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 ...

“It’s not arthritis, it’s the CMC joint and the MCP joint, between those two,” Scherzer explained. “The way I grip my pitches, I really come down on that thumb, and my thumb gets blown ...

The base of the thumb—called the carpometacarpal joint, or CMC—is a common site for arthritis. Osteoarthritis (OA) can develop in the thumb. This condition gradually occurs from joint wear and ...