ulnar drift

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.

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radial drift  see under deviation.

ulnar drift  see under deviation.

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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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drift [drift]

1. slow movement away from the normal or original position.

2. a chance variation, as in gene frequency from one generation to another; the smaller the population, the greater are the random variations.

antigenic drift relatively minor changes in the antigenic structure of a virus strain, probably resulting from natural selection of variants circulating among an immune or partially immune population. See also antigenic shift.

ulnar drift ulnar deviation.