title: Wear rates of ceramic-on-ceramic bearing surfaces in total hip implants: a 12-year follow-up study.
abstract: A retrospective clinical and radiographic analysis was performed on 58 patients (60 hips; mean age at time of surgery, 45.2 years) at a minimum of 10-year follow-up (mean, 12.7 years) after total hip replacement using a ceramic-on-ceramic hearing total hip implant (Autophor, Smith and Nephew, Memphis, TN). Mean wear rate at final follow-up was 0.21 mim, averaging 0.016 mm/y. There were no cases of periprosthetic osteolysis in the acetabuulum or femur. For the unrevised components, there were 3 (5%) cases of protrusio acetabuli and 4 (7%) cases of acetabular component loosening. On the femoral side, 78.3% had distal pedestal formation, and 83% had greater than 2 mm implant-bone radiolucencies in more than 5 Gruen zones as a result of gross motion of the stem. Despite radiographic evidence of implant loosening, this hard bearing articulation functioned well in vivo for more than 12 years with remarkably low wear--approximately one tenth the rate reported for metal-on-polyethylene total hip bearings.
authors.affiliation: Musculoskeletal Research Center, Department of Orthopaedic Surgery, New York University-Hospital for Joint Diseases, New York 10003, USA.
authors.forename: L M
authors.initials: LM
authors.lastname: Jazrawi
authors.forename: E
authors.initials: E
authors.lastname: Bogner
authors.forename: C J
authors.initials: CJ
authors.lastname: Della Valle
authors.forename: F S
authors.initials: FS
authors.lastname: Chen
authors.forename: K I
authors.initials: KI
authors.lastname: Pak
authors.forename: S A
authors.initials: SA
authors.lastname: Stuchin
authors.forename: V H
authors.initials: VH
authors.lastname: Frankel
authors.forename: P E
authors.initials: PE
authors.lastname: Di Cesare
mesh_terms: D000328:Adult; D002516:Ceramics; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D012189:Retrospective Studies