Tendon versus Pyrocarbon Interpositional Arthroplasty in the Treatment of Trapeziometacarpal Osteoarthritis

Figure 3

Postoperative radiographic measurements. (a) Proximal migration of the first metacarpal bone (arrow) was measured as the distance between the distal articular surface of the scaphoid and the proximal articular surface of the first metacarpal bone. (b) Radiolucency around the implant (arrowhead) was measured between the edge of the implant and the most distant rim of the surrounding metacarpal bone or trapezium. (c) Implant migration () was measured based on divided quarters of the trapeziometacarpal joint and classified as centered, one-fourth displaced, one-half displaced, or greater than one-half displaced.

(a)

(b)

(c)

(d)