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Numbness and Tingling in the Hand and Arm

What causes numbness, tingling or 'pins and needles' in the hand and arm — from carpal tunnel and cubital tunnel to other nerve problems — when it matters, and what helps.

39 citationsUpdated Sep 2026

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Overview

Numbness and tingling in the hand and arm frequently result from median or ulnar nerve entrapment, a spectrum of neuropathies where clinical signs often discord with electrodiagnostic and ultrasound findings [3]. This discrepancy is severe in mild-to-moderate carpal tunnel syndrome, where clinical prevalence estimates reach 73% compared to 51% on objective testing [10]. Consequently, patients and clinicians considering surgery for mild-to-moderate median neuropathy should utilize additional testing, such as electrodiagnostic studies or ultrasound, to confirm the diagnosis and ensure surgical benefit [3]. Standardized outcome measurements and clear definitions distinguishing recurrence from persistent compression are required to enable comparison of results across different surgical techniques and clinics in revision nerve compression surgery [2]. Agreements on supplementary diagnostics are also necessary for these revision procedures [2].

Upper-extremity neuropathy can develop following non-upper extremity surgeries, particularly anterior cervical discectomy and fusion [4]. Neuropathy symptoms following shoulder surgery were often refractory to conservative management, yet surgical decompression led to nearly 90% symptom resolution [6]. Patients with a history of ulnar nerve lesions face a significantly increased risk of developing carpal tunnel syndrome, especially within the first 2 years [8]. In cases of suspected double crush syndrome, symptoms that are mild may respond to conservative treatment, while invasive treatments should be initiated preferentially at sites with greater clinical suspicion [12]. For severe chronic ulnar nerve compression, anterior interosseous nerve transfer combined with cubital and ulnar tunnel release is encouraged as a standard treatment, resulting in sustained clinical and electrophysiological improvements [15].

Initial evaluation requires a thorough examination of nerve type, sensibility, motor function, and sudomotor function, though factors such as intoxication, anxiety, or extensive injury may interfere [24]. If conditions are not satisfactory for a thorough examination during the initial evaluation, the hand should be reexamined within a reasonable period to determine the extent of nerve and other injuries [24]. A flexor tendon function deficit after a finger laceration indicates that at least one digital nerve has probably been injured [24]. In neuropathy rehabilitation, the assessment of position and tactile sensations should not be ignored when determining participation in manual skills [5]. Magnetic resonance neurography provides details regarding nerve anatomic relationships, fascicular pattern, intraneural swelling, and downstream muscle injury [24].

Background & Causes

Pathophysiology and Histopathology

Chronic nerve compression initiates with the breakdown of the blood-nerve barrier, progressing to axonal degeneration if compression persists [25]. Clinical signs, symptoms, and sensory testing results parallel these histopathologic changes [25]. Abnormal postures or positions contribute to chronic compression by directly compressing nerves or placing them on tension [25]. Additionally, abnormal postures can place muscles in shortened positions, leading to secondary muscle weakness and overuse of compensating muscles [25]. In Hansen's disease, neuritic pain arises secondary to nerve infection, immunologic defense mechanisms, nerve compression in fibroosseous tunnels, or nerve abscess [26]. Reaction neuritis in this condition constitutes a medical emergency, as untreated sensory loss can become devastating and irreversible [26]. The gate theory of pain posits that painful information displaced or modified by less noxious input cannot be processed through the dorsal horn of the spinal cord [42].

Median Nerve Compression

Clinical signs and symptoms for mild-to-moderate idiopathic median neuropathy at the carpal tunnel are discordant from diagnoses based on electrodiagnostic studies and ultrasound [3]. The estimated prevalence of mild-to-moderate carpal tunnel syndrome is 73% based on clinical signs and symptoms, compared to 51% based on electrodiagnostic studies and ultrasound [10]. More than 50% of patients with perilunate injuries who did not undergo carpal tunnel release at initial surgery required a release within the follow-up period [19]. A bifid median nerve entrapment by forearm musculature is a rare anomaly that surgeons should consider when assessing patients with symptoms of median nerve compression [7]. Median nerve symptoms can also occur secondary to lacertus fibrosus syndrome following distal biceps tendon repair [22]. Upper-extremity neuropathy, including median neuropathy, can develop following nonupper extremity surgeries, particularly anterior cervical discectomy and fusion (ACDF) [4].

Ulnar Nerve Compression

As the severity of ulnar neuropathy at the elbow increases, the cross-sectional area (CSA) of the ulnar nerve correspondingly increases at the elbow [9]. Neuropathy symptoms following shoulder surgery are often refractory to conservative management [6]. The contribution of the anconeus epitrochlearis muscle to ulnar nerve compression neuropathy or protection of the ulnar nerve could not be discerned for the standard population [14]. Compression of the ulnar nerve proximal to Guyon's canal from a tortuous artery is rare [27]. Nerve conduction studies and MRI are useful diagnostic investigations when clinical signs suggest ulnar nerve compression from a tortuous artery proximal to Guyon's canal [27]. Posttraumatic compressive neuropathy of the deep motor branch of the ulnar nerve can be caused by heterotopic ossification [18]. Decompressing the deep motor branch of the ulnar nerve allows for spontaneous nerve recovery and reinnervation of ulnar nerve innervated intrinsic muscles [18]. Double crush syndrome involving the ulnar nerve at the elbow and wrist may respond to conservative treatment if symptoms are mild [12].

Diagnostic and Assessment Considerations

A careful history suggests the correct diagnosis in approximately 90% of patients with hand problems [40]. Complaints of numbness or tingling indicate a neurologic problem rather than a mechanical one [40]. Strict diagnostic criteria are necessary in nerve entrapment surgery [29]. Future reports on nerve entrapment should clearly differentiate between primary and secondary lacertus fibrosis syndrome [29]. Clear definitions of recurrence versus persistent compression neuropathy are needed to enable comparing results from different techniques and clinics [2].

Pain Evaluation: The use of a pain evaluation questionnaire that includes a body diagram, a subjective questionnaire, and visual analog scales is useful in evaluating patients with nerve compression or diffuse symptoms [25].

Carpal Tunnel Syndrome Questionnaire: This tool assesses symptom severity (11 items) and functional status (8 items) using a Likert scale where higher scores indicate decreased functional status [25].

Disabilities of Arm, Shoulder, and Hand (DASH) Questionnaire: This instrument uses 30 items ranked from 1 to 5, where higher scores indicate higher levels of disability [25].

Michigan Hand Outcomes Questionnaire (MHQ): This is a 67-item questionnaire that addresses specific domains of overall hand function, physical function, cosmesis, and satisfaction [25].

Patient-Specific Functional Scale (PSFS): This scale assesses items identified by patients, with each item ranked on a scale from 0 to 10 [25].

Symptoms & Presentation

Median nerve symptoms may present secondary to lacertus fibrosus syndrome following distal biceps tendon repair [22]. In the context of perilunate injuries, more than 50% of patients who did not undergo carpal tunnel release at the initial surgery required a release within the follow-up period [19]. While rare, compression of the ulnar nerve proximal to Guyon's canal from a tortuous artery is a diagnostic possibility that clinical signs may suggest [27].

The unique asymmetric neurologic innervation to the pectoralis minor predisposes the human shoulder to neurologic and musculoskeletal imbalance, producing the Human Disharmony Loop syndrome [17]. In neuropathy rehabilitation, the assessment of position and tactile sensations should not be ignored in determining participation in manual skills [5].

Management

Diagnostic Evaluation and Preoperative Assessment

When signs and symptoms suggest mild-to-moderate median neuropathy and surgery is being considered, additional testing such as electrodiagnostic studies (EDS) or ultrasound (US) may increase the probability of actual median neuropathy that can benefit from surgery [3]. The physical examination of suspected complex regional pain syndrome (CRPS) patients should include a neurologic assessment and evaluation of the cervical and thoracic spine [31]. The presence of cervical disease may exacerbate CRPS, representing a form of "double-crush syndrome" [31]. Preexisting or acquired thoracic outlet or distant compression neuropathies can represent a "triple or more" crush syndrome [31]. Currently, there are no objective laboratory tests to aid in the diagnosis of CRPS [31].

A high index of suspicion is necessary in the evaluation of patients with hand injuries, as digital nerve injuries are frequently overlooked [24]. If a flexor tendon function deficit is present after a finger laceration, at least one digital nerve probably has been injured as well [24]. Four areas of consideration are important when evaluating a patient with a hand nerve injury: type of injury, sensibility evaluation, motor function, and sudomotor function [24]. Normal two-point discrimination usually is 6 mm or less [24]. Patients with closed injuries or partial injuries to nerves may show spotty appreciation of light touch and pain and have markedly widened two-point discrimination [24]. Magnetic resonance neurography (MRA) is reported to be able to provide details regarding nerve anatomic relationships, fascicular pattern, intraneural swelling, and evaluation of downstream muscle injury [24].

The use of a pain evaluation questionnaire that includes a body diagram, a subjective questionnaire, and visual analog scales is useful in the evaluation of patients with nerve compression and/or diffuse symptoms [25]. The carpal tunnel syndrome questionnaire assesses symptom severity (11 items) and functional status (8 items) [25]. The Disabilities of Arm, Shoulder, and Hand (DASH) questionnaire uses a standardized 30 items to allow for comparison of upper extremity conditions [25]. The Patient-Specific Functional Scale (PSFS) assesses items identified by patients, with each patient identifying three activities or tasks they find difficult or impossible to perform [25]. Hand abduction tracings are a quantitative outcome measure to follow recovery over time for intrinsic hand function in patients with severe ulnar neuropathy following surgical intervention [13].

Non-Operative Management

Conservative treatment of neuroma pain should consist of medical management, including pain-modulating medications, behavior modification, therapy, and modalities such as protective garments, desensitization, massage, nerve gliding, and TENS [35]. Local corticosteroid injections have been described for neuroma pain, though atrophy of local adipose tissue can exacerbate neuroma pain [35]. Sensory interventions for upper limb conditions are inexpensive, noninvasive, and easy to perform, allowing implementation into conventional therapy practice in any setting [23]. Improved recognition and early intervention can help mitigate or even correct emerging hand deformities and prevent loss of intrinsic hand function [16].

For asymptomatic vascular malformations in the hand, the lesion can usually be left alone [33]. Some patients with vascular malformations that swell when dependent or with activity are effectively treated with a fitted compression glove [33]. Tricyclic antidepressants, neurotropics, or low doses of benzodiazepines may help patients sleep with thoracic outlet syndrome (TOS) [32]. Narcotics should rarely be prescribed preoperatively for TOS [32].

Operative Management

Surgical decompression of neuropathy following shoulder surgery led to nearly 90% symptom resolution [6]. Decompressing the deep motor branch of the ulnar nerve allowed for spontaneous nerve recovery and reinnervation of ulnar nerve innervated intrinsic muscles in a case of posttraumatic compressive neuropathy caused by heterotopic ossification [18]. More than 50% of patients who did not undergo carpal tunnel release at the initial surgery for perilunate injuries required a release within the follow-up period [19].

The best treatment for a symptomatic neuroma is prevention, which involves repairing even nonessential sensory nerves whenever possible [35]. For established neuromas, the best strategy is to excise the neuroma and give the axons an innervation target to avoid neuroma regrowth and restore central nervous system connectivity [35]. For a small-diameter neuroma-in-continuity, the neuroma may be excised and the nerve ends mobilized and primarily repaired [35]. For small gaps in nerve repair, the freshened proximal stump can be repaired via graft, conduit, or autologous nerve allograft (ANA) to the distal nerve stump [35]. If the distal nerve is unavailable for repair, the freshened nerve end can be sewn in a reverse end-to-side (supercharging) fashion to a nearby nerve trunk [35]. When a neuroma is not repairable and not associated with neuropathic pain, simple surgical excision and proximal transposition to a less vulnerable location are often effective [35]. Targeted muscle reinnervation involves identifying and dividing a motor branch of a neighboring functional muscle and performing a nerve transfer of the prepared nerve stump to the motor branch near its entry point into the muscle [35].

The radial sensory nerve is released at its point of compression between the tendons of the extensor carpi radialis longus and brachioradialis [34]. A full tenotomy of the brachioradialis tendon is performed and a portion of the tendon is resected to completely decompress the radial sensory nerve [34]. Neurolysis is not performed during radial sensory nerve decompression [34]. A piece of bioresorbable adhesion barrier is placed over the nerve to decrease scarring after radial sensory nerve decompression [34]. Maintaining the forearm in neutral rotation or supination reduces the risk of injury to the dorsal sensory branch of the ulnar nerve during wrist arthroscopy using the 6-ulnar and direct foveal portals [20].

Surgical management of chronic deformities after CRPS is possible, but exacerbation of a dystrophic response is a potential risk [30]. Surgery on contracted joints after CRPS should not be performed until maximal nonoperative improvement has been achieved, with a waiting period of a minimum of 3 to 6 months after successful elimination of active dystrophic pain [30]. Indications for surgery on contracted MCP or PIP joints after CRPS are joint pain without diffuse dystrophic symptoms and arthrofibrosis that interferes with function [30]. Restoration of full flexion or extension is an unreasonable goal or expectation for surgical correction of CRPS-related contractures [30]. The range of motion achieved during surgery for CRPS-related contractures is rarely maintained after surgery as some loss is expected [30].

For injury to the superficial branch of the radial nerve complicated by CRPS, options for treatment include proximal transection of the nerve in normal tissue beneath the brachioradialis muscle, exploration with neurolysis, or repair [36]. If repair is selected for a superficial radial nerve injury with CRPS, microscopic dissection plus repair of injured fascicles is performed end-to-end or with a nerve graft [36]. A sural nerve or a forearm nerve is harvested from a separate incision for interposition nerve grafting in superficial radial nerve injuries with CRPS [36]. The preference for using the sural nerve in superficial radial nerve grafting is to avoid a potential nociceptive focus in the same extremity [36]. Nerve grafting for superficial radial nerve injuries is completed with 8-0 or 9-0 nonabsorbable suture under the operating microscope [36]. If nerve transection is selected for a superficial radial nerve injury, the resection should occur adjacent to normal tissue or be relocated to an unscarred area [36]. Excessive scar-related attachment of the nerve to underlying tendon structures or overlying skin requires neural bed modification, preferably by covering the nerve with a section of the adjacent cephalic vein or harvesting a separate vein [36]. Postoperative reactivation of the dystrophic process after superficial radial nerve surgery can be minimized by maintaining a continuous autonomic blockade for 3 to 5 days after surgery [36]. Surgery for CRPS should not be performed unless sympathectomy intervention reduces the pain considerably [36]. An anesthesiologist should perform a continuous autonomic block before surgery for intraoperative and postoperative pain management lasting 2 to 5 days [36].

Indications for surgical management of a painful median nerve with CRPS include quiescent or stable sympathetically maintained CRPS with mechanical pain and previous neurolysis with scar and decreased nerve mobility [30]. Preoperative evaluation for a painful median nerve with CRPS includes demonstrating painful nerve gliding and evaluating peripheral nerve conduction velocities [30]. The autogenous saphenous vein or allograft is wrapped directly around the median nerve with an opening to allow the palmar cutaneous branch to exit [30]. Chromic suture should be avoided for vein wrapping because chemicals released from the suture can create a nociceptive neural focus [30]. An injured palmar cutaneous branch of the median nerve can be resected and moved to an unscarred area or repaired by using an end-to-end interposition antebrachial cutaneous nerve [30]. A short branch repair of the palmar cutaneous nerve is accomplished under the operating microscope with 9-0 to 10-0 nonabsorbable suture on 75- to 130-µm needles [30]. Postoperatively, the limb is protected from pain and dystrophic flare-up by the use of continuous autonomic blockade [30]. Motion of the affected extremity is initiated in a controlled active therapy program or by using continuous passive motion over the 3- to 5-day period of hospitalization [30]. Surgical correction of secondary joint deformities from arthrofibrosis may be necessary after CRPS [30]. If necessary, all four MCP joints and all four PIP joints can be released in a single operation for CRPS-related contractures [30].

Transfer of a neurovascular island graft is indicated to treat permanent sensory deficits on the radial side of an otherwise normal index finger or on the area of pinch on the distal ulnar aspect of the thumb [37]. Sensibility in a neurovascular island graft is never normal after transfer, and more than half of patients have persistently hyperesthetic skin [37]. The neurovascular bundle should be dissected from proximally to distally so that any anomalies of the vessels can be treated properly [37]. The neurovascular bundle should not be completely freed from the surrounding fatty tissue, especially at the base of the finger, but should be transferred along with some attached tissue [37]. The neurovascular bundle should be channeled through an incision large enough to show the entire bundle to prevent kinking, twisting, or stretching of the nerve or vessels [37]. In complete median nerve paralysis, transfer of a neurovascular island graft to the radial side of the proximal and middle phalanges of the index finger may be desirable if sensibility on the ulnar edge of the thumb pulp is reasonably good [37].

For vascular malformations in the hand, surgical excision is warranted if lesions are markedly symptomatic [33]. The goals of treatment for vascular malformations are to completely extirpate the lesion, preserving tendons, bone, nerve, and uninvolved muscle [33]. Venous malformations are the most common type in the hand, and excision is usually fairly straightforward [33]. High-flow arteriovenous malformations can be explored and excised with a tourniquet on the upper arm so blood loss can be minimal [33]. A surgeon should plan to excise the involved abnormal arteries and reconstruct whatever is necessary with vein grafts for high-flow arteriovenous malformations [33]. Ischemic digits associated with high-flow arteriovenous malformations are probably best amputated [33].

Postoperative Care and Follow-up

The dressing is removed 2 to 3 days after surgery for median nerve compression at the elbow or forearm, and general range-of-motion exercises are started [43]. A sling can be used at night for comfort for 3 weeks after surgery for median nerve compression at the elbow or forearm [43]. Patients are referred for therapy postoperatively to assist with restoration of range of motion and strength [43]. The first phase of graded motor imagery can be started preoperatively so the patient is prepared for postoperative therapy [43].

If a patient has undergone more than two surgical attempts to correct a nerve compression problem, it is less likely that a third operation to relieve symptoms and improve function will be helpful [43]. In patients with a motor deficit after failed nerve compression surgery, nerve graft, nerve transfer, or tendon transfers are considered [43]. If pain is the primary problem after failed nerve compression surgery, a peripheral nerve stimulator or dorsal column stimulator can be considered [43]. Patients after a failed procedure to treat nerve compression can be classified into three groups: persistent, recurrent, and new [43].

The most common intraoperative findings in patients undergoing surgery for recurrent carpal tunnel syndrome are incomplete release of the flexor retinaculum and median nerve adherence to surrounding tissue [43]. In obese patients, failure to make an incision of adequate length may have led to insufficient decompression of the median nerve, especially at the proximal and distal sites of the surgical exposure [43]. Electrodiagnostic studies to evaluate recurrent carpal tunnel syndrome may not be particularly helpful given that patients with successful carpal tunnel surgery will frequently have persistent electrical changes, but should be performed to serve as a baseline [43]. A second common cause of persistent symptoms after primary carpal tunnel release is the likelihood that carpal tunnel syndrome was not the correct diagnosis or was causing an insignificant component of the patient’s symptom complex [43].

Recurrence of symptoms after a period of 6 months or more after initial relief of cubital tunnel syndrome usually implies a new site of ulnar nerve compression in the previous surgical field [39]. Severe causalgia-type pain at the elbow radiating into the medial aspect of the forearm suggests a neuroma of the medial antebrachial cutaneous (MABC) nerve [39]. Severe causalgia-type pain in the ulnar nerve distribution suggests an injury to the ulnar nerve itself [39]. Palpation along the course of the ulnar nerve in the distal forearm progressing to the region of the surgical site will result in deep pain distal to the previous surgical site if a new compression point has developed at the site of the distal surgical exposure [39]. This finding of new compression at the distal surgical exposure is common if great care has not been taken to ensure smooth transposition of the ulnar nerve from its distal position in the forearm underneath the flexor carpi ulnaris to the transposition site at the elbow [39]. Surgical failures are more frequent in cases of cubital tunnel syndrome than in cases of carpal tunnel syndrome [39]. Management of failed cubital tunnel syndrome is made exceedingly difficult by the previous surgical procedure and resultant scarring of the nerve [39]. Electrodiagnostic studies by an experienced examiner are critical in the differential diagnosis and localization of the level of compression for failed cubital tunnel syndrome [39]. Failure to relieve symptoms may imply an incomplete decompression of the primary surgical procedure or an incorrect diagnosis [39]. In patients with definite relief of symptoms for 6 months or longer and then a recurrence of the same symptoms, a secondary traction neuritis of the ulnar nerve may be present [43].

Anesthesia Considerations

A successful regional nerve block hinders motor and sensory conduction and negates nerve testing in the immediate postoperative period [38]. If an immediate postoperative assessment of nerve function is required, a regional block should not be used [38]. Distal peripheral nerve blocks have the advantage of greater preservation of upper extremity motor function compared with a brachial plexus block and can be considered if the goal is early hand mobilization [38]. Fear of masking postoperative compartment syndrome is a relative contraindication to regional anesthesia [38]. Pain in the postoperative period is estimated to precede neurovascular changes by 7.3 hours and can theoretically be masked by the use of nerve blockade provided for analgesia [38]. Ischemic pain is largely unaffected by regional anesthesia [38]. Regional nerve blockade remains an appropriate option for patients undergoing uncomplicated procedures such as ulnar nerve transposition and the vast majority of elective upper extremity operations, even

Key Considerations

Diagnostic Discordance and Assessment

Clinical signs and symptoms for mild-to-moderate median neuropathy at the carpal tunnel are discordant from diagnoses based on electrodiagnostic studies and ultrasound [3]. When signs and symptoms suggest mild-to-moderate median neuropathy and surgery is being considered, additional testing such as electrodiagnostic studies or ultrasound may increase the probability of actual median neuropathy that can benefit from surgery [3].

Etiology and Risk Factors

Median nerve symptoms can occur secondary to lacertus fibrosus syndrome after distal biceps tendon repair [22].

Management and Outcomes

Neuropathy symptoms following shoulder surgery were often refractory to conservative management, while surgical decompression led to nearly 90% symptom resolution [6]. If double crush syndrome is suspected but symptoms are mild, they may respond to conservative treatment, while invasive treatments should be initiated preferentially at sites with greater clinical suspicion [12]. Decompressing the deep motor branch of the ulnar nerve caused by heterotopic ossification allowed for spontaneous nerve recovery and reinnervation of ulnar nerve innervated intrinsic muscles [18].

Clinical Definitions and Anomalies

Clear definitions of recurrence versus persistent compression neuropathy, agreements on supplementary diagnostics, and standardized outcome measurements are needed to enable comparing results from different techniques and clinics [2]. Surgeons should bear bifid median nerve anomalies in mind when assessing patients with symptoms of median nerve compression [7].

Key Evidence

  • [L5] By reviewing the current literature within the spectrum of median nerve entrapment neuropathies, this review aimed to enhance and summarize the current understanding by consolidating the existing knowledge for improved patient outcomes. [1] (10.1016/j.xrrt.2024.10.001)
  • [L5] The authors emphasize the need for clear definitions of recurrence versus persistent compression neuropathy, agreements on supplementary diagnostics, and standardized outcome measurements to enable comparing results from different techniques and clinics. [2] (10.1177/17531934241311822)
  • [L3] When signs and symptoms suggest mild-to-moderate median neuropathy and surgery is being considered, patients and clinicians might consider additional testing, such as EDS or US, to increase the probability of actual median neuropathy that can benefit from surgery. [3] (10.1097/corr.0000000000002751)
  • [L3] Upper-extremity neuropathy can develop following nonupper extremity surgeries, particularly ACDF. [4] (10.1016/j.jhsg.2026.100972)
  • [L3] In neuropathy rehabilitation, the assessment of position and tactile sensations should not be ignored in determining participation in manual skills. [5] (10.1016/j.jht.2024.12.005)
  • [L4] Neuropathy symptoms were often refractory to conservative management, while surgical decompression led to nearly 90% symptom resolution. [6] (10.1016/j.jseint.2024.05.011)
  • [L5] We encourage surgeons to bear such anomalies in mind when assessing patients with symptoms of median nerve compression. [7] (10.1177/17531934251401431)
  • [L2] Patients with a history of ulnar nerve lesions are at a significantly increased risk of developing carpal tunnel syndrome, especially within the first 2 years. [8] (10.1016/j.jhsg.2026.100970)
  • [L2] As the severity of ulnar neuropathy at the elbow increases, the CSA of the ulnar nerve correspondingly increases at the elbow. [9] (10.1016/j.jhsa.2024.12.004)
  • [L5] There is a severe discordance between the estimated prevalence of mild-to-moderate carpal tunnel syndrome based on clinical signs and symptoms (73%) versus electrodiagnostic studies and ultrasound (51%), calling into question whether clinicians can confidently diagnose patients with mild-to-moderate CTS. [10] (10.1097/corr.0000000000002822)
  • [L4] If double crush syndrome is suspected but symptoms are mild, they may respond to conservative treatment, while invasive treatments should be initiated preferentially at sites with greater clinical suspicion. [12] (10.1186/s12891-024-07574-z)
  • [L4] Hand abduction tracings are a quantitative outcome measure to follow recovery over time for intrinsic hand function and can be used in patients with severe ulnar neuropathy following surgical intervention. [13] (10.1016/j.jht.2023.09.005)
  • [L3] The contribution of the anconeus epitrochlearis to compression neuropathy or protection of the ulnar nerve could not be discerned for the standard population. [14] (10.1016/j.jse.2024.09.039)
  • [L4] Anterior interosseous nerve transfer, along with cubital and ulnar tunnel release, results in sustained clinical and electrophysiological improvements in patients with severe chronic ulnar nerve compression, which encourages its adoption as a standard treatment for severe chronic ulnar nerve compression. [15] (10.1177/17531934251381023)
  • [L5] Improved recognition and early intervention can help mitigate or even correct emerging hand deformities and prevent loss of intrinsic hand function, ultimately optimizing client outcomes. [16] (10.1016/j.jht.2025.12.022)
  • [L4] The unique asymmetric neurologic innervation to the pectoralis minor predisposes the human shoulder to neurologic and musculoskeletal imbalance, producing the Human Disharmony Loop syndrome. [17] (10.3390/jcm14051769)
  • [L4] Decompressing the patient's deep motor branch of the ulnar nerve allowed for spontaneous nerve recovery and reinnervation of his ulnar nerve innervated intrinsic muscles. [18] (10.1016/j.jhsg.2024.02.001)
  • [L3] More than 50% of patients who did not undergo carpal tunnel release at the initial surgery required a release within the follow-up period. [19] (10.1016/j.jhsg.2023.09.003)
  • [L4] Maintaining the forearm in neutral rotation or supination reduces the risk of injury to the dorsal sensory branch of the ulnar nerve during procedures using the 6-ulnar and direct foveal portals. [20] (10.1177/17531934251321969)
  • [Case_report] This case presents a unique instance of median nerve symptoms secondary to lacertus fibrosus syndrome after distal biceps tendon repair. [22] (10.1016/j.xrrt.2024.08.009)
  • [L2] These interventions are inexpensive, noninvasive, and easy to perform, so can be easily implemented into conventional therapy practice in any setting. [23] (10.1016/j.jht.2024.08.051)
  • [L5] Compression of the ulnar nerve proximal to Guyon's canal from a tortuous artery is rare, but when clinical signs suggest this possibility, nerve conduction studies and MRI are useful diagnostic investigations. [27] (10.1177/17531934251329861)
  • [L5] The authors agree that strict diagnostic criteria are necessary in nerve entrapment surgery and suggest that future reports clearly differentiate between primary and secondary lacertus fibrosis syndrome, with randomized trials needed for secondary cases. [29] (10.1177/17531934241262214)

References

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[2] Re: van der Heijden EPA, Dailiana ZH, Giele HP. State of the art review. Upper extremity revision nerve compression surgery. J Hand Surg Eur. 2024, 49: 687–97. Journal of Hand Surgery (European Volume). 2025. DOI: 10.1177/17531934241311822

[3] Diagnosis of Mild-to-moderate Idiopathic Median Neuropathy at the Carpal Tunnel Based on Signs and Symptoms is Discordant From Diagnosis Based on Electrodiagnostic Studies and Ultrasound. Clinical Orthopaedics & Related Research. 2023. DOI: 10.1097/corr.0000000000002751

[4] Incidence of Median and Ulnar Neuropathy Following Nonupper Extremity Surgery. Journal of Hand Surgery Global Online. 2026. DOI: 10.1016/j.jhsg.2026.100972

[5] The effect of wrist position sense and tactile recognition on manual skills in patients with upper extremity neuropathy. Journal of Hand Therapy. 2025. DOI: 10.1016/j.jht.2024.12.005

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[7] Bifid median nerve entrapment by forearm musculature – a case report and systematic literature review. Journal of Hand Surgery (European Volume). 2025. DOI: 10.1177/17531934251401431

[8] Incidence of Carpal Tunnel Syndrome After the Diagnosis of Ulnar Neuropathy. Journal of Hand Surgery Global Online. 2026. DOI: 10.1016/j.jhsg.2026.100970

[9] Association of Ultrasound and Electrodiagnostic Studies in Patients Evaluated for Ulnar Neuropathy. The Journal of Hand Surgery. 2025. DOI: 10.1016/j.jhsa.2024.12.004

[10] CORR Insights®: Diagnosis of Mild-to-moderate Idiopathic Median Neuropathy at the Carpal Tunnel Based on Signs and Symptoms is Discordant From Diagnosis Based on Electrodiagnostic Studies and Ultrasound. Clinical Orthopaedics & Related Research. 2023. DOI: 10.1097/corr.0000000000002822

[12] Double entrapment neuropathy of the ulnar nerve at the elbow and the wrist : double crush syndrome?. BMC Musculoskeletal Disorders. 2024. DOI: 10.1186/s12891-024-07574-z

[13] The hand diagram: A novel outcome measure following supercharged end-to-side anterior interosseous nerve to ulnar nerve transfer in severe compressive ulnar neuropathy. Journal of Hand Therapy. 2024. DOI: 10.1016/j.jht.2023.09.005

[14] Is the anconeus epitrochlearis muscle a predictor for ulnar nerve compression?. Journal of Shoulder and Elbow Surgery. 2025. DOI: 10.1016/j.jse.2024.09.039

[15] Anterior interosseous nerve transfer combined with cubital and ulnar tunnel release for severe ulnar nerve compression. Journal of Hand Surgery (European Volume). 2025. DOI: 10.1177/17531934251381023

[16] Hiding in plain sight: A provider's educational guide to recognizing ulnar nerve compression. Journal of Hand Therapy. 2026. DOI: 10.1016/j.jht.2025.12.022

[17] The Human Disharmony Loop: A Case Series Proposing the Unique Role of the Pectoralis Minor in a Unifying Syndrome of Chronic Pain, Neuropathy, and Weakness. Journal of Clinical Medicine. 2025. DOI: 10.3390/jcm14051769

[18] Posttraumatic Compressive Neuropathy of the Deep Motor Branch of the Ulnar Nerve Caused by Heterotopic Ossification. Journal of Hand Surgery Global Online. 2024. DOI: 10.1016/j.jhsg.2024.02.001

[19] Predicting Acute Median Neuropathy in Perilunate Injuries. Journal of Hand Surgery Global Online. 2024. DOI: 10.1016/j.jhsg.2023.09.003

[20] Minimizing risk to the dorsal sensory branch of the ulnar nerve in wrist arthroscopy: an anatomical study. Journal of Hand Surgery (European Volume). 2025. DOI: 10.1177/17531934251321969

[22] Acute median nerve compression secondary to lacertus fibrosis syndrome following distal biceps tendon reconstruction: a case report. JSES Reviews, Reports, and Techniques. 2025. DOI: 10.1016/j.xrrt.2024.08.009

[23] CRITICAL APPRAISAL PAPER: “SENSORY INTERVENTIONS ON MOTOR FUNCTION, ACTIVITIES OF DAILY LIVING, AND SPASTICITY OF THE UPPER LIMB IN PEOPLE WITH STROKE: A RANDOMIZED CLINICAL TRIAL”. Journal of Hand Therapy. 2025. DOI: 10.1016/j.jht.2024.08.051

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[26] Green S Operative Hand Surgery. Relief of Pain.

[27] Compressive ulnar neuropathy owing to a tortuous ulnar artery proximal to Guyon’s canal. Journal of Hand Surgery (European Volume). 2025. DOI: 10.1177/17531934251329861

[29] Re: Tang JB. Primary versus secondary nerve compression neuropathy. J Hand Surg Eur. 2024, 49: 639–41. Journal of Hand Surgery (European Volume). 2024. DOI: 10.1177/17531934241262214

[30] Green S Operative Hand Surgery. A Practical Guide for Complex Regional Pain Syndrome in the Acute Stage and Late Stage > CRITICAL POINTS > Management of Patients With a Painful Median Nerve and Complex Regional Pain Syndrome.

[31] Green S Operative Hand Surgery. A Practical Guide for Complex Regional Pain Syndrome in the Acute Stage and Late Stage > Physical Examination.

[32] Green S Operative Hand Surgery. CLINICAL FINDINGS.

[33] Green S Operative Hand Surgery. Vascular Malformations.

[34] Green S Operative Hand Surgery. Median Nerve Compression at the Elbow and Forearm > COMPRESSION OF THE RADIAL NERVE > Superficial Radial Nerve Compression.

[35] Green S Operative Hand Surgery. NEUROMAS.

[36] Green S Operative Hand Surgery. A Practical Guide for Complex Regional Pain Syndrome in the Acute Stage and Late Stage > AUTHORS’ PREFERRED METHOD OF TREATMENT: COMMON NERVE–RELATED COMPLEX REGIONAL PAIN SYNDROME.

[37] Campbell S Operative Orthopaedics 4 Volume Set. NERVE INJURIES AT THE LEVEL OF THE HAND AND WRIST > NEUROVASCULAR ISLAND GRAFTS.

[38] Green S Operative Hand Surgery. TABLE 1.1 Characteristics of Commonly Used Drugs > REGIONAL ANESTHESIA > Contraindications.

[39] Green S Operative Hand Surgery. Median Nerve Compression at the Elbow and Forearm > Recurrent Cubital Tunnel Syndrome.

[40] A Lange Medical Book Current Diagnosis Treatment In Orthopedics Fifth Edition. 9Hand Surgery > DIAGNOSIS OF DISORDERS OF THE HAND.

[42] Green S Operative Hand Surgery. A Practical Guide for Complex Regional Pain Syndrome in the Acute Stage and Late Stage > Gate Theory of Pain.

[43] Green S Operative Hand Surgery. Median Nerve Compression at the Elbow and Forearm > Postoperative Care.

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