[Etiology of ulnar drift of the metacarpophalangeal joint in rheumatoid arthritis].
D001172:Arthritis, Rheumatoid / Q000150:complications*; D003286:Contracture / Q000150:complications; D005385:Fingers; D006227:Hand Deformities, Acquired / Q000209:etiology*; D006801:Humans; D009068:Movement; D014457:Ulna