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Finkelsteins test 

Finkelsteins test is used to diagnose De Quervain's tenosynovitis in people who have wrist pain. 

  • To perform the test, the patient makes a fist with the thumb inside the fingers.
  • The examiner stabilizes the forearm and deviates the wrist toward the ulnar side.
  • A positive test is shown by pain over the abductor pollicis longus and extensor pollicis brevis tendons at the wrist and is suggestive of a paratenonitis of these two tendons.

Relevant anatomy:

The Abductor Pollicis Longus Muscle

The abductor pollicis longus muscle assists in bending the thumb, and with it the wrist outward when the palm faces forward. It arises a little above mid shaft along the back of the radius and the interosseous membrane to merge into a tendon that inserts on the base of the first metacarpal, the bone that forms the base of the thumb.

 

The Extensor Pollicis Brevis Muscle

The extensor pollicis brevis muscle both extends the thumb and assists in bending the wrist outward. It arises on the back side of the radius and the interosseous membrane, wraps around to the inside of the radius, and courses downward as a tendon to insert at the base of the first phalanx of the thumb.