title: Failure of HA coating on a gritblasted acetabular cup: 155 patients followed for 7-10 years.
abstract: We report the outcome of 191 acetabular gritblasted titanium cups with a hemispherical design for press-fit insertion and coated with hydroxyapatite. The prosthesis was made of gritblasted titanium entirely coated with hydroxyapatite. 155 patients aged 15-78 years were operated on during the years 1991-1993 and followed for 7-10 years. During this period, 39 cups were revised because of mechanical loosening, a further 9 had radiolucent lines and 2 focal osteolysis. None of these 11 patients had clinical symptoms. Failure was associated with age, wear and radiolucency/osteolysis. At revision, we found that the soft tissues were discolored, and that most of the coating had disappeared. This design of hydroxyapatite-coated cups has a high rate of debonding and failure.
authors.affiliation: Surgical Department, Sophies Minde, Oslo Orthopaedic University Clinic, Norway. olav.reikeras@rikshospitalet.no
authors.forename: Olav
authors.initials: O
authors.lastname: Reikerås
authors.forename: Ragnhild B
authors.initials: RB
authors.lastname: Gunderson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods; D020099:Coated Materials, Biocompatible; D016001:Confidence Intervals; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D011336:Probability; D016016:Proportional Hazards Models; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D013997:Time Factors; D014025:Titanium
chemical_list: D020099:Coated Materials, Biocompatible; D014025:Titanium