PURPOSE: The cause of ulnar drift in patients with rheumatoid arthritis (RA) is unknown. It may occur because of external forces applied to the fingers during normal use. Alternatively, it may arise after changes in the internal forces on the anatomy of the digits owing to alterations in the supporting structures of the joints or their control mechanisms, or both. Intrinsic muscle tightness, which is commonly seen in RA hands, may be the result of adaptive shortening or a direct consequence ...Expand abstract
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Muscle hypoxia in rheumatoid hands: does it play a role in ulnar drift?
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