Durkan Test

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 Durkan Test


What is Durkan’s test of hand?

Durkan Test or as it called the carpal compression test is used to test for Carpal Tunnel Syndrome CTS where the median nerve is compressed in the carpal tunnel of the wrist. It was first described by JA Durkan in 1991.

See Also: Carpal Tunnel Syndrome

How do you perform a carpal compression test (durkan test)?

Durkan Test
Durkan Test (carpal compression test)

What does a positive Durkan Test mean?

Sensitivity & Specificity

A study by M Richter found that the Durkan Test or Carpal Compression Test has a high value of clinical diagnosis in Carpal Tunnel Syndrome:

This study also found that the combination of Phalen test with Durkan’s test has a sensitivity of 94% and a specificity of 96%, thus equalling the respective values for electrophysiological testing (nerve conduction velocity, EMG) which so far is regarded as the golden standard diagnostic test for Carpal Tunnel Syndrome.

See Also:  Phalen Test 

Related Anatomy

The median nerve innervates the skin of the palmar (volar) side of the index finger, thumb, middle finger, and half the ring finger, and the nail bed.

The flexor retinaculum (transverse carpal ligament) spans the region between the pisiform, hamate, scaphoid, and trapezium, transforming the carpal arch into a tunnel, through which the median nerve and some of the tendons of the hand pass.

The proximal attachment of the retinaculum is at the tubercle of the scaphoid and the pisiform. The hook of the hamate and the tubercle of the trapezium serve as its distal attachment.

The retinaculum also:

  1. serves as an attachment site for the thenar and hypothenar muscles;
  2. helps maintain the transverse carpal arch;
  3. acts as a restraint against bowstringing of the extrinsic flexor tendons,
  4. protects the median nerve.

The structures that pass deep to the flexor retinaculum include:

  1. flexor digitorum superficialis (FDS),
  2. flexor digitorum profundus (FDP),
  3. flexor pollicis longus (FPL),
  4. flexor carpi radialis (FCR).

The structures that pass superficial to the flexor retinaculum include:

  1. the ulnar nerve and artery,
  2. the tendon of the palmaris longus.
  3. the sensory branch (anterior (palmar) branch) of the median nerve.

The carpal tunnel serves as a channel for the median nerve and nine flexor tendons. The floor of the tunnel is formed by the anterior (palmar) radiocarpal ligament and the anterior(palmar) ligament complex. As mentioned previously, the roof of the tunnel is formed by the flexor retinaculum. The radial and ulnar are formed by carpal bones (hook of hamate and trapezium , respectively). The median nerve divides into a motor branch and distal sensory branches within the tunnel.

carpal tunnel
Carpal Tunnel Anatomy

Carpal Tunnel Syndrome:

This condition occurs most commonly in women in the 30–60-year age group.

Causes of Carpal Tunnel Syndrome with stenosis from increased pressure within the tunnel include:

  1. Local inflammatory processes such as rheumatoid arthritis.
  2. Previous fractures of the base of the radius or carpal bones.
  3. Tenosynovitis of the long tendons.
  4. Mechanical overuse in the workplace or in sports activities.
  5. Metabolic disorders such as gout, diabetes mellitus, and amyloidosis.
  6. Hormonal changes (such as in pregnancy) can also lead to Carpal Tunnel Syndrome CTS because of swelling within the carpal tunnel.
  7. It is sometimes seen in association with myxoedema, acromegaly.

Symptoms and signs of Carpal Tunnel Syndrome include:

  1. Night time paresthesia and brachialgia are typical symptoms of nerve compression
  2. patients awaken because of pain in the middle of the night a few hours after falling asleep.
  3. Other signs include morning stiffness and persistent sensory.
  4. At a later stage, motor deficits in the region supplied by the median nerve, with atrophy of the thenar musculature and loss of strength when making a fist.
  5. Pinching with thumb and fingers is weak or impossible.

Differential diagnosis should consider the following:

  1. Cervical spinal cord and brachial plexus lesions.
  2. Pronator teres syndrome.
  3. Compression neuropathy in Guyon’s canal.
  4. Thoracic outlet syndrome.
  5. Osteoarthritis of the first carpometacarpal joint.
median nerve distribution
Median Nerve Distribution

Reference

  1. M Richter, P Brüser. [Value of clinical diagnosis in Carpal Tunnel Syndrome]. Handchir Mikrochir Plast Chir
    . 1999 Nov;31(6):373-6; discussion 377. doi: 10.1055/s-1999-13555. PMID: 10637726
  2. Durkan, J.A. (1991), “A new diagnostic test for carpal tunnel syndrome”The Journal of Bone and Joint Surgery73 (4): 535–538, archived from the original on 2010-03-05, retrieved 2010-05-04
  3. Campbel’s Operative Orthopaedics 13th Edition Book
  4. Clinical Tests for the Musculoskeletal System, Third Edition Book
  5. Millers Review of Orthopaedics, 7th Edition Book.
  6. Clinical Orthopaedic Examination, Ronald McRae 6th Edition.



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