title: A cementless hip system with a new surface for osseous integration.
abstract: OBJECTIVE
  The failure of total hip systems caused by wear-particle-induced loosening has focused interest on factors potentially affecting wear rate. Remnants of the blasting material were reported on grit-blasted surfaces for cementless fixation. These particles are believed to cause third-body wear and implant loosening. The purpose of this study was to evaluate the early clinical and radiological outcomes of a cementless hip system with a new, contamination-free, roughened surface with regard to prosthesis-related failures.
  
  
  METHODS
  Between May 2004 and March 2009, 202 consecutive primary total hip arthroplasties (THAs) (192 patients with a mean age of 62.6 years) were performed using a cementless stem (Hipstar®) and a hemispherical acetabular cup (Trident®).
  
  
  RESULTS
  At a minimum follow-up of two years, five revisions (2.5%) due to aseptic loosening of the stem and three (1.5%) of the cup were necessary. The cumulative rate of prostheses survival, counting revision of both components and with aseptic failure as end point, was 92.9% at 8.8 years. Radiolucent lines up to three millimetres were evaluated in the proximal part of the femur in 61% of cases.
  
  
  CONCLUSIONS
  Although the incidence of radiolucent lines was decreased, the revision rate was considerably increased compared to other uncemented hip implants with grit-blasted surfaces in the short- to mid-term follow-up of our study. Subsequent studies are needed to confirm whether these changes in implant material and surface affect the radiological and clinical outcome in the long term.
authors.affiliation: Department of Orthopaedics and Orthopaedic Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria, richard.lass@meduniwien.ac.at.
authors.forename: Richard
authors.initials: R
authors.lastname: Lass
authors.forename: Alexander
authors.initials: A
authors.lastname: Kolb
authors.forename: Gobert
authors.initials: G
authors.lastname: Skrbensky
authors.forename: Georg
authors.initials: G
authors.lastname: Reinisch
authors.forename: Bernd
authors.initials: B
authors.lastname: Kubista
authors.forename: Alexander
authors.initials: A
authors.lastname: Giurea
authors.forename: Reinhard
authors.initials: R
authors.lastname: Windhager
authors.forename: Rainer
authors.initials: R
authors.lastname: Kotz
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D002484:Cementation; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation