All Alumina Articulation in the Stryker Howmedica-Osteonics THA A United States Experience 36–60 Months Follow-up
Five hundred fourteen total hip arthroplasties were performed in a prospective, randomized multicenter trial in the United States. All patients received a clinically proven hydroxyapatite (HA) coated, collarless, dual wedged titanium stem. While all acetabular shells had the same outside geometry, one third of the patients received a polyethylene liner mated with a Chrome Cobalt head and two thirds utilized a Ceramtec alumina acetabular bearing and femoral head. At the mean follow-up of 3.6 years, there were no statistical differences in the patient activity, satisfaction, or component performance. A 2.6% intraoperative insertional crack rate of the alumina liner resulted in an acetabular redesign with a second, non-randomized study of 209 additional hips. With a minimum of 24-month observation of this group, there have been no ceramic failures, and the clinical and radiographic results are not statistically different from the original control patients.
KeywordsTitanium Chrome Cobalt Polyethylene Liner
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