title: Outcome of a modular head-neck adapter system in revision hip arthroplasty.
abstract: OBJECTIVE
  Revision hip arthroplasty using a modular head-neck adapter gives the possibility of keeping a well-fixed femoral component while revising the acetabular prosthesis or femoral head and adapt leg length and femoral offset to the individual anatomy intraoperatively. The success of this kind of surgery is still unclear due to the lack of medium- to long-term follow-up. Therefore, we analyzed the clinical and radiological outcome of the modular Merete BioBall© adapter system in revision hip surgery.
  
  
  METHODS
  In this retrospective study, we included 95 consecutive patients with a Merete BioBall© adapter system implanted during revision hip arthroplasty. The average follow-up was 52.5 months. For clinical evaluation, we used the Harris Hip Score. The health-related quality of life was determined with the visual analog pain scale.
  
  
  RESULTS
  The surgeries were performed 97 months after prior hip arthroplasty on average. The main indications for the Merete BioBall© adapter system were dislocation, acetabular loosening, and wear. In the clinical outcome, patients achieved 80.9 points in the Harris Hip Score. The mean level of persisting pain was 1.4 (VAS). The overall survival of the Merete BioBall© system in revision hip arthroplasty revealed 92.8 % survival at 8.17 years follow-up with a repeat revision rate of 5.2 %.
  
  
  CONCLUSIONS
  Performing revision hip arthroplasty using the Merete BioBall
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany. m-hoberg.klh@uni-wuerzburg.de.
authors.forename: Maik
authors.initials: M
authors.lastname: Hoberg
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Konrads
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany.
authors.forename: Simon
authors.initials: S
authors.lastname: Huber
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Reppenhagen
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Walcher
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany.
authors.forename: André
authors.initials: A
authors.lastname: Steinert
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Barthel
authors.affiliation: Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, University of Wuerzburg, Brettreichstr. 11, 97074, Würzburg, Germany.
authors.forename: Maximilian
authors.initials: M
authors.lastname: Rudert
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D005270:Femur Head / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery*; D011474:Prosthesis Design; D011788:Quality of Life; D012086:Reoperation; D012189:Retrospective Studies
keywords: Head–neck adapter; Hip revision arthroplasty; Merete BioBall; Modular; Outcome