title: Use of constrained acetabular components for hip instability: an average 10-year follow-up study.
abstract: The short-term efficacy of using constrained acetabular components for hip instability in the total hip arthroplasty construct has been documented. However, long-term concerns including late dislocation, loosening of components, and osteolysis have not been addressed. The authors evaluated, at an average 10.3-year follow-up, 101 tripolar constrained components (Stryker Howmedica Osteonics) used in the total hip arthroplasty construct. At final follow-up, 6 hips had dislocated or had failure of the constrained component, 5 of which were revised. In addition, 4 hips were revised for aseptic loosening of the acetabular component, 4 hips were revised for aseptic femoral loosening, and 1 hip was revised for acetabular osteolysis. Considering the complexity of the cases, this component has provided durable fixation and hip stability at this intermediate-term follow-up.
authors.affiliation: Department of Orthopaedic Surgery, Mayo Clinic, Rochester, Minnesota, USA.
authors.forename: Barron R B
authors.initials: BR
authors.lastname: Bremner
authors.forename: Devon D
authors.initials: DD
authors.lastname: Goetz
authors.forename: John J
authors.initials: JJ
authors.lastname: Callaghan
authors.forename: William N
authors.initials: WN
authors.lastname: Capello
authors.forename: Richard C
authors.initials: RC
authors.lastname: Johnston
mesh_terms: D000077:Acetabulum; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D007593:Joint Instability / Q000601:surgery*; D008297:Male; D011475:Prosthesis Failure; D012086:Reoperation