Hydroxyapatite-Coated Threaded Acetabular Prostheses. A Five-Year Follow-Up Radiographic Study

Abstract

We have reviewed 83 consecutive cementless Furlong hydroxyapatite (HA)-coated threaded acetabular components which were inserted in 75 patients. The mean age of the patients at the operation was 54 years (range 31 to 67 years) and the mean follow-up period was 61 months (range 40 to 82 months). Large size gaps at the implant -bone interface (attributed to failure to achieve bone-prosthesis contact), were present in 89% of the cases on the initial radiographs. At the last follow-up, the gaps were either no longer visible or had decreased in 95% of the cases. Radiolucencies were absent in well-fixed components. Three acetabular components were considered to be loose and are awaiting revision, giving a 3.6% aseptic loosening rate. The remainder of the cups were radiographically stable with positive evidence of bone ingrowth and no signs of impending loosening.