Acetabular Reconstruction for RA Hip with Bone Graft Alone or Bone Graft with Hydroxyapatite

Bipolar hip arthroplasty for treatment of the rheumatoid hip with acetabular bone defects was performed on 14 joints in 10 cases. For acetabular reconstruction, bone graft alone was needed on 9 joints in 6 cases (BG group) and bone graft with hydroxyapatite granules was needed on 5 joints in 4 cases (HA group).Radiological progression of migration of the outer head was examined in both groups by X-p films and compared.Within 1 year after surgery central and upper migration of the outer head was larger in the HA than in the BG group. But, no significant progress was seen after the second post-operative year.