Abstract
The Murata-Chiba (MC) cup supporter is an innovative acetabular cup for treatment of protrusio acetabuli in patients with rheumatoid arthritis (RA) . Six hips of 5 RA patients who had undergone uncemented total hip arthroplasty (THA) using the MC cup supporter combined with autologous bone graft were investigated. The average follow-up period was 23 months (range: 12-29 months) . Clinical results, represented by JOA scores, were satisfac tory. Antero-posterior (AP) X-ray findings showed circumferential bone union after three months. There was no acetabular migration or case loosening. In light of these findings, the MC cup supporter used in conjunction with THA is a recommended operative method for treatment of the RA hip.
