INTERPHALANGEAL JOINT REPLACEMENT

摘要

First and second element (13, 15) that have mating heads (19, 31) form an interphalangeal joint prosthesis (11) that allows smooth articulation dorsal to volar. The first element head (19) has a proximal surface (23) defined by two intersecting planes, a stem portion (17) that extends longitudinally therefrom and a convex bicondylar articulating surface (21) having a central valley (27). The second element (15) has a biconcave articulating proximal surface which mates with the first element articulating surface (43) and a stem portion (33) that extends longitudinally from the distal surafce thereo f, with a notch (41) being formed in a dorsal surface of the head (31) at a location that does not disturb attachments to the dorsal tubercle or the function of the median band of the extensor expansion. Sets of such joint prostheses of varying sizes are provided which are designed so that adjacent sizes interfit. A method for treating a deteriorated PIP joint is described.