Carpometacarpal (CMC) joint arthroplasty is a surgery used to treat thumb arthritis when other treatments fail. The procedure involves removing the trapezium, a small wrist bone that supports the ...

(a) Oblique radiograph of the left thumb demonstrating dorsal subluxation of the first metacarpal bone at the basal joint. (b) Restoration of alignment at the first carpometacarpal joint is seen ...