Carpal Tunnel Syndrome

Entitlement Eligibility Guideline (EEG)

Date reviewed: 25 July 2025

Date created: February 2005

ICD-11 code: 8C10.0

VAC medical code: 35400 Carpal tunnel syndrome

This publication is available upon request in alternate formats.
 Full document – PDF Version


Definition

Carpal tunnel syndrome (CTS) is an entrapment neuropathy of the median nerve. The compression of the median nerve within the carpal tunnel of the wrist impairs sensation and can also affect the strength of the hand.

Note: CTS is distinct from other related disorders such as cumulative trauma disorders, repetitive strain injury of the wrist, or wrist tendinitis. These conditions, although occasionally sharing similar presentations, have different underlying causes from CTS and are considered separate medical conditions for entitlement purposes.


Diagnostic standard

Diagnosis by a qualified medical practitioner (orthopedic surgeon, plastic surgeon, neurologist, family physician), nurse practitioner, or physician assistant (within their scope of practice) is required.

Confirmation of CTS involves relevant investigations including electrophysiological testing, such as nerve conduction studies, and imaging assessments, such as ultrasound or magnetic resonance imaging (MRI) of the wrist.


Anatomy and physiology

The carpal tunnel is a narrow, anatomical passageway situated on the palm side of the wrist. It is formed by the wrist bones (carpal bones) on three sides and sealed by a strong band of connective tissue known as the transverse carpal ligament on the fourth side. This confined space accommodates the median nerve and the flexor tendons that bend the fingers (Figure 1: Carpal tunnel syndrome).

Originating from the brachial plexus in the neck, the median nerve traverses the arm and forearm to enter the hand through the carpal tunnel. It is crucial for providing sensation to the thumb, index, middle, and part of the ring fingers, in addition to supplying motor functions to the thumb's thenar muscles.

Inflammation or injury can lead to a reduction in the tunnel's space or an increase in its contents. This results in compression of the median nerve causing the sensory and motor disturbances characteristic of carpal tunnel syndrome.

Figure 1: Carpal tunnel syndrome

A close-up of carpal tunnel syndrome, showing a compressed median nerve. Also, showing the location of the median nerve. Source: Veterans Affairs Canada (2024).

The median nerve travels from the arm to the fingers through the carpal tunnel, providing sensation and motor control to parts of the hand. Inflammation can compress the nerve beneath the transverse carpal ligament at the wrist, leading to pain and functional issues in the hand and arm. Source: Veterans Affairs Canada (2024).

Clinical features

The clinical presentation of carpal tunnel syndrome (CTS) is marked by symptoms affecting the hand and wrist's function and comfort, largely due to compression of the median nerve within the carpal tunnel. Common symptoms include sharp or burning pain, a sensation of the hand 'falling asleep,' or experiencing 'pins and needles,' especially in the thumb, index, middle, and part of the ring fingers. These symptoms often worsen at night or upon waking, largely attributed to the flexed wrist position during sleep, increasing the pressure within the carpal tunnel.

A notable reduction in hand grip strength and challenges in performing precision-required tasks often lead to difficulties in handling objects securely. Advanced stages of CTS may lead to marked atrophy of the muscles of the base of thumb (thenar eminence ), crucial for hand operations.

Diagnostic procedures such as Phalen’s maneuver and Tinel’s sign are instrumental in reinforcing a CTS diagnosis, providing further clinical evidence.

It has been observed that CTS shows a higher prevalence among females, possibly due to anatomical differences such as a comparatively smaller carpal tunnel area. Furthermore, pregnancy has been identified as a significant risk factor for CTS, although the majority of cases tend to resolve within weeks to months post-partum.


Entitlement considerations

In this section

Section A: Causes and/or aggravation

Section B: Medical conditions which are to be included in entitlement/assessment

Section C: Common medical conditions which may result, in whole or in part from carpal tunnel syndrome and/or its treatment

Section A: Causes and/or aggravation

For VAC entitlement purposes, the following factors are accepted to cause or aggravate the conditions included in the Definition section of this EEG, and may be considered along with the evidence to assist in establishing a relationship to service. The factors have been determined based on a review of up-to-date scientific and medical literature, as well as evidence-based medical best practices. Factors other than those listed may be considered, however consultation with a disability consultant or medical advisor is recommended.

The timelines cited below are for guidance purposes. Each case should be adjudicated on the evidence provided and its own merits.

Factors

  1. Overuse: Performing any combination of forceful and/or repetitive activities with the affected hand or forearm for an average of at least eight hours per week for a cumulative period of at least six months before the clinical onset of CTS. If specified activities have ceased before the clinical onset or aggravation of CTS, then onset or aggravation must have occurred within 30 days of cessation.

    Note: Computer use of 28 hours or more per week may aggravate CTS; however, is not considered causative.

    Forceful means applying a substantial amount of force or pressure, using the muscles of the hand or forearm.

    Repetitive means performing the same or similar hand or forearm movements repeatedly over time.

    Specified activities include:

    1. Repetitive activities using the affected hand, involving either:
      • bending or twisting of the hand or wrist at least 50 times per hour; or
      • carrying out the same or similar movements in the hand or wrist at least 50 times per hour.
    2. Forceful activities generated by the affected hand. This force is applied through:
      • equivalent to lifting or carrying loads of more than three kilograms; or
      • involving lifting or carrying an object in the hand greater than one kilogram in excess of 10 times per hour.
    3. Activities where the affected hand or forearm is directly vibrated.
    4. Activities where the affected hand is used for weight-bearing.
    5. Activities requiring extended or extreme positions with excess wrist flexion or extension:
      • having a flexion/extension angle greater than 45 degrees for a substantial part of the day; or
      • ulnar deviation greater than 20 degrees for a substantial part of the day.

      Note: Holding an object in grip or pinch position with extreme posture is an exception, and requires that the position be held for most of the day.

  2. Experiencing an injury to the affected wrist, other than a wrist fracture, prior to clinical onset or aggravation of CTS. The injury would have had to:
    • alter the normal contour of the carpal tunnel; or
    • damage the median nerve or flexor tendons within the carpal tunnel; or
    • damage the forearm muscles forming the flexor tendons within the carpal tunnel.

    For the injury to cause or aggravate CTS, the symptoms of CTS must commence within several months of the injury.

  3. Experiencing a fracture to the affected wrist prior to clinical onset or aggravation of CTS. The wrist fracture would alter the normal contour of the carpal tunnel, or damage the median nerve or flexor tendons within the carpal tunnel. For the wrist fracture to cause or aggravate CTS, the symptoms must commence within several months of the fracture.
  4. Surgery to the affected wrist prior to clinical onset or aggravation of CTS. The surgery would have had to alter the normal contour of the carpal tunnel, or damage the median nerve or flexor tendons within the carpal tunnel. For the surgery to cause or aggravate CTS, symptoms must commence within several months of the surgery.
  5. Persons with end stage renal disease on hemodialysis prior to clinical onset or aggravation CTS. For hemodialysis to cause or aggravate CTS, it must take place for a period of at least one year immediately before clinical onset or aggravation of CTS. There is no direct evidence that peritoneal dialysis promotes CTS.
  6. Having diabetes mellitus at the time of clinical onset or aggravation of CTS. People living with diabetic polyneuropathy are at higher risk than diabetics without polyneuropathy.

    Note: For diabetes mellitus to cause or aggravate CTS, it must have existed for approximately five years immediately before the clinical onset or aggravation of CTS.

  7. Having edema involving the affected carpal tunnel at the time of clinical onset or aggravation of CTS. Edema involving the affected carpal tunnel may occur with external burns, fractures, lymphedema, myxedema and animal envenomation.
  8. Having rheumatoid arthritis involving the affected wrist prior to clinical onset or aggravation of CTS.
  9. Having gout of the affected wrist prior to clinical onset or aggravation of CTS.
  10. Having a space occupying lesion of the carpal tunnel prior to clinical onset or aggravation of CTS. The lesion situated within the affected carpal tunnel could include, but is not limited to the following:
    • hemangioma
    • neuroma of the median nerve
    • aneurysm of the median artery
    • calcification
    • synovial sarcoma
    • tendon sheath fibroma
    • lipoma and ganglion.
  11. Pregnancy prior to clinical onset or aggravation of CTS. While pregnancy may cause or aggravate CTS, CTS caused solely from a pregnancy is generally considered reversible within a few months of the completion of the pregnancy.
  12. Hyperthyroidism, including treated hyperthyroidism, at the time of clinical onset or aggravation of CTS.
  13. Inability to obtain appropriate clinical management of CTS.

Section B: Medical conditions which are to be included in entitlement/assessment

Section B provides a list of diagnosed medical conditions which are considered for VAC purposes to be included in the entitlement and assessment of carpal tunnel syndrome. No included medical conditions were identified at the time of the publication of this EEG.

Section C: Common medical conditions which may result, in whole or in part, from carpal tunnel syndrome and/or its treatment

No consequential medical conditions were identified at the time of the publication of this EEG. If the merits of the case and medical evidence indicate that a possible consequential relationship may exist, consultation with a disability consultant or medical advisor is recommended.


Related VAC guidance and policy:


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