Finkelstein's test is used to diagnose DeQuervain's tenosynovitis in people who have wrist pain. To perform the test, the examining physician grasps the thumb and the hand is ulnar deviated sharply, as shown in the image. If sharp pain occurs along the distal radius (top of forearm, close to wrist; see image), DeQuervain's tenosynovitis is likely.
Some other doctors ask their patients to flex their thumb and clench their fist over the thumb followed by ulnar deviation for Finkelstein's test.
Read more about Finkelstein's Test: Purpose, Origin/Background, Method, Special Considerations/implications
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