Extensively Hydroxyapatite-Coated Stems in Revision Hip Arthroplasty: A Radiological Mid-Term follow-up Study

Femoral revision surgery involves the placement of a stable stem and the regeneration of the damaged bone structure. We retrospectively reviewed 36 cases of femoral revision surgery in which an extensively hydroxyapatite-coated porous stem was implanted with a five-year minimum follow-up. Nine of the cases had type I defects, 12 had type II defects, six had III-A defects and nine had III-B defects. The mean follow-up was 7.7 years (range 5–11). No cases of revision surgery, subsidence or displacement were detected. In 35 cases the integration of the stem had been achieved, the bone structure had been restored and there was no fibrous interface visible between the implant and the bone. The fully hydroxyapatite-coated stems thus proved a valuable alternative for femoral revision surgery in mild and moderate bone defects.