title: Ten to twelve-year results with the Zweymüller cementless total hip prosthesis.
abstract: Between January 1987 and December 1990, 221 Zweymüller cementless total hip arthroplasties were performed in 211 patients with idiopathic osteoarthritis. A total of 136 patients (142 prostheses) were evaluated at a mean follow-up of 134 months (SD 9.5). The study group consisted of 78 Hochgezogen and 64 Stepless stem prostheses, all with a threaded titanium cup and ceramic head. No clinical and radiological differences were found between the 2 stem prostheses. Seven cups had been revised because of aseptic loosening; 17 cups showed radiolucent lines, osteolysis, or migration. Mean linear polyethylene wear of 105 (74%) cups was 0.46 mm (SD 0.27), with an annual wear of 0.04 mm (SD 0.02). Wear did not correlate with pain, cup migration, radiolucent lines, or osteolysis. Cumulative survival was 96%. Zweymüller cementless total hip arthroplasty showed good midterm results.
authors.affiliation: Department of Orthopaedic Surgery, Hospital Gooi-Noord, 1251 CH Laren (NH), The Netherlands.
authors.forename: Ton M J S
authors.initials: TM
authors.lastname: Vervest
authors.forename: Patricia G
authors.initials: PG
authors.lastname: Anderson
authors.forename: Freek
authors.initials: F
authors.lastname: Van Hout
authors.forename: Frits-Hein
authors.initials: FH
authors.lastname: Wapstra
authors.forename: Robert T
authors.initials: RT
authors.lastname: Louwerse
authors.forename: Juriaan W A
authors.initials: JW
authors.lastname: Koetsier
mesh_terms: D000368:Aged; D001843:Bone Cements; D002516:Ceramics; D019544:Equipment Failure Analysis / Q000706:statistics & numerical data; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000601:surgery*; D010014:Osteolysis / Q000000981:diagnostic imaging / Q000601:surgery; D011183:Postoperative Complications / Q000000981:diagnostic imaging* / Q000601:surgery; D011474:Prosthesis Design; D011859:Radiography; D012086:Reoperation; D014025:Titanium
chemical_list: D001843:Bone Cements; C070282:Ti-6Al-7Nb alloy; D014025:Titanium