Yasushi Morisawa, Atsushi Yoshida and Shinichiro Takayama
A case of rheumatoid thumb carpometacarpal (CMC) arthritis with advanced osteolysis is reported. Although CMC joint arthrodesis was performed, bone union was not achieved, and pain and instability persisted. Therefore, first and second metacarpal bone fusion was performed with satisfactory results. While CMC joint arthrodesis or arthroplasty is typically performed, first and second metacarpal bone fusion appears to be a useful treatment option when there is marked osteolysis.