Carpometacarpal (CMC) joint arthroplasty is a surgery to treat severe arthritis in the thumb. Doctors recommend it when other treatments, like braces or cortisone shots, no longer help with pain.

where the thumb meets the wrist. This joint, called the carpometacarpal (CMC) joint or the basilar joint, is important when trying to grip or pinch. Thumb arthritis is more common in women than ...