Ulnar deviation

Ulnar deviation, also known as ulnar drift, is a hand deformity in which the swelling of the metacarpophalangeal joints (the big knuckles at the base of the fingers) causes the fingers to become displaced, tending towards the little finger.

Ulnar deviation is likely to be a characteristic of rheumatoid arthritis,[2] more than of osteoarthritis.

[citation needed] Ulnar deviation is also a physiological movement of the wrist, where the hand including the fingers move towards the ulna.

Ulnar deviation is a disorder in which flexion by ulnar nerve innervated muscles is intact while flexion on the median nerve side is not.

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