AIM: The primary aim of this study is to analyse the long-term results of the third generation of the "Zweymüller" total hip arthroplasty (THA) comprising the SL-Plus Stem and the Bicon-Plus cup. METHODS: We evaluated 208 patients with a SL/Bicon-Plus primary THA (218 hips). Survival analysis was performed with a follow-up of 13 to 15 years. Complementary clinical and radiological analysis was performed using the "Hip Injury and Osteoarthritis Outcome Score" (HOOS) and x-rays of the hips. RESULTS: The probability of survival of the stem and cup with revision for any reason was respectively 0.96/0.97 at 10 years and 0.92/0.94 at 15 years. The probability of survival of the stem and cup with revision for aseptic loosening was respectively 0.99/0.97 at 10 years and 0.95/0.94 at 15 years. Clinical assessment of the patients, reported by the HOOS, were scored with a median for the subdivisions: symptoms 90%, pain 93%, function in daily activity 87%, function in leisure or sport 75%, and quality of life with 75%. Periprosthetic radiolucent lines were observed in half of all hips in Gruen zones 1 and 7. Mean linear wear of the polyethylene was 1.8 mm which corresponds to 0.12 mm/year. 2/3 of the hips show heterotopic ossifications, mostly Brooker type 1 and 2. CONCLUSIONS: The "third generation" Zweymüller total hip arthroplasty consisting of the SL stem and the Bicon cup has good long term results in terms of survival, clinical and radiological outcome.
AIM: The primary aim of this study is to analyse the long-term results of the third generation of the "Zweymüller" total hip arthroplasty (THA) comprising the SL-Plus Stem and the Bicon-Plus cup. METHODS: We evaluated 208 patients with a SL/Bicon-Plus primary THA (218 hips). Survival analysis was performed with a follow-up of 13 to 15 years. Complementary clinical and radiological analysis was performed using the "Hip Injury and Osteoarthritis Outcome Score" (HOOS) and x-rays of the hips. RESULTS: The probability of survival of the stem and cup with revision for any reason was respectively 0.96/0.97 at 10 years and 0.92/0.94 at 15 years. The probability of survival of the stem and cup with revision for aseptic loosening was respectively 0.99/0.97 at 10 years and 0.95/0.94 at 15 years. Clinical assessment of the patients, reported by the HOOS, were scored with a median for the subdivisions: symptoms 90%, pain 93%, function in daily activity 87%, function in leisure or sport 75%, and quality of life with 75%. Periprosthetic radiolucent lines were observed in half of all hips in Gruen zones 1 and 7. Mean linear wear of the polyethylene was 1.8 mm which corresponds to 0.12 mm/year. 2/3 of the hips show heterotopic ossifications, mostly Brooker type 1 and 2. CONCLUSIONS: The "third generation" Zweymüller total hip arthroplasty consisting of the SL stem and the Bicon cup has good long term results in terms of survival, clinical and radiological outcome.
Authors: Egbert J D Veen; Joost C M Schrier; Esther Van't Riet; Mark J Breslau; Alexander F W Barnaart Journal: Geriatr Orthop Surg Rehabil Date: 2016-03-24