title: Ten to fifteen-year clinical and radiographic follow-up with a third-generation cementless stem in a young patient population.
abstract: OBJECTIVE
  Outcome data beyond 11 years of follow-up is not available for the third-generation Zweymüller femoral stem in combination with a polyethylene bearing. We report ten to 15-year results with this total hip arthroplasty (THA) combination in a young population.
  
  
  METHODS
  A retrospective, observational, non-randomised, single-centre, clinical observational study was conducted in which 311 primary THAs were performed in 276 patients between 1996 and 2000 using a third-generation Zweymüller stem. The mean age of the patients at operation was 47.4 years (range 18-77 years).
  
  
  RESULTS
  Stem survival for any reason was 93.5% after ten years and 89.6% after 13 years, and the probability of aseptic stem loosening was 98.7% at both ten and 13 years. The occurrence of femoral radiolucent lines was low, at just 17.2%. Minor femoral osteolysis was identified in 30% of patients and was attributed to polyethylene liner wear. Clinical and patient satisfaction outcomes were in line with previous investigations, and the rate of adverse events was low.
  
  
  CONCLUSIONS
  The third-generation Zweymüller stem shows good radiographic and clinical results and good longevity, including in the younger osteoarthritic patient. The use of low-wear bearings may further reduce the rate of osteolysis and wear-related revision in young and active patients.
authors.affiliation: Department of Orthopaedic Surgery, Riga Stradins University, Latvian State Hospital of Traumatology and Orthopaedics, Duntes iela 12/22, Riga, Latvia. peteris.studers@tos.lv.
authors.forename: Peteris
authors.initials: P
authors.lastname: Studers
authors.affiliation: Department of Orthopaedic Surgery, Riga Stradins University, Latvian State Hospital of Traumatology and Orthopaedics, Duntes iela 12/22, Riga, Latvia.
authors.forename: Danils
authors.initials: D
authors.lastname: Belajevs
authors.affiliation: Department of Orthopaedic Surgery, Riga Stradins University, Latvian State Hospital of Traumatology and Orthopaedics, Duntes iela 12/22, Riga, Latvia.
authors.forename: Vitolds
authors.initials: V
authors.lastname: Jurkevics
authors.affiliation: Department of Orthopaedic Surgery, Riga Stradins University, Latvian State Hospital of Traumatology and Orthopaedics, Duntes iela 12/22, Riga, Latvia.
authors.forename: Peteris
authors.initials: P
authors.lastname: Likums
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation*; D001672:Biocompatible Materials; D001843:Bone Cements; D005260:Female; D006085:Graft Survival; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000601:surgery*; D017060:Patient Satisfaction; D020959:Polyethylene; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D001672:Biocompatible Materials; D001843:Bone Cements; D020959:Polyethylene
keywords: Long-term outcome; Osteoarthritis; Survival analysis; Total hip replacement