is evident on imaging studies [91]. Idiopathic congenital narrowing usually involves the anteroposterior dimension of the canal usually to short pedicles, with the posterior otherwise normal [91]. In achondroplasia, the canal is narrowed in the anteroposterior plane owing to shortened pedicles and in lateral diameter because of diminished interpedicular distance [91]. Acquired forms of spinal stenosis usually are degenerative [91]. The degenerative process for acquired stenosis is most commonly localized to the facet joints and ligamentum flavum, with resultant arthritic changes visible on radiographic studies [91]. Abnormalities in acquired degenerative stenosis are frequently symmetric bilaterally [91]. The L4-5 level is the most commonly involved in acquired degenerative stenosis, followed by L5-S1 and L3-4 [91]. Disc herniation and spondylolisthesis may exacerbate the narrowing further in acquired stenosis [91]. Spondylolisthesis and spondylosis rarely cause spinal stenosis in young patients [91].

Chemical factors may play a role in radiculopathy caused by lumbar disk herniation [123]. Inflammatory cytokines produced from the cartilage, ventral capsule, and synovial tissue of the facet joints are linked to the advancement of osteoarthritis and generation of pain [123]. TNF-α, interleukin-1β (IL-1β), and interleukin-6 (IL-6) can be found in the facet joint tissues in degenerative lumbar disorders [123]. IL-6 from the synovium and cartilage of the facet joints is elevated mainly in lumbar spinal canal stenosis and related degenerative conditions [123]. IL-1β is present in higher concentrations with lumbar spinal stenosis and degenerative changes compared with lumbar herniated disks [123]. Higher expression of IL-1β has a higher association with leg pain and declining quality of life in lumbar degenerative patients when compared with other inflammatory cytokines [123]. IL-1β simulates the production of MMPs through activation signaling pathways [123]. IL-1β and MMPs are markedly increased in degenerative facets, leading to further proteoglycan degeneration and destruction of the cartilage and joint [123].

Adiponectin has a multimeric structure and circulates in the blood as low-molecular-weight (LMW) and high-molecular-weight (HMW) complexes [123]. HMW adiponectin has a proinflammatory response whereas the LMW isoform has an anti-inflammatory function [123]. Adiponectin has the potential to be a catabolic mediator of osteoarthritis by increasing several MMPs and inducible nitric oxide synthase (iNOS) [123]. Adiponectin was identified in the process of facet joint osteoarthritis and shown to have greater expression for facet joint osteoarthritis when compared with IL-1β and TNF-α [123].

Classification

Disc Degeneration Grading

Pfirrmann: This classification grades lumbar disc degeneration from Grade I to V based on sagittal T2-weighted MRI [144]. Grades IV and V are defined as advanced stages of intervertebral disc degeneration [144].

Modified 8-Grade System: A modified system for lumbar disc degeneration comprises 8 grades representing a progression from normal disc to severe degeneration [142]. In this system, Grade 1 corresponds to no disc degeneration and Grade 8 corresponds to end-stage degeneration [142].

Migrated Disc Herniation Classification

Modified Migrated Herniation Classification: A modified classification for migrated lumbar disc herniation has good reliability [72]. The experience level of spine surgeons does not affect the reliability of this modified classification [72].

Calcified Disc Herniation Classification

Song’s Classification: Song's classification system for calcified lumbar disc herniation has demonstrated value in guiding personalized surgical decision-making [188].

Paraspinal Muscle Fat Infiltration Classification

4-Grade Fat Infiltration System: A 4-grade fat infiltration system is more effective than a 3-grade system in determining the level of fat infiltration in paraspinal muscles [185, 187]. It is also more effective than a 3-grade system in predicting lumbar disc herniation [185, 187].

Diagnostic Classification

Clinical Examination: Clinical examination findings are evaluated for their ability to identify the most common patho-anatomical disorders in the lumbar spine [25].

Clinical Presentation

Lumbar disc herniation is among the most common causes of lower-back pain and sciatica [37]. The natural history is generally favorable, with most herniations, particularly contained ones, resorbing and diminishing in size over time [138]. Approximately 90% of patients experience symptomatic improvement without surgery within 3 months of symptom onset [138]. In young, active patients, low back pain is most often a self-limiting episode without underlying etiology [131]. More than half of patients seeking treatment for low back pain recover in 1 week, and 90% recover within 1 to 3 months [41]. The natural history of degenerative disc disease is characterized by recurrent episodes of pain followed by periods of symptomatic or complete relief [66].

Patients typically present with varying degrees of back and leg pain [138]. Leg pain usually follows the dermatomal path of the affected nerve root(s) [138]. Radicular pain may be accompanied by motor, sensory, and/or reflex disturbances [138]. The presence of sciatica is the most sensitive and specific finding for lumbar disc herniation [138]. Lumbar disc herniation may or may not be associated with an inciting event such as load bearing [138]. Diskogenic pain related to disc degeneration or disc herniation may be worse in flexion, while sitting, or with prolonged axial loading [139]. This pain is often described in a diffuse, bandlike distribution [139]. Residual low back pain after discectomy may reflect increased load and pressure on the disc and endplate in the sitting position [15].

The clinical presentation of recurrent disc herniation may be identical to that of primary herniation but usually has a larger component of axial pain [33]. Most recurrences happen in the relatively early postoperative period, primarily the first 6 months after surgery [33]. Cauda equina syndrome secondary to large central lumbar disc herniations is rare [138].

On physical examination, the ipsilateral hip and knee may be flexed and externally rotated to relieve root tension [138]. Pain with straight leg raise testing results from increased nerve root tension and a lack of normal excursion of the root at the herniation site [138]. The straight leg raise must produce radicular symptoms in the distribution of the provoked root; for the sciatic nerve, that means pain distal to the knee [138]. For detecting lumbar disc herniation, the straight leg raise is more sensitive but less specific than the contralateral straight leg raise in patients with single leg radicular pain [139]. A positive crossed straight leg raise test has a higher specificity than a positive ipsilateral test, but the sensitivity varies [138]. Contralateral straight leg raise puts tension on the involved root from the opposite direction [138].

Specific provocative maneuvers include: Lasegue sign: Straight leg raise radiculopathy aggravated by ankle dorsiflexion [138]. Bowstring sign: Straight leg raise radiculopathy aggravated by applying pressure over the popliteus fossa [138]. Kernig test: Flexing the neck chin to chest, flexing the hip to 90°, and then extending the leg similar to straight leg raise to reproduce radiculopathy [138]. Femoral stretch test: Performed with the patient prone to stretch the femoral nerve roots and test L2 to L4 irritation [138]. Naffziger test: Compression of neck veins for 10 seconds with the patient lying supine, followed by coughing to reproduce radiculopathy [138]. Milgram test: The patient raises both legs 3 inches off the examining table and holds this position for 30 seconds, which may reproduce radiculopathy [138].

In discogenic back pain, a paucity of physical findings is characteristic [41]. Back pain is greater than leg pain, and there is no radiculopathy or absence of tension signs [41]. The five categories of nonorganic or psychologic pain signs are tenderness, simulation, distraction, regional disturbances, and overreaction [139]. The presence of three or more Waddell signs should prompt the provider to evaluate for other etiologies of the reports such as depression, hypochondriasis, or secondary gain issues [139]. The presence of three or more Waddell signs is associated with higher pain scores and poorer treatment outcomes overall [139].

Abnormal magnetic resonance scans of the lumbar spine are found in asymptomatic subjects [64]. It is difficult to distinguish a peridural scar from a small recurrent herniation on MRI [33]. MRI with intravascular contrast material has been helpful in identifying recurrent herniations [33]. For patients with a history of no or minimal improvement after disc excision, diagnostic difficulties are greater and must consider incorrect original diagnosis, incorrect level, root anomaly, root injury, CSF leak, and infection in addition to recurrent disc herniation [33]. Discography is a controversial study designed as a preoperative study to correlate MRI findings with a clinically significant pain generator [41]. Evidence suggests that annular tears created by the needle during discography may accelerate the rate of symptomatic disc degeneration [41]. As a result of potential acceleration of degeneration, discography is falling out of favor [41]. This is the first comprehensive systematic review of diagnostic accuracy studies that evaluate clinical examination findings for their ability to identify the most common patho-anatomical disorders in the lumbar spine [25]. In patients with cervical radiculopathy, the type and extent of disc herniation measured on MRI prior to surgery correlated neither to the severity of the symptoms at presentation nor to clinical outcomes at two years postoperatively [46].

Prognostic factors and patient populations vary. In adults with lumbar disc herniation undergoing lumbar discectomy, more severe preoperative paraspinal fatty infiltration is associated with recurrence or reoperation, residual/chronic low back pain, and poorer functional recovery [68]. Patients with Modic changes had a higher incidence risk of recurrent lumbar disc herniation [77]. Old age, severe grade of surgical-level disc degeneration, and more disc degeneration levels significantly increased the incidence of complications in percutaneous endoscopic transforaminal discectomy [44]. Following lumbar diskectomy, clinical and nonclinical factors were associated with prescribing opioids and prescribed MME [12].

In specific populations, adolescent lumbar disc herniation has a lower incidence than adult lumbar disc herniation but is increasing [154]. A discectomy does not always provide the final solution to lumbar disc disease in children, but careful selection of patients and follow-up can produce satisfactory long-term results in most [6]. Among professional baseball players in their 30s, lumbar degeneration was more advanced, and degenerative diseases such as discogenic pain occurred more frequently [30]. Clinical outcomes based on statistical performance measures are excellent after discectomy in National Football League athletes, with postoperative Performance Scores equivalent to preoperative levels [9]. Surgical management of selected lumbar spine conditions can produce excellent outcomes in athletes of all sports, with microdiscectomy for lumbar disc herniation leading to favorable return to play rates [11]. The data suggest that it is reasonable to operate on patients who are elderly and obese and who have lumbar symptoms, with the appropriate indications [19].

Investigations

Imaging and Diagnostic Studies

MRI: Magnetic resonance imaging is the standard for advanced spinal imaging, offering superior capability to CT for identifying infections, tumors, and degenerative changes within discs [101]. It is also superior to CT for directly imaging neural structures and the nerve root within the foramen [101]. MRI evidence of lumbar disc degeneration is present in 35% of patients aged 20 to 39 years and in 100% of patients older than 50 years [101]. However, findings on magnetic resonance scans are not predictive of the development or duration of low-back pain in asymptomatic subjects [79]. In patients with cervical radiculopathy, the type and extent of disc herniation measured on MRI prior to surgery correlated neither to the severity of symptoms at presentation nor to clinical outcomes at two years postoperatively [46]. A positive MRI T2-weighted image of the lumbar disc with a high-intensity zone (HIZ) indicates disc degeneration and may be a specific indicator for the physical diagnosis of discogenic low back pain [174]. Modic changes, particularly Type 2, are common radiological findings in lumbar spine imaging, most frequently occurring at L4/L5 and L5/S1 levels [80]. The presence and progression of lumbar spinal endplate lesions are mainly attributed to lumbar disc herniation and higher hip circumference in men [71].

CT: Computed tomographic analysis suggests a general lumbar muscle dysfunction in the pain group, particularly of the deep stabilizing muscle system [82].

Myelography: Myelography may be unnecessary if clinical and CT or MRI findings are in complete agreement [108]. Primary indications include inability to obtain an MRI, suspicion of an intraspinal lesion, patients with spinal instrumentation causing artifact, or questionable diagnosis resulting from conflicting clinical findings [108]. The procedure is valuable in a previously operated spine and in patients with marked bony degenerative change that may be underestimated on MRI [108].

Clinical Examination and Prognostic Factors

Prognostic Factors: A correction to a systematic review regarding physical prognostic factors predicting outcome following lumbar discectomy surgery does not contain new clinical conclusions or data [2]. Clinical and nonclinical factors were associated with prescribing opioids and prescribed MME following lumbar diskectomy [12]. A dose-response relationship exists between increasing number of previous operations and inferior outcomes among patients operated for degenerative conditions in the lumbar spine [20].

Other Considerations: Patients who are diabetic, smokers, or have contained disk herniation on MRI should be counseled for a higher risk of recurrence after biportal endoscopic diskectomy [190].

Treatment

Non-Operative

Nonoperative treatment for lumbar disc herniation is usually effective and serves as the primary management strategy [124]. Principles of conservative care include short-term rest, pain relief, antiinflammatory agents, and progressive directed activity restoration [124]. These measures generally should be continued for at least 6 to 12 weeks if feasible [124]. Most lumbar spine pathologies in recreational athletes can be managed nonsurgically with excellent outcomes [13]. Spontaneous resorption of lumbar disk herniation represents a promising avenue for non-surgical management, associated with mechanisms such as inflammation, neovascularization, and macrophage infiltration [146].

Operative

Indications: Surgery is recommended for lumbar disc herniation if neurologic deficits progress or manifest as myelopathy, or if pain remains at an intolerable level [124]. Surgical treatment is a viable option with good outcomes for recreational athletes who fail nonsurgical treatment or have neurological risk [13]. Inclusion criteria for lumbar disc herniation surgery typically include low back pain with radiating pain or numbness, imaging consistent with clinical symptoms, no history of lumbar spine surgery, and no improvement after 3 months of conservative treatment or the presence of nerve damage symptoms [35]. For open fenestration discectomy, inclusion criteria involve patients with symptomatic L4-L5 disc herniation who have failed conservative treatment for 6 weeks [60]. The diagnosis of recurrent disc herniation is significantly more difficult than that of primary disc herniation, often presenting with a larger component of axial pain [33]. MRI with intravascular contrast material has been helpful in identifying recurrent herniations, though it is difficult to distinguish a peridural scar from a small recurrent herniation [33].

Surgical Approach / Technique: Biportal endoscopic discectomy (BED) is as effective as microscopic discectomy (MD) in treating single-level lumbar disc herniation but has distinct advantages in terms of postoperative wound complications [16]. Percutaneous endoscopic lumbar discectomy is a safe and efficacious technique to relieve symptoms of herniated discs, with improvements in back pain and leg symptoms translating to improved quality of life [39]. Percutaneous endoscopic lumbar discectomy under local anesthesia yielded remarkable improvements in pain and disability across all symptom severity groups [57]. Fully endoscopic transforaminal discectomy may be an effective and alternative treatment option for the upward migration of disc herniation in the upper lumbar area [125]. The one-hole split endoscopy (OSE) technique is an effective minimally invasive surgical option as well as the unilateral biportal endoscopy (UBE) technique in the treatment of L5-S1 lumbar disc herniation [129]. Aggressive discectomy is associated with longer operation times and greater postoperative reductions in disc height index and Modic changes compared to limited discectomy [43]. A modified tubular discectomy technique with safe scar dissection is effective for recurrent lumbar disc herniation treatment [168]. The transforaminal endoscopic approach can be used for recurrence after a traditional microdiscectomy, and if both primary and recurrence approaches are transforaminal, the total level of invasiveness is typically less than a primary microscopic approach [33]. A targeted and quantificational foraminoplasty device is efficient and safe for percutaneous transforaminal endoscopic discectomy in treating lumbar disc herniation at the L5–S1 level [167]. The use of a body surface-assisting puncture device in percutaneous transforaminal endoscopic lumbar discectomy can significantly reduce the number of punctures and X-ray fluoroscopy radiation dose, as well as shorten operation time, without increasing surgical complications [194]. Biportal endoscopic spine surgery (BESS) for lumbar laminectomy and diskectomy has a learning curve of 31 cases for adequate performance [170]. Gradient local anesthesia can satisfactorily and safely control intraoperative pain during percutaneous endoscopic lumbar discectomy via the interlaminar approach [186]. It is crucial to meticulously evaluate the indications for spinal anesthesia in percutaneous interlaminar endoscopic lumbar discectomy due to potential risks associated with this form of anesthesia [184].

Implant Selection: The DIAM implant could be considered a useful intermediate step procedure for lumbar disc herniation surgery [27].

Pain Management: There is relatively strong evidence that intraoperative epidural steroids are effective in reducing pain in the early stage and reducing consumption of analgesia [58]. Epidural injection of dexamethasone and vitamin B12 effectively reduces early postoperative low back and leg pain, lowers postoperative inflammatory factor expression, and improves early percutaneous endoscopic interlaminar discectomy outcomes [192].

Adjuncts: Closed drainage is beneficial for reducing postoperative low-grade fever and relieving pain in the operation area in the very early postoperative stage following single-level lumbar discectomy [31].

Setting of Care: Patients are limited in bending, lifting, and twisting after transforaminal endoscopic thoracic discectomy, but may shower the day of the procedure [133]. Trunk stabilization therapy can begin at 2 weeks after transforaminal endoscopic thoracic discectomy and advance as tolerated [133]. Driving is delayed until postoperative day 2 or until narcotics are discontinued after transforaminal endoscopic thoracic discectomy [133].

Revision: Additional operations after primary disc surgery are needed more frequently than previously reported, and the outcome profoundly deteriorates after the second additional operation [8]. Within a military population cohort, 9.6% of patients would require two or more revision surgeries and 42.1% of these revision microdiscectomy patients would ultimately undergo a lumbar arthrodesis at the same level as the initial disk herniation [14].

Other Considerations: No operative technique has been shown to reduce the incidence of recurrent disc herniations, which is reported in 3% to 7% of patients [33]. More aggressive disc removal does not reduce the incidence of recurrent disc herniations [33]. Full functional recovery from back surgery can be protracted [26]. Full endoscopic transforaminal discectomy remains a safe and effective surgical intervention for treating herniated lumbar discs in the context of obesity [122]. Following lumbar diskectomy, clinical and nonclinical factors were associated with prescribing opioids and prescribed morphine milligram equivalents (MME) [12].

Complications

Recurrence and Reoperation

Long-term follow-up data indicates that the rate of reoperation reaches 15% at eight years post-enrollment [107]. The timing of these interventions is front-loaded, with 40% of reoperations occurring within the first year, 55% by two years, 71% by four years, and 86% by six years [107]. Recurrent disc herniation accounts for 62% of reoperation indications, while complications or other factors contribute to 25% [107]. Clinical outcomes deteriorate profoundly after the second additional operation [8], and patients undergoing repeated surgery report lower satisfaction compared to those undergoing primary surgery [18]. In a military population, 9.6% of patients required two or more revision surgeries [14]. Among revision microdiscectomy patients, 42.1% ultimately underwent lumbar arthrodesis at the same level as the initial disk herniation [14].

Technique-specific data reveals that the percutaneous endoscopic lumbar discectomy group exhibited higher reoperation rates compared with the open discectomy group [197]. Conversely, full endoscopic lumbar discectomy combined with annulus fibrosus repair reduces the postoperative recurrence rate [198].

Intraoperative and Early Postoperative Complications

Incidental dural tears have a more significant effect on in-hospital morbidity, mortality, and healthcare burdens in lumbar spinal decompression than in lumbar discectomy [109]. Regarding infectious and wound outcomes, the percutaneous endoscopic lumbar discectomy group showed lower infection rates compared with the open discectomy group [197]. Biportal endoscopic discectomy offers distinct advantages in terms of postoperative wound complications compared to microscopic discectomy [16].

Postoperative management strategies influence early recovery. Closed drainage is beneficial for reducing postoperative low-grade fever and relieving pain in the operation area in the very early postoperative stage for single-level lumbar discectomy [31]. Intraoperative epidural steroids are effective in reducing pain in the early stage and reducing consumption of analgesia [58].

Specific complications associated with endoscopic approaches include negative pressure pulmonary edema, which is an infrequent complication of percutaneous endoscopic interlaminar lumbar discectomy [69]. Post-operative dysesthesia due to existing dorsal root ganglion injury is a unique complication of percutaneous endoscopic lumbar discectomy [171]. In a series of 37 patients with highly downward migrated lumbar disc herniation treated with full-endoscopic foraminoplasty, 4 patients experienced postoperative dysesthesia and 1 patient experienced recurrence [112]. In a series of 96 patients treated with unilateral biportal endoscopic discectomy or percutaneous endoscopic interlaminar discectomy for migrated lumbar disc herniation, postoperative complications occurred in 3.2% and 3.1% of the groups respectively [113].

For very highly up-migrated lumbar disc herniation treated with a novel vertebral trench technique, three cases had transient paresthesias after surgery which disappeared in 2 to 3 weeks, with no cases of nerve injury, CSF leakage, or wound infection [161]. In a series of patients treated with transforaminal endoscopic discectomy for recurrent lumbar disc herniation, no procedure-related complications such as nerve root injuries, epidural hematoma formation, dural laceration, or delayed cerebrospinal fluid leakage occurred [61].

Recovery

Light activity (weeks): Objective activity tracking demonstrates that lumbar surgery results in a decrease in activity amount 1 month just after surgery [149].

Full activity (months): Gradual postoperative recovery occurs within 3 months following the initial postoperative decrease in activity [149].

Complete recovery / outcome plateau (months): The evidence provided does not specify a distinct timeline for complete recovery or outcome plateau beyond the 3-month period of gradual postoperative recovery [149].

Rehabilitation protocol: For single-level lumbar discectomy, closed drainage is beneficial for reducing postoperative low-grade fever and relieving pain in the operation area in the very early postoperative stage [31]. The FASTER trial protocol identifies the between-group difference in score on the Oswestry Disability Index at one-year follow-up as the primary outcome of interest for evaluating functional recovery interventions [26].

Functional milestones: Clinical outcomes based on statistical performance measures are excellent after discectomy in National Football League players, as postoperative Performance Scores were equivalent to preoperative levels [9]. The average rate of return to sport for professional athletes after lumbar diskectomy was 89% [76]. National Football League linemen have high return-to-play rates after lumbar diskectomy [85]. National Football League linemen requiring revision decompression also successfully return to play at high rates [85].

Other Considerations: Increased worker earnings resulting from disc herniation surgery may offset the increased direct medical costs associated with surgery [153]. Recurrent lumbar disk herniation is the most common complication following primary open diskectomy, defined as recurrent back and/or leg pain after a definite pain-free period of at least 6 months [5]. In adults with lumbar disc herniation undergoing lumbar discectomy, more severe preoperative paraspinal fatty infiltration is associated with recurrence or reoperation [68]. More severe preoperative paraspinal fatty infiltration is also associated with residual or chronic low back pain [68] and poorer functional recovery [68]. Following lumbar diskectomy, clinical and nonclinical factors were associated with prescribing opioids and prescribed morphine milligram equivalents [12].

Key Evidence

• [L2] This document describes the protocol for a randomised controlled trial to assess the impact of activity restrictions on clinical outcomes following lumbar discectomy, aiming to provide an evidence base for postoperative care. [1] (10.1186/s12891-017-1681-3)
• [L2] This article is a correction to a previously published systematic review and narrative synthesis regarding physical prognostic factors predicting outcome following lumbar discectomy surgery; it does not contain new clinical conclusions or data. [2] (10.1186/s12891-018-2288-z)
• [L3] Preoperative imaging studies cannot predict the clinical outcome of percutaneous lumbar discectomy. [3] (10.2106/00004623-199504000-00011)
• [L5] Recurrent lumbar disk herniation is the most common complication following primary open diskectomy, defined as recurrent back and/or leg pain after a definite pain-free period of at least 6 months. [5] (10.5435/00124635-201006000-00005)
• [L4] A discectomy does not always provide the final solution to lumbar disc disease in children, but careful selection of patients and follow-up can produce satisfactory long-term results in most. [6] (10.2106/00004623-199805000-00009)
• [L3] Revision discectomy can give results that are as good as those seen after primary surgery. [7] (10.1302/0301-620x.95b1.30413)
• [L3] Additional operations after primary disc surgery are needed more frequently than previously reported, and the outcome profoundly deteriorates after the second additional operation. [8] (10.1302/0301-620x.104b5.bjj-2021-1706.r2)
• [L4] Clinical outcomes based on statistical performance measures are excellent after discectomy in this patient cohort as postoperative Performance Scores were equivalent to preoperative levels. [9] (10.1097/brs.0b013e3181bf8bb5)
• [L1] Large cohort studies and alternative statistical techniques may yield more accurate estimates of the effectiveness of lumbar diskectomy. [10] (10.5435/00124635-200810000-00002)
• [L4] Surgical management of selected lumbar spine conditions can produce excellent outcomes in athletes of all sports, with microdiscectomy for lumbar disc herniation leading to favorable return to play rates and direct pars repair leading to high return to play rates. [11] (10.1016/j.csm.2016.05.006)
• [L3] Following lumbar diskectomy, clinical and nonclinical factors were associated with prescribing opioids and prescribed MME. [12] (10.5435/jaaos-d-24-00908)
• [L5] Most lumbar spine pathologies in recreational athletes can be managed nonsurgically with excellent outcomes, while surgical treatment is a viable option with good outcomes for those who fail nonsurgical treatment or have neurological risk. [13] (10.5435/jaaos-d-24-00979)
• [L3] Within this group, 9.6% would require two or more revision surgeries and 42.1% of these revision microdiscectomy patients would ultimately undergo a lumbar arthrodesis at the same level as the initial disk herniation. [14] (10.5435/jaaos-d-24-00879)
• [L3] Furthermore, residual LBP may reflect increased load and pressure on the disc and endplate in the sitting position. [15] (10.1186/s12891-021-04015-z)
• [L1] BED is as effective as MD in treating single-level lumbar disc herniation but has distinct advantages in terms of postoperative wound complications. [16] (10.1302/0301-620x.107b5.bjj-2024-1560.r1)
• [L5] Nonsurgical management is the standard of care for lumbar degenerative disk disease, while spondylolysis is typically managed nonsurgically with successful outcomes, though surgery may be required for return to sports. [17] (10.5435/jaaos-d-16-00135)
• [L2] Repeat surgery for a recurrent lumbar disc herniation was performed with good probability for improvement, although not as good as for primary lumbar disc herniation surgery, and patients undergoing repeated surgery were less satisfied. [18] (10.1007/s11999-014-3596-8)
• [L3] The data suggest that it is reasonable to operate on patients who are elderly and obese and who have lumbar symptoms, with the appropriate indications. [19] (10.1097/01.blo.0000141901.23322.98)
• [L3] We found a dose-response relationship between increasing number of previous operations and inferior outcomes among patients operated for degenerative conditions in the lumbar spine. [20] (10.1302/0301-620x.105b4.bjj-2022-0704.r1)
• [L1] This is the first comprehensive systematic review of diagnostic accuracy studies that evaluate clinical examination findings for their ability to identify the most common patho-anatomical disorders in the lumbar spine. [25] (10.1186/s12891-017-1549-6)
• [L1] [26] (10.1186/1471-2474-11-17)
• [L3] The authors suggest that DIAM implantation could be considered a useful intermediate step procedure for lumbar disc herniation surgery. [27] (10.1186/s12891-021-04929-8)
• [L3] However, among players in their 30s, lumbar degeneration was more advanced, and degenerative diseases such as discogenic pain occurred more frequently. [30] (10.1177/23259671221125513)
• [L1] For single-level lumbar discectomy, closed drainage is beneficial for reducing postoperative low-grade fever and relieving pain in the operation area in the very early postoperative stage. [31] (10.1186/s12891-020-03504-x)
• [L3] [35] (10.1186/s13018-026-06902-4)
• [L5] [37] (10.1097/01.blo.0000198724.54891.3a)
• [L4] Age is not a contraindication for decompressive lumbar spine surgery. [38] (10.1186/s13018-020-01968-0)
• [L4] Percutaneous endoscopic lumbar discectomy is a safe and efficacious technique to relieve symptoms of herniated discs and this improvement in back pain and leg symptoms translates to improvement in quality of life. [39] (10.1186/1749-799x-4-20)
• [L3] However, aggressive discectomy is associated with longer operation times and greater postoperative reductions in disc height index and Modic changes compared to limited discectomy. [43] (10.1186/s12891-024-07498-8)
• [L3] In addition, old age, severe grade of surgical-level disc degeneration and more disc degeneration levels significantly increased the incidence of complications. [44] (10.1186/s12891-021-04940-z)
• [L2] In patients with cervical radiculopathy, the type and extent of disc herniation measured on MRI prior to surgery correlated neither to the severity of the symptoms at presentation, nor to clinical outcomes at two years postoperatively. [46] (10.1302/0301-620x.104b11.bjj-2022-0657.r2)
• [L3] Given the higher reoperation risk with microendoscopic discectomy compared with microdiscectomy or open discectomy at a median of 4 years of follow-up, surgeons should select microdiscectomy or open discectomy, despite the current popularity of microendoscopic discectomy. [56] (10.1097/corr.0000000000002322)
• [L3] PELD under local anesthesia yielded remarkable improvements in pain and disability across all symptom severity groups, supporting its broader adoption with tailored risk stratification to enhance long-term success. [57] (10.1186/s13018-025-06419-2)
• [L1] There is relatively strong evidence that intraoperative epidural steroids are effective in reducing pain in the early stage and reducing consumption of analgesia. [58] (10.1186/1471-2474-15-146)
• [L1] [60] (10.1186/s12891-020-03396-x)
• [L4] [61] (10.1186/s12891-023-06148-9)
• [L1] In adults with LDH undergoing lumbar discectomy, more severe preoperative paraspinal FI is associated with recurrence or reoperation, residual/chronic low back pain, and poorer functional recovery. [68] (10.1186/s12891-026-09649-5)
• [Case_report] Although NPPE is an infrequent complication, especially in patients undergoing percutaneous endoscopic interlaminar lumbar discectomy, this case report highlights the importance of early diagnosis and prompt treatment of NPPE to prevent the development of potentially fatal complications. [69] (10.1186/s12891-018-2306-1)
• [L3] The presence and progression of these lesions are mainly attributed to lumbar disc herniation and higher hip circumference in men. [71] (10.1186/s12891-023-06379-w)
• [L3] The modified classification has good reliability and its experience level of spine surgeons does not affect the reliability. [72] (10.1186/s13018-023-03688-7)
• [L4] The average rate of return to sport for professional athletes after lumbar diskectomy was 89%. [76] (10.1177/0363546512458570)
• [L3] Patients with Modic changes had a higher incidence risk of recurrent lumbar disc herniation. [77] (10.1186/s13018-020-01695-6)
• [L2] The findings on magnetic resonance scans were not predictive of the development or duration of low-back pain. [79] (10.2106/00004623-200109000-00002)
• [L4] Modic changes, particularly Type 2, are common radiological findings in lumbar spine imaging, most frequently occurring at L4/L5 and L5/S1 levels. [80] (10.1186/s12891-025-09182-x)
• [L3] The present results suggest a general lumbar muscle dysfunction in the pain group, in particular of the deep stabilizing muscle system. [82] (10.1186/1471-2474-12-65)
• [L5] Microendoscopic discectomy and open microdiscectomy yield the same clinical outcome, but microendoscopic discectomy might result in an increased reoperation rate despite its benefits. [84] (10.1097/corr.0000000000002405)
• [L4] National Football League linemen have high return-to-play rates after lumbar diskectomy, and those requiring revision decompression also successfully return to play at high rates. [85] (10.1177/0363546510388901)
• [L3] [107] (10.2106/jbjs.n.01287)
• [L3] The effect of dural tear on in-hospital morbidity, mortality, and healthcare burdens was more significant in lumbar spinal decompression than in lumbar discectomy. [109] (10.1007/s00402-013-1843-1)
• [L4] [112] (10.1186/s12891-022-05254-4)
• [L3] [113] (10.1186/s13018-023-04484-z)
• [L1] Nevertheless, it remains a safe and effective surgical intervention for treating herniated lumbar discs in the context of obesity. [122] (10.1186/s12891-024-07455-5)
• [L4] Fully endoscopic transforaminal discectomy may be an effective and alternative treatment option for the upward migration of disc herniation in the upper lumbar area. [125] (10.3390/brainsci10060363)
• [L3] The OSE technique is an effective minimally invasive surgical option as well as the UBE technique in the treatment of L5-S1 LDH. [129] (10.1186/s13018-023-04159-9)
• [L3] [142] (10.1186/s12891-017-1522-4)
• [L3] [144] (10.1186/s12891-018-2086-7)
• [L4] Spontaneous resorption of lumbar disk herniation is a promising avenue for non-surgical management, associated with mechanisms such as inflammation, neovascularization, and macrophage infiltration. [146] (10.1186/s13018-025-05959-x)
• [L2] The objective activity tracker demonstrated that lumbar surgery results in the amount of activity decreasing 1 month just after surgery followed by gradual postoperative recovery within 3 months. [149] (10.1186/s12891-020-3102-2)
• [L2] Increased worker earnings resulting from disc herniation surgery may offset the increased direct medical costs associated with surgery. [153] (10.1007/s11999-013-3440-6)
• [L5] Adolescent lumbar disc herniation (ALDH) has a lower incidence than adult LDH but is increasing; first-line treatment remains conservative, while surgery, particularly spinal endoscopic operation, is reserved for cases where conservative treatment is unsatisfactory. [154] (10.1186/s13018-025-06024-3)
• [L4] [161] (10.1186/s12891-021-04548-3)
• [L3] The device is efficient and safe for PTED in treating lumbar disc herniation at the L5–S1 level. [167] (10.1186/s13018-021-02533-z)
• [L4] [168] (10.1186/s13018-023-04226-1)
• [L4] [170] (10.5435/jaaosglobal-d-23-00161)
• [Paper] [171] (10.1055/s-0031-1287774)
• [L1] A positive MRI T2-weighted image of the lumbar disc with HIZ indicates disc degeneration and may be a specific indicator for the physical diagnosis of discogenic low back pain. [174] (10.1186/s13018-023-04187-5)
• [L3] However, it is crucial to meticulously evaluate the indications due to potential risks associated with this form of anesthesia. [184] (10.1186/s12891-024-07898-w)
• [L3] Using the 4-grade fat infiltration system to determine the level of fat infiltration in the paraspinal muscles is more effective in predicting lumbar disc herniation compared to the 3-grade system. [185] (10.1186/s13018-023-04247-w)
• [L4] Gradient local anesthesia can satisfactorily and safely control intraoperative pain during the PELD via the interlaminar approach. [186] (10.1186/s13018-020-01939-5)
• [L3] The 4-grade fat infiltration system was seen to be more effective than the 3-grade fat infiltration system in the determination of the level of fat infiltration in the paraspinal muscles and the prediction of lumbar disc herniation. [187] (10.1186/s12891-022-05180-5)
• [L4] The Song's classification system has initially demonstrated significant value in guiding personalized surgical decision-making. [188] (10.1186/s13018-025-06342-6)
• [L4] Despite the minimally invasiveness and high visualization capabilities of biportal endoscopy, patients who are diabetic, smoker, or contained disk herniation on MRI should be counseled for higher risk of recurrence. [190] (10.5435/jaaosglobal-d-25-00137)
• [L1] Epidural injection of dexamethasone and VB12 effectively reduces early postoperative low back and leg pain, lowers postoperative inflammatory factor expression, and improves early PEID outcomes. [192] (10.1186/s13018-024-05210-z)
• [L2] The use of a new body surface-assisting puncture device in percutaneous transforaminal endoscopic lumbar discectomy surgery can significantly reduce the number of punctures and X-ray fluoroscopy radiation dose, as well as shortening the operation time, without increasing surgical complications. [194] (10.1186/s12891-022-05985-4)
• [L3] Compared with the OD group, the PELD group showed higher reoperation rates and lower infection rates. [197] (10.1302/0301-620x.103b8.bjj-2020-2541.r2)
• [L3] Full endoscopic lumbar discectomy combined with annulus fibrosus repair reduces the postoperative recurrence rate and achieves satisfactory clinical outcomes. [198] (10.1186/s13018-024-04725-9)

See Also

• Lumbar disc herniation
• Low back pain
• Lumbar spinal stenosis
• Sciatica
• Cauda equina syndrome
• Cervical radiculopathy

References

[1] Lumbar microdiscectomy and post-operative activity restrictions: a protocol for a single blinded randomised controlled trial. BMC Musculoskeletal Disorders. 2017. DOI: 10.1186/s12891-017-1681-3

[2] Correction to: Physical prognostic factors predicting outcome following lumbar discectomy surgery: systematic review and narrative synthesis. BMC Musculoskeletal Disorders. 2018. DOI: 10.1186/s12891-018-2288-z

[3] Percutaneous lumbar discectomy. Preoperative and postoperative magnetic resonance imaging.. The Journal of Bone & Joint Surgery. 1995. DOI: 10.2106/00004623-199504000-00011

[5] Recurrent Lumbar Disk Herniation. American Academy of Orthopaedic Surgeon. 2010. DOI: 10.5435/00124635-201006000-00005

[6] Long-Term Outcome of Lumbar Discectomy in Children and Adolescents Sixteen Years of Age or Younger. The Journal of Bone & Joint Surgery*. 1998. DOI: 10.2106/00004623-199805000-00009

[7] A comparative study of the outcomes of primary and revision lumbar discectomy surgery. The Bone & Joint Journal. 2013. DOI: 10.1302/0301-620x.95b1.30413

[8] Additional operations after surgery for lumbar disc prolapse. The Bone & Joint Journal. 2022. DOI: 10.1302/0301-620x.104b5.bjj-2021-1706.r2

[9] Performance-Based Outcomes Following Lumbar Discectomy in Professional Athletes in the National Football League. Spine. 2010. DOI: 10.1097/brs.0b013e3181bf8bb5

[10] Randomized Controlled Trials of the Treatment of Lumbar Disk Herniation: 1983-2007. Journal of the American Academy of Orthopaedic Surgeons. 2008. DOI: 10.5435/00124635-200810000-00002

[11] Return to Play After Lumbar Spine Surgery. Clinics in Sports Medicine. 2016. DOI: 10.1016/j.csm.2016.05.006

[12] Opioid Prescribing Trends Following Lumbar Discectomy. Journal of the American Academy of Orthopaedic Surgeons. 2024. DOI: 10.5435/jaaos-d-24-00908

[13] Lumbar Spine Injuries in Recreational Athletes: A Review. Journal of the American Academy of Orthopaedic Surgeons. 2025. DOI: 10.5435/jaaos-d-24-00979

[14] Recurrent Lumbar Disk Herniation and Revision Surgery Rates After Single-Level Lumbar Microdiscectomy in the Military Population. Journal of the American Academy of Orthopaedic Surgeons. 2024. DOI: 10.5435/jaaos-d-24-00879

[15] Characteristics of relief and residual low back pain after discectomy in patients with lumbar disc herniation: analysis using a detailed visual analog scale. BMC Musculoskeletal Disorders. 2021. DOI: 10.1186/s12891-021-04015-z

[16] Comparing the efficacy and safety of biportal endoscopic discectomy with microscopic discectomy for lumbar herniated intervertebral disc: a multicentre, prospective, assessor-blinded, randomized controlled trial. The Bone & Joint Journal. 2025. DOI: 10.1302/0301-620x.107b5.bjj-2024-1560.r1

[17] Management of Lumbar Conditions in the Elite Athlete. Journal of the American Academy of Orthopaedic Surgeons. 2017. DOI: 10.5435/jaaos-d-16-00135

[18] Recurrent Versus Primary Lumbar Disc Herniation Surgery: Patient-reported Outcomes in the Swedish Spine Register Swespine. Clinical Orthopaedics & Related Research. 2015. DOI: 10.1007/s11999-014-3596-8

[19] Does Obesity Affect the Results of Lumbar Decompressive Spinal Surgery in the Elderly?. Clinical Orthopaedics and Related Research. 2004. DOI: 10.1097/01.blo.0000141901.23322.98

[20] Impact of the number of previous lumbar operations on patient-reported outcomes after surgery for lumbar spinal stenosis or lumbar disc herniation. The Bone & Joint Journal. 2023. DOI: 10.1302/0301-620x.105b4.bjj-2022-0704.r1

[25] Clinical classification in low back pain: best-evidence diagnostic rules based on systematic reviews. BMC Musculoskeletal Disorders. 2017. DOI: 10.1186/s12891-017-1549-6

[26] Function after spinal treatment, exercise and rehabilitation (FASTER): improving the functional outcome of spinal surgery. BMC Musculoskeletal Disorders. 2010. DOI: 10.1186/1471-2474-11-17

[27] 15-year survivorship analysis of an interspinous device in surgery for single-level lumbar disc herniation. BMC Musculoskeletal Disorders. 2021. DOI: 10.1186/s12891-021-04929-8

[30] Low Back Pain and Lumbar Degeneration in Japanese Professional Baseball Players. Orthopaedic Journal of Sports Medicine. 2022. DOI: 10.1177/23259671221125513

[31] Closed drainage versus non-drainage for single-level lumbar discectomy: a prospective randomized controlled study. BMC Musculoskeletal Disorders. 2020. DOI: 10.1186/s12891-020-03504-x

[33] Campbell S Operative Orthopaedics 4 Volume Set. OVERVIEW OF LUMBAR AND THORACIC DISC DEGENERATION AND HERNIATION > REPEAT LUMBAR DISC SURGERY.

[35] A novel transparent visual channel translates into enhanced surgical safety and efficiency for prolapsed lumbar disc herniation: a comparative clinical study. Journal of Orthopaedic Surgery and Research. 2026. DOI: 10.1186/s13018-026-06902-4

[37] Lumbar Disc Herniations. Clinical Orthopaedics & Related Research. 2006. DOI: 10.1097/01.blo.0000198724.54891.3a

[38] Linical efficacy of percutaneous endoscopic lumbar discectomy for the treatment of lumbar spinal stenosis in elderly patients: a retrospective study. Journal of Orthopaedic Surgery and Research. 2020. DOI: 10.1186/s13018-020-01968-0

[39] Percutaneous endoscopic lumbar discectomy: clinical and quality of life outcomes with a minimum 2 year follow-up. Journal of Orthopaedic Surgery and Research. 2009. DOI: 10.1186/1749-799x-4-20

[41] Miller S Review Of Orthopaedics. SECTION 16 PATELLAR TRACKING IN TOTAL KNEE ARTHROPLASTY > LUMBAR SPINE > 2. Discogenic back pain.

[43] Limited discectomy versus aggressive discectomy by spinal endoscopy with the transforaminal approach for lumbar disc herniation: a retrospective study. BMC Musculoskeletal Disorders. 2024. DOI: 10.1186/s12891-024-07498-8

[44] Complications and risk factors of percutaneous endoscopic transforaminal discectomy in the treatment of lumbar spinal stenosis. BMC Musculoskeletal Disorders. 2021. DOI: 10.1186/s12891-021-04940-z

[46] The type of cervical disc herniation on MRI does not correlate to clinical outcomes. The Bone & Joint Journal. 2022. DOI: 10.1302/0301-620x.104b11.bjj-2022-0657.r2

[52] Aaos Comprehensive Orthopaedic Review 3. Lumbar Degenerative Disease and Low Back Pain > VI. Lumbar Stenosis.

[55] Campbell S Operative Orthopaedics 4 Volume Set. OVERVIEW OF LUMBAR AND THORACIC DISC DEGENERATION AND HERNIATION > DEGENERATIVE DISC DISEASE AND INTERNAL DISC DERANGEMENT.

[56] Reoperation Rates of Microendoscopic Discectomy Compared With Conventional Open Lumbar Discectomy: A Large-database Study. Clinical Orthopaedics & Related Research. 2022. DOI: 10.1097/corr.0000000000002322

[57] Advancing lumbar disc herniation treatment: a prospective study on the efficacy and safety of percutaneous endoscopic lumbar discectomy under local anesthesia, across symptom severity. Journal of Orthopaedic Surgery and Research. 2025. DOI: 10.1186/s13018-025-06419-2

[58] Efficacy of intraoperative epidural steroids in lumbar discectomy: a systematic review. BMC Musculoskeletal Disorders. 2014. DOI: 10.1186/1471-2474-15-146

[60] Open fenestration discectomy versus microscopic fenestration discectomy for lumbar disc herniation: a randomized controlled trial. BMC Musculoskeletal Disorders. 2020. DOI: 10.1186/s12891-020-03396-x

[61] Clinical efficacy of transforaminal endoscopic discectomy in the treatment of recurrent lumbar disc herniation: a single-center retrospective analysis. BMC Musculoskeletal Disorders. 2023. DOI: 10.1186/s12891-023-06148-9

[64] Orthopaedic Knowledge Update 13 Ebook Without Multimedia. Thoracolumbar Conditions > Annotated References.

[66] Campbell S Operative Orthopaedics 4 Volume Set. POSTERIOR APPROACH TO THE LUMBAR SPINE, L1 TO L5 > NATURAL HISTORY OF DISC DISEASE.

[68] Preoperative paraspinal muscle fatty infiltration and prognosis after lumbar discectomy for disc herniation: a systematic review and meta-analysis. BMC Musculoskeletal Disorders. 2026. DOI: 10.1186/s12891-026-09649-5

[69] Negative pressure pulmonary edema after percutaneous endoscopic interlaminar lumbar discectomy-a case report. BMC Musculoskeletal Disorders. 2018. DOI: 10.1186/s12891-018-2306-1

[71] The lumbar spinal endplate lesions grades and association with lumbar disc disorders, and lumbar bone mineral density in a middle-young general Chinese population. BMC Musculoskeletal Disorders. 2023. DOI: 10.1186/s12891-023-06379-w

[72] Independent reliability and availability analyses of modified classification for migrated lumbar disc herniation. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-03688-7

[76] Return-to-Play Outcomes After Microscopic Lumbar Diskectomy in Professional Athletes. The American Journal of Sports Medicine. 2012. DOI: 10.1177/0363546512458570

[77] Recurrent disc herniation following percutaneous endoscopic lumbar discectomy preferentially occurs when Modic changes are present. Journal of Orthopaedic Surgery and Research. 2020. DOI: 10.1186/s13018-020-01695-6

[79] The Value of Magnetic Resonance Imaging of the Lumbar Spine to Predict Low-Back Pain in Asymptomatic Subjects. The Journal of Bone and Joint Surgery-American Volume. 2001. DOI: 10.2106/00004623-200109000-00002

[80] Prevalence of modic changes in patients with low back pain and association with degenerative spinal findings: a retrospective MRI study. BMC Musculoskeletal Disorders. 2025. DOI: 10.1186/s12891-025-09182-x

[82] Computed tomographic analysis of the quality of trunk muscles in asymptomatic and symptomatic lumbar discectomy patients. BMC Musculoskeletal Disorders. 2011. DOI: 10.1186/1471-2474-12-65

[84] CORR Insights®: Reoperation Rates of Microendoscopic Discectomy Compared With Conventional Open Lumbar Discectomy: A Large-database Study. Clinical Orthopaedics & Related Research. 2022. DOI: 10.1097/corr.0000000000002405

[85] Return-to-Play Rates in National Football League Linemen After Treatment for Lumbar Disk Herniation. The American Journal of Sports Medicine. 2011. DOI: 10.1177/0363546510388901

[91] Campbell S Operative Orthopaedics 4 Volume Set. OVERVIEW OF LUMBAR AND THORACIC DISC DEGENERATION AND HERNIATION > STENOSIS OF THE THORACIC AND LUMBAR SPINE > ANATOMY.

[92] Campbell S Operative Orthopaedics 4 Volume Set. OVERVIEW OF LUMBAR AND THORACIC DISC DEGENERATION AND HERNIATION > DISC AND SPINE ANATOMY > NEURAL ELEMENTS.

[93] Orthopaedic Basic Science Fifth Edition Print Ebook. Lumbar Spondylosis, Degenerative Disk Disease, and Radiculopathy > Introduction.

[95] Orthopaedic Knowledge Update 13 Ebook Without Multimedia. Spinal Anatomy > Osseous Anatomy > Lumbar Vertebrae.

[96] Campbell S Operative Orthopaedics 4 Volume Set. POSTERIOR APPROACH TO THE LUMBAR SPINE, L1 TO L5 > NEURAL ELEMENTS.

[98] Orthopaedic Basic Science Fifth Edition Print Ebook. Lumbar Spondylosis, Degenerative Disk Disease, and Radiculopathy > Lumbar Degenerative Disk.

[101] Campbell S Operative Orthopaedics 4 Volume Set. OVERVIEW OF LUMBAR AND THORACIC DISC DEGENERATION AND HERNIATION > MAGNETIC RESONANCE IMAGING.

[107] Risk Factors for Reoperation in Patients Treated Surgically for Intervertebral Disc Herniation. Journal of Bone and Joint Surgery. 2015. DOI: 10.2106/jbjs.n.01287

[108] Campbell S Operative Orthopaedics 4 Volume Set. POSTERIOR APPROACH TO THE LUMBAR SPINE, L1 TO L5 > DIAGNOSTIC STUDIES.

[109] Incidental dural tear in lumbar spinal decompression and discectomy: analysis of a nationwide database. Archives of Orthopaedic and Trauma Surgery. 2013. DOI: 10.1007/s00402-013-1843-1

[112] Full-endoscopic foraminoplasty for highly down-migrated lumbar disc herniation. BMC Musculoskeletal Disorders. 2022. DOI: 10.1186/s12891-022-05254-4

[113] Comparison of clinical outcomes between unilateral biportal endoscopic discectomy and percutaneous endoscopic interlaminar discectomy for migrated lumbar disc herniation at lower lumbar spine: a retrospective controlled study. Journal of Orthopaedic Surgery and Research. 2024. DOI: 10.1186/s13018-023-04484-z

[122] Comparative outcomes of obese and non-obese patients with lumbar disc herniation receiving full endoscopic transforaminal discectomy: a systematic review and meta-analysis. BMC Musculoskeletal Disorders. 2024. DOI: 10.1186/s12891-024-07455-5

[123] Orthopaedic Basic Science Fifth Edition Print Ebook. Lumbar Spondylosis, Degenerative Disk Disease, and Radiculopathy > Proinflammatory Response With Vertebral Osteoarthritis.

[124] Campbell S Operative Orthopaedics 4 Volume Set. OVERVIEW OF LUMBAR AND THORACIC DISC DEGENERATION AND HERNIATION > TREATMENT RESULTS.

[125] Fully Endoscopic Transforaminal Lumbar Discectomy for Upward Migration of Upper Lumbar Disc Herniation: Clinical and Radiological Outcomes and Technical Considerations. Brain Sciences. 2020. DOI: 10.3390/brainsci10060363

[129] One-hole split endoscopy technique versus unilateral biportal endoscopy technique for L5-S1 lumbar disk herniation: analysis of clinical and radiologic outcomes. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-04159-9

[131] Orthopaedic Knowledge Update Sports Medicine 6. Thoracolumbar Spine > Summary.

[133] Campbell S Operative Orthopaedics 4 Volume Set. OVERVIEW OF LUMBAR AND THORACIC DISC DEGENERATION AND HERNIATION > THORACIC ENDOSCOPIC DISC EXCISION.

[138] Aaos Comprehensive Orthopaedic Review 3. Lumbar Degenerative Disease and Low Back Pain > V. Disk Herniations/Herniated Nucleus Pulposus.

[139] Orthopaedic Knowledge Update Sports Medicine 6. Thoracolumbar Spine > History and Physical Examination.

[142] Correlation between intervertebral disc degeneration, paraspinal muscle atrophy, and lumbar facet joints degeneration in patients with lumbar disc herniation. BMC Musculoskeletal Disorders. 2017. DOI: 10.1186/s12891-017-1522-4

[144] Morphology of intervertebral disc ruptures evaluated by vacuum phenomenon using multi-detector computed tomography: association with lumbar disc degeneration and canal stenosis. BMC Musculoskeletal Disorders. 2018. DOI: 10.1186/s12891-018-2086-7

[146] Mechanisms and management of self-resolving lumbar disc herniation: bridging molecular pathways to non-surgical clinical success. Journal of Orthopaedic Surgery and Research. 2025. DOI: 10.1186/s13018-025-05959-x

[149] Objective evaluation of postoperative changes in real-life activity levels in the postoperative course of lumbar spinal surgery using wearable trackers. BMC Musculoskeletal Disorders. 2020. DOI: 10.1186/s12891-020-3102-2

[153] How Does Accounting for Worker Productivity Affect the Measured Cost-Effectiveness of Lumbar Discectomy?. Clinical Orthopaedics & Related Research. 2014. DOI: 10.1007/s11999-013-3440-6

[154] Adolescent lumbar disc herniation: etiology, diagnosis, and treatment options. Journal of Orthopaedic Surgery and Research. 2025. DOI: 10.1186/s13018-025-06024-3

[161] A novel vertebral trench technique (VTT) involving transforaminal endoscopic lumbar foraminotomy (TELF) for very highly up-migrated lumbar disc herniation above L5. BMC Musculoskeletal Disorders. 2021. DOI: 10.1186/s12891-021-04548-3

[167] Application of a targeted and quantificational foraminoplasty device in percutaneous transforaminal endoscopic discectomy for L5–S1 disc herniation: preliminary clinical outcomes. Journal of Orthopaedic Surgery and Research. 2021. DOI: 10.1186/s13018-021-02533-z

[168] Minimally invasive tubular microdiscectomy for recurrent lumbar disc herniation: step-by-step technical description with safe scar dissection. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-04226-1

[170] Biportal Endoscopic Spine Surgery for Lumbar Laminectomy and Diskectomy: Postoperative Outcomes and Surgical Learning Curve, a Single US Surgeon's Experience. JAAOS: Global Research and Reviews. 2024. DOI: 10.5435/jaaosglobal-d-23-00161

[171] Prevention of Development of Postoperative Dysesthesia in Transforaminal Percutaneous Endoscopic Lumbar Discectomy for Intracanalicular Lumbar Disc Herniation: Floating Retraction Technique. min - Minimally Invasive Neurosurgery. 2011. DOI: 10.1055/s-0031-1287774

[174] The correlation between the lumbar disc MRI high-intensity zone and discogenic low back pain: a systematic review and meta-analysis. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-04187-5

[184] Comparison of spinal anesthesia and local anesthesia in percutaneous interlaminar endoscopic lumbar discectomy for L5/S1 disc herniation: a retrospective cohort study. BMC Musculoskeletal Disorders. 2024. DOI: 10.1186/s12891-024-07898-w

[185] Enhanced grading methods for lumbar paraspinal fat infiltration and its prognostic value in predicting lumbar disc herniation. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-04247-w

[186] Gradient local anesthesia for percutaneous endoscopic interlaminar discectomy at the L5/S1 level: a feasibility study. Journal of Orthopaedic Surgery and Research. 2020. DOI: 10.1186/s13018-020-01939-5

[187] An evaluation of the efficacy of a four-grade fat infiltration classification method, presented for the first time in literature. BMC Musculoskeletal Disorders. 2022. DOI: 10.1186/s12891-022-05180-5

[188] A novel classification and clinical evaluation of various morphologies of calcified lumbar disc herniation treated using unilateral biportal endoscopic technique. Journal of Orthopaedic Surgery and Research. 2025. DOI: 10.1186/s13018-025-06342-6

[190] Risk Factors for Recurrent Disk Herniation After Biportal Endoscopic Diskectomy. JAAOS: Global Research and Reviews. 2026. DOI: 10.5435/jaaosglobal-d-25-00137

[192] Effects of dexamethasone combined with vitamin B12 on percutaneous endoscopic interlaminar discectomy early outcomes: a randomized controlled trial. Journal of Orthopaedic Surgery and Research. 2024. DOI: 10.1186/s13018-024-05210-z

[194] Application of a new body surface-assisting puncture device in percutaneous transforaminal endoscopic lumbar discectomy. BMC Musculoskeletal Disorders. 2022. DOI: 10.1186/s12891-022-05985-4

[197] Risk of reoperation and infection after percutaneous endoscopic lumbar discectomy and open lumbar discectomy. The Bone & Joint Journal. 2021. DOI: 10.1302/0301-620x.103b8.bjj-2020-2541.r2

[198] Clinical effect of full endoscopic lumbar annulus fibrosus suture. Journal of Orthopaedic Surgery and Research. 2024. DOI: 10.1186/s13018-024-04725-9