抄録
Objective: The objective of this study was to evaluate the mid-term results of femoral revision hip arthroplasty with a fully porous, coated femoral stem.
Methods: After a mean follow-up of 6 years, we reviewed 58 femoral revision hip arthroplasties in which a fully porous, coated femoral stem was used. The Solution femoral stem (Depuy, Warsaw, IN, USA) was used in 25 hips and the Titanium Long (TL) femoral stem (Japan Medical Materials, Osaka, Japan) was used in the remaining 33 hips. Of the 58 hips, 13 (22%) had type II bone defects, 25 (43%) had type IIIA defects, 12 (21%) had type IIIB defects, and 8 (14%) had type IV defects.
Results: The mean Japanese Orthopaedic Association score for the entire series significantly improved from 46 points before the operation to 79 points after the operation. Thirteen hips (22%) showed grade 1 stress shielding, 19 (33%) showed grade 2, 8 (14%) showed grade 3, and 18 (31%) showed grade 4. However, 54 stems (93%) showed radiographic bone-ingrown fixation, 3 stems were fibrous stable, and 1 stem was unstable because of a deep infection.
Conclusion: The fixation obtained by using a fully porous, coated femoral stem is stable enough to get excellent clinical and radiographic results in femoral revision hip arthroplasty for patients with extensive bone defects.
