Six-year results of hydroxyapatite-coated total hip replacement

• Published in: Journal of bone and joint surgery. British volume Vol. 77; no. 4; pp. 534 - 547
• Main Authors: GEESINK, R. G. T, HOEFNAGELS, N. H. M
• Format: Journal Article
• Language: English
• Published: London British Editorial Society of Bone and Joint Surgery 01-07-1995
• Subjects: Adult; Aged; Biological and medical sciences; Bone Density; Bone Remodeling; Evaluation Studies as Topic; Female; Hip Prosthesis; Humans; Hydroxyapatites; Male; Medical sciences; Middle Aged; Orthopedic surgery; Osteoarthritis, Hip - surgery; Postoperative Complications; Prosthesis Design; Retrospective Studies; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Treatment Outcome; Human; Coating material; Prognosis; Non cimented prosthesis; Diseases of the osteoarticular system; Hydroxyapatite; Joint; Long term; Hip; Plasty; Surgery; Complication; Biomaterial
• ISSN: 0301-620X; 2044-5377
• DOI: 10.1302/0301-620x.77b4.7615595

We present the 5.6- to 7.6-year results of our first 118 hydroxyapatite (HA)-coated total hip replacements in patients under 66 years of age. The titanium femoral component has proximal HA coating and was usually articulated with an HA-coated threaded cup. The HA coating of 50 microns thickness has a porosity of below 3%, 97% HA purity and 65% crystallinity. The survival rate at a mean of six years was 100% for the HA-coated stems and 99% for the HA-threaded cups. The average Harris hip score at one year was 96, and at three years and thereafter 98. There was a very low incidence of early pain after surgery. Serial radiographs showed rapid bony integration of implants with evidence of bone apposition on the coating within six months. By Engh's criteria, all the femoral components had confirmed bone ongrowth after three years. We found no deterioration of results with time, and consider that our clinical and radiological results show that HA coatings can provide early pain relief and durable implant fixation.