Evaluation of clinical and radiologic results of THR using HA-coated femoral stem.

From Jan. 1991 to Dec. 1992, we carried out 177 cases of Total Hip Arthroplasty using hydroxyapatite-coated implants of 167 patients, and among thses, 153 cases in 144 patients were followed up more than 24 months. The implants used were 74 cases of Mallory-Head Hip system, 41 cases of Omnifit system and 38 cases of Profile system.

The average Harris Hip Score was 48.3 points preoperatively, 94.7 points at POD 1 year and 95.7 at POD 2 years. Seven patients(5.2%) complained thigh pain at POD 2 years. On the radiologic findings, cancellous condensation was noted around the hydroxyapatite coating region of femoral stem in 84 cases(54.2%), and radiolucent lines were noted at the non-coating region of distal stem in 102 cases(67.7%), but were less than 2mm and not progressive. There was no statistically significant differences among the groups of these three implants(P<0.05). Comments : This early result of femoral stems with hydroxyapatite-coating was quite satisfactory, however, long-term follow-up studies will be necessary.