Spinal Anatomy & Physiology

Lumbar spinal anatomy and biomechanics, focusing on neuroforaminal and central canal dimensions and the drivers of degenerative stenosis.

Overview

Spinal deformities and disorders require a tailored approach grounded in precise anatomical assessment and imaging. A novel rabbit model of angular kyphosis provides a reliable platform for investigating pathophysiology and evaluating interventions [1]. Effective management relies on understanding the specific indications, advantages, and disadvantages of radiographs, CT, MRI, and other techniques [2]. Comprehensive evaluation includes data on bone density of the cervical, thoracic, and lumbar spine measured using Hounsfield units of computed tomography from 4350 vertebrae, which aids in assessing spinal status and designing preoperative plans before instrumentation [56].

Clinical management of thoracolumbar and lumbosacral pain is highly individualized based on pathology, symptomatic involvement, and the patient's physical demands [4]. Nonsurgical treatment usually serves as the first line of therapy [4]. Physical examination encompasses inspection, palpation, range of motion testing, and neurologic evaluation to identify spinal pathology, nonspinal conditions, and signs of symptom magnification [5]. Absolute surgical indications for disc herniation include deteriorating neurological deficits with myelopathy or cauda equina syndrome [22].

Surgeons must account for anatomical variations, such as the differing rates of presence of 11 thoracic and 6 lumbar vertebrae in asymptomatic Chinese adult volunteers, when performing surgery or assessing alignment parameters [61]. Standard positioning for Cobb angle radiographic measurements is recommended to avoid technical causes for the appearance of a curve [26]. While various stereophotogrammetric protocols exist to quantify multi-segmental motion of the thoracolumbar spine, no standard guideline exists and these approaches remain limited from a clinical point of view [23]. Finally, protocols in place at centers minimize the risk of spinal cord ischemia during planned sacrifice of radiculomedullary vessels, though elucidation of exact compensation mechanisms requires further study via comparative angiography [60]. A 1957 report on mechanical tests of the lumbosacral spine remains a preliminary report without clinical conclusions regarding outcomes or efficacy [14].

Anatomy & Pathophysiology

The spine's unique bony, ligamentous, neural, and vascular anatomy facilitates multiple biologic and biomechanical functions, providing axial support with significant flexibility while protecting neural structures [30]. Su's three-column theory aligns with the characteristics of vertebral physiological structure, fracture patterns, and biomechanics [48]. Critical spinal lytic defects result in kinematic abnormalities and lower the compressive strength of the spine [62].

Geometric deformations of the lumbar disc occur during axial body rotations [38], and load-displacement curves of the human lumbar and lumbosacral spine are non-linear [66]. Motions of the human lumbar and lumbosacral spine are coupled [66], with increasing load significantly impacting the coupled translational movement of lumbar facet joints [54]. The position of the lumbar spine center of rotation changes with variations in load and differs between movement types [21], while distinct motion patterns exist in the lower lumbar spine [21]. Individual kinematic variables and lumbar lordosis have weak to moderate effects on intervertebral range of motion at other intervertebral levels [65].

Global lumbar spine kinematics do not reflect regional lumbar spine kinematics [16], and pelvic, trunk, and upper limb biomechanics in individuals with spinal deformities are complex [57]. Lumbosacral and hip motions are the major contributors to global alignment postural change [58]. With advancing age, spinopelvic biomechanics demonstrate decreased spinal mobility but increased pelvic and hip mobility [51]. Changes in lumbar-stabilizing mechanisms in the presence of muscle fatigue seem to be caused by modulation of lumbopelvic kinematics [59]. Higher values of ligament stiffness over all lumbar levels could lead to a shift of the loading and the motion between segments to the lower lumbar levels [73].

Loading in the anterior-oblique direction requires lower external force or moment to keep the lumbar spine in the neutral position compared to vertical or posterior-oblique directions [70]. Understanding the biomechanical principles of spinal instrumentation and motion coupling is essential for optimizing three-dimensional correction of thoracolumbar spinal deformities and achieving favorable mechanical environments for fusion [52]. Spine balance can alter total hip arthroplasty outcomes [72]. Currently available wearable devices are capable of assessing spinal posture with good accuracy in the clinical setting [18].

Classification

Roussouly-based Axis: The T4-L1-Hip axis is conceptually aligned with the description of spinal shapes in the Roussouly classification but utilizes continuous measures of spinal alignment [53].

Degenerative Thoracolumbar Kyphosis: A novel classification for degenerative thoracolumbar kyphosis proposes four types based on thoracolumbar kyphosis and balance, followed by targeted treatment strategies for various types [64].

Hip-Spine Classification: The Hip-Spine Classification system allows surgeons to make appropriate evaluations preoperatively and guides the use of dual-mobility components in patients with spinopelvic pathology to reduce the risk of dislocation [49].

Other Considerations: No existing prognostic classification system can predict which patients with a congenital osseous anomaly of the cervical spine are at risk for future neurologic injury [43]. Further analysis by an expert panel is required to develop specific classification criteria for thoracolumbar fascia [50]. Distal radius bone mineral density has the potential to be integrated into future osteoporosis classification systems [67]. There is a need for consistent nomenclature, advanced imaging, and the integration of artificial intelligence to personalize care based on individual anatomy and biomechanics [80].

Clinical Presentation

Clinical evaluation begins with a comprehensive history and physical examination to distinguish spinal pathology from nonspinal conditions and identify signs of symptom magnification [5]. General principles include inspection, palpation, range of motion testing, and neurologic evaluation. While understanding the indications, advantages, and disadvantages of radiographs, CT, and MRI is critical for safe management [2], imaging findings must be interpreted cautiously. Roentgenographic abnormalities in asymptomatic individuals represent imaging findings only, and clinical decisions regarding thoracic spine pain usually require additional studies [12]. Furthermore, MRI findings are not predictive of the development or duration of low-back pain in asymptomatic subjects [7], and few MRI findings show large magnitude associations with chronic low back pain or radicular symptoms even with specific outcome definitions [3].

Imaging Modalities: MRI is a non-invasive, high-resolution, multiplanar modality essential for evaluating the cervical spine spectrum, providing detailed visualization of osseous structures, discs, the spinal cord, and nerve roots [17]. It is also an excellent modality for imaging pathologic processes in the pediatric spine [19]. Wearable devices are currently capable of assessing spinal posture with good accuracy in the clinical setting [18]. Accessory ossicles exhibit varied prevalence and clinical significance, with some presenting minor associations with symptoms and others linked to specific syndromes or disorders [36]. A unique neural arch shape may clarify the pathophysiology of degenerative spondylolisthesis and explain its greater prevalence in females [13].

Red-Flag Patterns and Urgent Management: When cauda equina syndrome is diagnosed, urgent surgical decompression of the spinal canal is indicated regardless of the setting [37]. Early investigation is warranted for cervical vertebral anomalies associated with intermittent and significant pain [39]. Treatment for anomalies of the occipitocervical articulation depends on symptom severity and neurological involvement; fusion is indicated for instability causing cord compression, while laminectomy or foramen magnum enlargement may be necessary for compression [40]. In idiopathic scoliosis, pushing conditions warrant attention to the lower spinal cord and nerve roots on both sides of the main thoracic curve [41].

Pathophysiology and Management Principles: A novel rabbit model of angular kyphosis provides a reliable platform for investigating spinal deformity pathophysiology and evaluating therapeutic interventions [1]. Management of thoracolumbar and lumbosacral spine-related pain is highly individualized based on pathology, symptomatic involvement, and patient activity demands, with nonsurgical treatment usually serving as the first line of therapy [4]. The monograph on cervical syndrome presents contradictory conceptions regarding pathogenesis, diagnosis, and treatment, though there is general agreement on the role of intervertebral foramina in nerve-root irritation and the significance of the cervical sympathetic nervous system [15]. Specialty updates review high-quality research to support treatment decision-making across cervical and lumbar conditions, deformity, cord injury, and trauma [20].

Investigations

Plain radiography: While specific indications for radiographs vary by pathology, an understanding of their advantages and disadvantages relative to other modalities is critical for the safe and effective management of spinal disorders [2].

MRI: Magnetic resonance imaging is a non-invasive, high-resolution, multiplanar modality essential for evaluating the spectrum of cervical spinal disease, providing detailed visualization of osseous and soft-tissue structures including intervertebral discs, the spinal cord, and nerve roots [17]. It is also an excellent modality for imaging pathologic processes in the pediatric spine with high-resolution views of osseous and soft-tissue structures [19]. In the cervical region, a comprehensive reference source exists on the use of MRI and CT for scanning the entire spine [63]. A progression of degenerative changes on cervical MRI was detected in nearly all subjects over a 20-year period [31]. MR images can distinguish histological structures of normal and malformed mouse spines, where malformed vertebrae were accompanied by adjacent intervertebral structures corresponding to fully segmented structures in human congenital scoliosis, though intervertebral conditions varied [68]. Specialized pulse sequences and imaging techniques are defined for evaluating the spine, characterizing the three compartments for spinal tumor classification and providing knowledge of common spinal tumors [77]. The proposed method offers an option for quantifying cervical spine muscle composition and morphology using MRI [78]. Performing both quantitative T2 relaxation time and magnetic transfer ratio imaging under the same conditions is helpful in evaluating disc degeneration [69]. A prospective longitudinal trial on spinal cord motion as a new diagnostic MRI parameter will offer data to establish PC-MRI for spinal cord motion in the diagnostic work-up of patients with spinal canal stenosis [82]. However, few MRI findings showed large magnitude associations with symptom outcomes even with specific definitions for spine-related symptom outcomes [3]. Findings on magnetic resonance scans were not predictive of the development or duration of low-back pain [7]. Findings on MRI of the thoracic spine represent roentgenographic abnormalities only, and clinical decisions concerning thoracic spine pain treatment usually require additional studies [12]. A routine MRI evaluation appears warranted for patients with presumed idiopathic scoliosis if aged less than 10 years, being male, or having a left thoracic or right lumbar curve [74]. The investigation represents the best available evidence regarding the radiographic and clinical natural history of cervical degeneration, with data that will critically influence discussions with patients regarding their MRI findings [11].

CT: Lumbar HR-MDCT is not valid for the in vivo evaluation of bone architecture in the lumbar spine as there was no significant correlation between HR-MDCT and micro-CT analysis of vertebral biopsies [81].

Other Considerations: A novel rabbit model of angular kyphosis provides a reliable platform for investigating the pathophysiology of spinal deformities and evaluating therapeutic interventions [1]. Due to the unique microarchitecture of the cervical vertebrae, fractures occur much later in this region than in the thoracic or lumbar spine [10]. Imaging studies should be used to confirm the clinical impression derived from history and physical examination, with careful correlation of anatomic abnormalities to symptoms, and advanced neurodiagnostic imaging should be refrained from until appropriate nonoperative management has failed [83].

Treatment

Non-Operative

Nonsurgical treatment serves as the first line of therapy for thoracolumbar and lumbosacral spine-related pain, with management highly individualized based on pathology, symptomatic involvement, and the patient's activity or physical demands [4]. For acute low back pain, individualized administration route preference-matched treatment improves therapeutic outcomes, though further studies with larger cohorts are needed to confirm this benefit [47]. Management of low back pain and pelvic girdle pain in pregnancy ranges from conservative and pharmacologic measures to surgical treatment, often requiring a collaborative plan between orthopaedic surgeons and obstetricians [87]. Treatment for separation of the symphysis pubis in association with childbearing is generally non-operative, with surgery reserved for inadequate reduction or persistent symptoms [86]. High-quality studies targeting non-surgical treatment as an evidence-based alternative to surgical interventions for conditions related to excessive anterior pelvic tilt are warranted [89].

Operative

Indications: Absolute surgical indications for disc herniation include deteriorating neurological deficits with myelopathy or cauda equina syndrome [22]. Spinal anesthesia by mini-laminotomy should be considered for patients in whom general anesthesia is contraindicated and neuraxial anesthesia is extremely difficult, such as patients with ankylosing spondylitis [79].

Surgical Approach / Technique: Percutaneous spinal endoscopy with a unilateral interlaminar approach to perform bilateral decompression for central lumbar spinal stenosis demonstrated good clinical and radiographic efficacies in short-term follow-up [9]. This approach did not cause meaningful changes in IHI, CDS, and spine stability in short-term follow-up [9]. Instrumentation should never extend beyond the contralateral intervertebral disc border, regardless of presumed vascular anatomy, during oblique lumbar interbody fusion [75].

Implant Selection: A 3D-printed porous stand-alone interbody cage for cervical fusion is safe and effective for cervical fixation, showing no adverse effects on the cervical spine or animal bodies [46]. This cage demonstrates equivalent fixation and healing capabilities compared to control devices [46].

Adjuncts: Recent advances in cervical spinal cord stimulation have demonstrated improved efficacy as a therapeutic intervention for restoring hand functions in individuals with spinal cord injuries or stroke [45]. Cervical spinal cord stimulation yields significant improvements in grip force, proximal arm strength, and muscle activation with both immediate and sustained effects [45]. Advances in medical care and rehabilitation continue to improve, but treatment outcomes following tissue regeneration for spinal cord injury remain dismal [6].

Other Considerations: A novel rabbit model of angular kyphosis provides a reliable platform for investigating the pathophysiology of spinal deformities and evaluating therapeutic interventions [1]. An understanding of available spine imaging modalities is critical to safely and effectively manage spinal disorders, with specific indications, advantages, and disadvantages for radiographs, CT, MRI, and other techniques depending on the pathology [2]. Utilizing standard positioning for Cobb angle radiographic measurements is recommended to avoid technical causes for the appearance of a curve [26]. Results from 3D markerless asymmetry analysis lead to a more conservative approach in monitoring of scoliotic curves in clinical applications [85]. Using 3D markerless asymmetry analysis in the management of adolescent idiopathic scoliosis would result in a smaller number of radiographs being saved [85]. Using 3D markerless asymmetry analysis in the management of adolescent idiopathic scoliosis would decrease the risk of having non-measured curves with progression [85]. Improved spinal morphology of postsurgical adolescent idiopathic scoliosis (AIS) patients has no significant impact on their static standing balance [8]. Six months of spinal growth modulation created significant spinal deformity in all three planes compared with sham-surgery controls [88]. The paper on mechanical tests of the lumbosacral spine does not provide a clinical conclusion regarding patient outcomes or treatment efficacy [14]. The literature offers various stereophotogrammetric protocols to quantify multi-segmental motion of the thoracolumbar spine without a standard guideline, and approaches remain limited from a clinical point of view [23]. A range of wearable technologies and biofeedback modalities are used to modulate spine motor control, though standardized reporting and further research are needed to establish clinical efficacy [42]. Specialty updates review the highest-quality peer-reviewed research in spinal conditions to support treatment decision-making for cervical and lumbar spine conditions, pediatric and adult spinal deformity, spinal cord injury, and spinal fracture and trauma [20].

Complications

Instability: While percutaneous spinal endoscopy with a unilateral interlaminar approach for central lumbar spinal stenosis did not cause meaningful changes in IHI, CDS, or spine stability in short-term follow-up [9], the extent of inferior articular process (IAP) resection is critical. In the short term, patients with > 50% IAP defects show no difference in lumbar stability or clinical outcomes compared to those with ≤ 50% defects after percutaneous endoscopic interlaminar lumbar discectomy [25]; however, complete loss of the inferior articular process remains a concern for long-term instability [25]. Additionally, fractures occur much later in the cervical vertebrae than in the thoracic or lumbar spine due to the unique microarchitecture of the cervical vertebrae [10].

Neurological & Clinical Progression: Most patients with cervical spondylotic myelopathy become worse clinically if the disorder is left untreated, with more than 50 percent progressing to severe disability [34]. Despite advances in medical care and rehabilitation, treatment outcomes following tissue regeneration for spinal cord injury remain dismal [6]. Although major abnormalities are found on magnetic resonance scans of the cervical spine in 19 percent of asymptomatic subjects, such findings must be strictly matched with clinical signs and symptoms before therapy is instituted [91]. Furthermore, few MRI findings showed large magnitude associations with symptom outcomes even when applying more specific definitions for spine-related symptom outcomes [3].

Other Considerations: Development of a novel rabbit model of angular kyphosis provides a reliable platform for investigating the pathophysiology of spinal deformities and evaluating therapeutic interventions [1]. Schroth exercises exhibited long-term effects in improving both spinal deformity and quality of life in adolescent idiopathic scoliosis [24], yet improved spinal morphology of postsurgical adolescent idiopathic scoliosis patients has no significant impact on their static standing balance [8]. Spinal deformities in Noonan syndrome tend to develop early and are relatively severe, necessitating clinical and radiographic assessment with careful follow-up for early detection and treatment [33]. A unique neural arch shape may clarify the pathophysiology of degenerative spondylolisthesis and explain its greater prevalence in females [13]. The investigation represents the best available evidence regarding the radiographic and clinical natural history of cervical degeneration, with data that will have a critical influence on discussions with patients regarding their MRI findings [11]. Measurements document the radiographic parameters of the cervical spine in children followed longitudinally from before the age of three years through skeletal maturity [35]. Despite significant changes during skeletal maturity, modifications in spinal curvatures are not large enough to be considered in clinical practice and to impact surgical planning [93]. Repetitive loading of the spine has demonstrable short-term and possibly permanent effects on the lumbar intervertebral disk, as suggested by T2* values in asymptomatic elite rowers [71]. The observed epidemiology of lumbar spinal degeneration in the community-based population is consistent with an ordered progression beginning in the anterior structures for the majority of individuals [32]. No associations between paraspinal muscle composition or cross-sectional area and low back pain experienced were observed after a five-year follow-up in fighter pilots [29]. An understanding of available spine imaging modalities is critical to safely and effectively manage spinal disorders, with specific indications, advantages, and disadvantages for radiographs, CT, MRI, and other techniques depending on the pathology [2]. The sagittal spinal alignment should be considered when assessing the long-term prognosis of patients with reverse total shoulder arthroplasty [28]. Vascular complications of intervertebral-disc surgery are rare but extremely serious, requiring early recognition and immediate treatment to avoid high morbidity and mortality [92].

Recovery

Light activity (weeks): Evidence does not define specific week ranges for light activity or return to desk work. However, short-term follow-up studies indicate that percutaneous spinal endoscopy with a unilateral interlaminar approach for central lumbar spinal stenosis did not cause meaningful changes in IHI, CDS, or spine stability [9]. Similarly, patients with > 50% inferior articular process defects show no difference in lumbar stability or clinical outcomes compared to those with ≤ 50% defects after percutaneous endoscopic interlaminar lumbar discectomy in the short term [25].

Full activity (months): Short-term studies demonstrate similar clinical improvements for both disk replacements and fusion procedures at up to 2-year follow-up [84]. Schroth exercises exhibited long-term effects in improving both spinal deformity and quality of life [24]. Improved spinal morphology of postsurgical adolescent idiopathic scoliosis patients has no significant impact on their static standing balance [8].

Complete recovery / outcome plateau (months): Treatment outcomes following tissue regeneration for spinal cord injury remain dismal despite advances in medical care and rehabilitation [6]. Longitudinal cumulative outcomes after adult spinal deformity surgery can be assessed utilizing patient-reported outcome measures to evaluate quality of life and disability over time [27]. Most patients with cervical spondylotic myelopathy become worse clinically if the disorder is left untreated, with more than 50 percent progressing to severe disability [34]. Curves of more than 50 degrees progress relentlessly after skeletal maturity in institutionalized adults with cerebral palsy [96].

Rehabilitation protocol: No specific rehabilitation protocols, immobilisation durations, or weight-bearing progressions are detailed in the provided evidence. However, spinal deformities in Noonan syndrome tend to develop early and are relatively severe, necessitating clinical and radiographic assessment with careful follow-up for early detection and treatment [33]. Scoliosis in Duchenne muscular dystrophy children is fully reducible in the initial stage and becomes structural over time [94]. As the spinal curve progresses in Duchenne muscular dystrophy, flexibility decreases over time [94].

Functional milestones: Few MRI findings showed large magnitude associations with chronic low back pain or radicular symptoms even when applying more specific definitions for spine-related symptom outcomes [3]. Findings on magnetic resonance scans were not predictive of the development or duration of low-back pain [7]. No associations between paraspinal muscle composition or cross-sectional area and low back pain were observed after a five-year follow-up in fighter pilots [29]. Sagittal spinal alignment should be considered when assessing the long-term prognosis of patients with reverse total shoulder arthroplasty [28].

Other Considerations: The investigation represents the best available evidence regarding the radiographic and clinical natural history of cervical degeneration [11]. A progression of degenerative changes in the cervical spine on MRI over a 20-year period was detected in nearly all subjects [31]. The observed epidemiology of lumbar spinal degeneration in a community-based population is consistent with an ordered progression beginning in the anterior structures for the majority of individuals [32]. Radiographic parameters of the cervical spine in children have been documented longitudinally from before the age of three years through skeletal maturity [35]. Knowing the timing of the growth peak provides valuable information on the likelihood of progression to a magnitude requiring spinal arthrodesis in girls with idiopathic scoliosis [95]. The magnitude of the curve at the time of skeletal maturity is the factor that correlates most with continued progression after skeletal maturity in institutionalized adults with cerebral palsy [96]. Complete loss of the inferior articular process remains a concern for long-term instability after percutaneous endoscopic interlaminar lumbar discectomy [25].

Key Evidence

• [L5] It provides a reliable platform for investigating the pathophysiology of spinal deformities and evaluating therapeutic interventions. (10.1186/s13018-025-06220-1)
• [L2] Even when applying more specific definitions for spine-related symptom outcomes, few MRI findings showed large magnitude associations with symptom outcomes. (10.1186/1471-2474-15-152)
• [L5] Advances in medical care and rehabilitation continue to improve, but treatment outcomes following tissue regeneration for spinal cord injury remain dismal. (10.5435/jaaos-d-14-00314)
• [L2] The findings on magnetic resonance scans were not predictive of the development or duration of low-back pain. (10.2106/00004623-200109000-00002)
• [L3] Improved spinal morphology of postsurgical AIS patients has no significant impact on their static standing balance. (10.1186/s12891-020-03462-4)
• [L4] The clinical and radiographic efficacies of this surgery for central lumbar spinal stenosis were good in short-term follow-up, and this surgery did not cause meaningful changes in IHI, CDS, and spine stability in short-term follow-up. (10.1186/s12891-021-04100-3)
• [L5] Due to the unique microarchitecture of the cervical vertebrae, fractures occur much later in this region than they do in the thoracic or lumbar spine. (10.1186/s13018-022-03105-5)
• [L4] The investigation represents the best available evidence regarding the radiographic and clinical natural history of cervical degeneration, with data that will have a critical influence on discussions with patients regarding their MRI findings. (10.2106/jbjs.18.00071)
• [L4] We emphasize that these findings represent roentgenographic abnormalities only, and any clinical decisions concerning the treatment of pain in the thoracic spine usually require additional studies. (10.2106/00004623-199511000-00001)
• [L3] This unique neural arch shape may clarify the pathophysiology of degenerative spondylolisthesis and explain its greater prevalence in females. (10.1186/s12891-021-04901-6)
• [Paper] The paper is a preliminary report on mechanical tests of the lumbosacral spine and does not provide a clinical conclusion regarding patient outcomes or treatment efficacy. (10.2106/00004623-195739050-00014)
• [L5] The monograph presents contradictory conceptions regarding the pathogenesis, diagnosis, and treatment of cervical syndrome, though there is general agreement on the role of intervertebral foramina in nerve-root irritation and the significance of the cervical sympathetic nervous system. (10.2106/00004623-195638020-00031)
• [L3] Global lumbar spine kinematics do not reflect regional lumbar spine kinematics, which has implications for interpretation of measures of spinal posture, motion and loading. (10.1186/1471-2474-9-152)
• [L5] MRI is a non-invasive, high-resolution, multiplanar imaging modality that provides detailed visualization of osseous and soft-tissue structures of the cervical spine, including the intervertebral discs, spinal cord, and nerve roots, and is essential for evaluating the spectrum of cervical spinal disease. (10.2106/00004623-200200002-00009)
• [L1] Our findings suggest that currently available devices are capable of assessing spinal posture with good accuracy in the clinical setting. (10.1186/s12891-019-2430-6)
• [L5] Magnetic resonance is an excellent modality for imaging pathologic processes in the pediatric spine, allowing high-resolution views of osseous and soft-tissue structures. (10.5435/00124635-200307000-00004)
• [L5] This Specialty Update reviews the highest-quality peer-reviewed research in the area of spinal conditions, highlighting advances in the management of cervical and lumbar spine conditions, pediatric and adult spinal deformity, spinal cord injury, and spinal fracture and trauma to support treatment decision-making. (10.2106/jbjs.17.00276)
• [L4] The position of the lumbar spine center of rotation changes with variations in load and differs between movement types, suggesting distinct motion patterns in the lower lumbar spine. (10.1186/s12891-025-08410-8)
• [L5] Absolute surgical indications for disc herniation include deteriorating neurological deficits with myelopathy or cauda equina syndrome. (10.1302/2058-5241.6.210020)
• [L1] The literature offers various stereophotogrammetric protocols to quantify multi-segmental motion of the thoracolumbar spine without a standard guideline, and approaches remain limited from a clinical point of view. (10.1186/s12891-022-05925-2)
• [L1] Meanwhile, Schroth exhibited long-term effects in improving both spinal deformity and quality of life. (10.1186/s12891-024-08223-1)
• [L4] In the short term, patients with > 50% IAP defects show no difference in lumbar stability or clinical outcomes compared to those with ≤ 50% defects, though complete IAP loss remains a concern for long-term instability. (10.1186/s12891-025-09004-0)
• [L4] We recommend utilizing this standard in studying various disorders of the spine to avoid technical causes for the appearance of a curve. (10.1186/s12891-021-03949-8)
• [L3] The study describes the longitudinal cumulative outcome after adult spinal deformity surgery, utilizing patient-reported outcome measures to assess quality of life and disability over time. (10.1186/s12891-025-08927-y)
• [L3] The sagittal spinal alignment should be considered when assessing the long-term prognosis of patients with rTSA. (10.1016/j.jse.2024.10.017)
• [L2] However, no associations between muscle composition or CSA and low back pain experienced were observed after the five-year follow-up. (10.1186/s12891-019-2551-y)
• [L3] A progression of degenerative changes in the cervical spine on MRI over the 20-year period was detected in nearly all subjects. (10.2106/jbjs.17.01347)
• [L3] The observed epidemiology of lumbar spinal degeneration in the community-based population is consistent with an ordered progression beginning in the anterior structures, for the majority of individuals. (10.1186/1471-2474-12-202)
• [L4] Since the deformities tend to develop early and are relatively severe, a clinical and, if necessary, radiographic assessment of the spine with careful follow-up should be performed for early detection and treatment of spinal deformity. (10.2106/00004623-200110000-00006)
• [L5] Most patients with cervical spondylotic myelopathy become worse clinically if the disorder is left untreated, with more than 50 percent progressing to severe disability. (10.2106/00004623-199409000-00020)
• [L3] The measurements presented in the current study are important because they are the first, as far as we know, to document the radiographic parameters of the cervical spine in children who were followed longitudinally from before the age of three years through the course of growth and development until skeletal maturity. (10.2106/00004623-200108000-00011)
• [L4] Accessory ossicles of the spine exhibit varied prevalence and clinical significance, with some presenting minor associations with symptoms and others linked to specific syndromes or spinal disorders. (10.1186/s13018-024-05407-2)
• [L5] Regardless of the setting, when cauda equina syndrome is diagnosed, the treatment is urgent surgical decompression of the spinal canal. (10.5435/00124635-200808000-00006)
• [L4] These data can provide new insights into the biomechanics of the lumbar spine and optimize the parameters of artificial lumbar spine devices. (10.1186/s12891-022-05160-9)
• [L4] Treatment depends on symptom severity and neurological involvement; fusion is indicated for instability causing cord compression, while laminectomy or foramen magnum enlargement may be necessary for compression. (10.2106/00004623-196850020-00008)
• [L5] Pushing conditions also warrant attention to the lower spinal cord and the nerve roots on both sides of the main thoracic curve. (10.1186/s12891-024-07832-0)
• [L1] The review identifies a range of wearable technologies and biofeedback modalities used to modulate spine motor control, highlighting the need for standardized reporting and further research to establish clinical efficacy. (10.1186/s12891-024-07867-3)
• [L5] No existing prognostic classification system can predict which patients with a congenital osseous anomaly of the cervical spine are at risk for future neurologic injury. (10.2106/00004623-200202000-00017)
• [L5] Recent advances in cervical spinal cord stimulation have demonstrated improved efficacy as a therapeutic intervention for restoring hand functions in individuals with spinal cord injuries or stroke, yielding significant improvements in grip force, proximal arm strength and muscle activation with both immediate and sustained effects. (10.1177/17531934241307515)
• [L5] The findings suggest that the intervertebral PSAC are safe and effective for cervical fixation, showing no adverse effects on the cervical spine or animal bodies, and demonstrating equivalent fixation and healing capabilities compared to control devices. (10.1186/s13018-025-06458-9)
• [L2] Individualized administration route preference-matched treatment in acute low back pain improves therapeutic outcomes, although further studies with larger cohorts are needed. (10.1186/s13018-020-01594-w)
• [L4] The authors provide strong evidence that Su's three-column theory complies with the characteristics of vertebral physiological structure, vertebral fracture, and vertebral biomechanics. (10.1186/s12891-020-03550-5)
• [L3] The Hip-Spine Classification system allows surgeons to make appropriate evaluations preoperatively, and it guides the use of DM components in patients with spinopelvic pathology in order to reduce the risk of dislocation in these high-risk patients. (10.1302/0301-620x.103b7.bjj-2020-2448.r2)
• [L4] Further analysis by an expert panel is required to develop specific classification criteria for thoracolumbar fascia. (10.1186/s12891-018-2088-5)
• [L3] With advancing age, spinopelvic biomechanics demonstrate decreased spinal mobility and increased pelvic/hip mobility. (10.1302/0301-620x.106b8.bjj-2023-1197.r1)
• [L5] Understanding the biomechanical principles of spinal instrumentation and motion coupling is essential for optimizing three-dimensional correction of thoracolumbar spinal deformities and achieving favorable mechanical environments for fusion. (10.5435/jaaos-d-24-01156)
• [L2] The T4-L1-Hip axis is conceptually aligned with the description of spinal shapes in the Roussouly classification but with the advantage of utilizing continuous measures of spinal alignment. (10.2106/jbjs.24.01489)
• [L5] Increasing the load has a significant impact on the coupled translational movement of lumbar facet joints. (10.1186/s13018-022-03016-5)
• [L4] These data from the individual spinal segments may be helpful to comprehensively evaluate the status of the spine and to design a better preoperative plan before instrumentation. (10.1186/s12891-024-07324-1)
• [L1] This review highlights the complexity of pelvic, trunk and upper limb biomechanics in individuals with spinal deformities. (10.1186/s13018-025-06063-w)
• [L3] The lumbosacral and hip motions were the major contributors to global alignment postural change. (10.1186/s12891-021-04865-7)
• [L3] Changes in lumbar-stabilizing mechanisms in the presence of muscle fatigue seem to be caused by modulation of lumbopelvic kinematics. (10.1186/1471-2474-11-112)
• [L5] Elucidation of the exact mechanisms for compensation after radiculomedullary vessel sacrifice requires further study but will be aided by preoperative, intraoperative, and postoperative comparative angiography; protocols in place at centers minimize the risk of spinal cord ischemia during planned sacrifice. (10.5435/jaaos-d-14-00219)
• [L4] The authors encourage spinal surgeons and researchers to be aware of such variations when performing thoracic- and lumbar-level surgery and assessing spinal alignment and parameters. (10.1186/s13018-018-0835-9)
• [L5] Critical spinal lytic defects result in kinematic abnormalities and lower the compressive strength of the spine. (10.2106/jbjs.19.00419)
• [L5] This is a comprehensive, up-to-date reference source on the use of magnetic resonance imaging and computed tomography for the scanning of the entire spine, serving as a useful text for any spine surgeon or radiologist. (10.2106/00004623-199410000-00028)
• [L3] The study proposed a novel classification with four types of degenerative thoracolumbar kyphosis based on thoracolumbar kyphosis and balance, followed by targeted treatment strategies for various types. (10.1186/s13018-025-05713-3)
• [L4] This study found weak to moderate effects of individual kinematic variables and lumbar lordosis on IV-RoMmax at other intervertebral levels. (10.1186/s12891-016-0975-1)
• [L5] The study documented the complete three-dimensional elastic physical properties of each lumbar intervertebral level, finding that load-displacement curves are non-linear and motions are coupled, with ranges of motion comparing favorably with reported in vivo values. (10.2106/00004623-199403000-00012)
• [L3] Consequently, it has the potential to be integrated into future osteoporosis classification systems. (10.1186/s12891-025-09431-z)
• [L5] MR images could be used to distinguish the histological structures of normal and malformed mouse spines, and malformed vertebrae were accompanied by adjacent intervertebral structures that corresponded to the fully segmented structures observed in human congenital scoliosis, but the intervertebral conditions varied. (10.1186/s12891-024-07460-8)
• [L5] Performing both imaging modalities under the same conditions would be helpful in the evaluation of disc degeneration. (10.1186/s12891-015-0610-6)
• [L5] Loading in the anterior-oblique direction required lower external force or moment to keep the lumbar spine in the neutral position compared to vertical or posterior-oblique directions. (10.1155/2018/4517471)
• [L3] The T2* values suggest that repetitive loading of the spine has demonstrable short-term and possibly permanent effects on the lumbar intervertebral disk. (10.1177/23259671221088572)
• [L4] Spine balance can alter THA outcomes, but the exact mechanism is yet to be elucidated. (10.1016/j.arth.2017.11.021)
• [L5] Higher values of ligament stiffness over all lumbar levels could lead to a shift of the loading and the motion between segments to the lower lumbar levels. (10.1186/s12891-016-0942-x)
• [L3] Thus, a routine MRI evaluation appears warranted for those patients if aged less than 10 years, being male or having left thoracic or right lumbar curve. (10.1186/s12891-016-1026-7)
• [L5] Nevertheless, the general surgical principle remains paramount: instrumentation should never extend beyond the contralateral intervertebral disc border, regardless of presumed vascular anatomy. (10.1186/s13018-025-06066-7)
• [L4] The study aimed to identify pathoanatomical pathways of degeneration in lumbar motion segments by clustering MRI findings, but the provided text does not contain the authors' explicit conclusion statement. (10.1186/1471-2474-14-198)
• [L5] This report describes specialized pulse sequences and imaging techniques for evaluating the spine, defines the defining characteristics of the three compartments into which spinal tumors can be classified, and provides a basic knowledge of the tumors commonly encountered in the spine. (10.2106/jbjs.h.00825)
• [L5] The proposed method provides an option rather than a final position for quantifying cervical spine muscle composition and morphology using MRI. (10.1186/s12891-018-2074-y)
• [Case_report] This technique should be considered for patients in whom general anesthesia is contraindicated and neuraxial anesthesia is extremely difficult, such as patients with ankylosing spondylitis. (10.1007/s11999-010-1317-5)
• [L5] The review underscores the need for consistent nomenclature, advanced imaging, and the integration of artificial intelligence to personalize care based on individual anatomy and biomechanics. (10.1302/0301-620x.106b11.bjj-2024-0373)
• [L4] Lumbar HR-MDCT is not valid for the in vivo evaluation of bone architecture in the lumbar spine as there was no significant correlation between HR-MDCT and micro-CT analysis of vertebral biopsies. (10.1186/s13018-020-01895-0)
• [L4] This study will offer the needed data in order to establish PC-MRI on spinal cord motion within the diagnostic work-up of patients suffering from spinal canal stenosis. (10.1186/s13018-019-1381-9)
• [L5] Imaging studies should be used to confirm the clinical impression derived from history and physical examination, with careful correlation of anatomic abnormalities to symptoms, and advanced neurodiagnostic imaging should be refrained from until appropriate nonoperative management has failed. (10.5435/00124635-199609000-00002)
• [L5] Short-term studies demonstrate similar clinical improvements for both disk replacements and fusion procedures at up to 2-year follow-up. (10.5435/00124635-200612000-00002)
• [L3] These results lead to a more conservative approach in monitoring of scoliotic curves in clinical applications; smaller number of radiographs would be saved, however the risk of having non-measured curves with progression would be decreased. (10.1186/s12891-018-2303-4)
• [Case_report] The authors note that treatment is generally non-operative, with surgery reserved for inadequate reduction or persistent symptoms. (10.2106/00004623-198870020-00020)
• [L4] Management ranges from conservative and pharmacologic measures to surgical treatment, often requiring a collaborative plan between orthopaedic surgeons and obstetricians. (10.5435/jaaos-d-14-00248)
• [L5] Six months of spinal growth modulation created significant spinal deformity in all three planes compared with sham-surgery controls. (10.2106/jbjs.j.00247)
• [L2] High-quality studies targeting non-surgical treatment as an evidence-based alternative to surgical interventions for conditions related to excessive anterior pelvic tilt are warranted. (10.1302/2058-5241.5.190017)
• [L4] The finding of major abnormalities on magnetic resonance scans of the cervical spine in 19 percent of asymptomatic subjects suggests that such findings must be strictly matched with clinical signs and symptoms before therapy is instituted. (10.2106/00004623-199173070-00028)
• [L5] Vascular complications of intervertebral-disc surgery are rare but extremely serious, requiring early recognition and immediate treatment to avoid high morbidity and mortality. (10.2106/00004623-196850020-00018)
• [L4] Despite significant changes during skeletal maturity, the modifications in spinal curvatures are not large enough to be considered in clinical practice and to impact surgical planning. (10.2106/jbjs.22.00977)
• [L4] Afterward, as spinal curve progresses, flexibility decreases over time. (10.1186/s12891-019-2661-6)
• [L3] Knowing the timing of the growth peak provides valuable information on the likelihood of progression to a magnitude requiring spinal arthrodesis. (10.2106/00004623-200005000-00009)
• [L3] The magnitude of the curve at the time of skeletal maturity is the factor that correlates most with continued progression after skeletal maturity, with curves of more than 50 degrees progressing relentlessly. (10.2106/00004623-198870090-00002)

See Also

• Deformities
• Cervical Region
• Disc Degeneration
• Surgical Interventions
• Fusion Procedures

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