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ulnar drift

   Also found in: Dictionary/thesaurus, Legal, Encyclopedia, Wikipedia 0.03 sec.
drift (drift)
1. slow movement away from the normal or original position.
2. a chance variation, as in gene frequency between populations; the smaller the population, the greater are the chance random variations.

radial drift  see under deviation.
ulnar drift  see under deviation.

ulnar drift
Etymology: L, ulna, elbow; AS, drifan, to drive
a change in the metacarpophalangeal joints because of rheumatoid arthritis and chronic synovitis. The long axis of the fingers makes an angle with the long axis of the wrist so that the fingers are deviated to the ulnar side of the hand. Also called ulnar deviation.


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