title: Revision total hip arthroplasty using the Zweymuller femoral stem.
abstract: BACKGROUND
  A variety of femoral stem designs have been reported to be successful in revision total hip arthroplasty without consensus as to optimal design. We evaluated the clinical and radiographic outcomes in a consecutive series of femoral revisions using a wedge-shape, tapered-stem design at medium and long-term follow-up.
  
  
  METHODS
  We performed a retrospective review of clinical and radiographic outcomes of twenty-eight consecutive femoral revisions arthroplasties, which were done using the Zweymuller femoral stem.
  
  
  RESULTS
  The mean follow-up was 7.4 years (range 2-15 years). No stem re-revision was necessary. All stems were judged to be stable by radiographic criteria at the most recent follow-up. The final mean Harris hip score was 90. There was no difference in Harris hip scores, implant stability, or radiological appearance (distal cortical hypertrophy or proximal stress shielding) of the implants between medium-term (mean 5.7 years) and long-term (mean 12.4 years) follow-up.
  
  
  CONCLUSIONS
  We found the Zweymuller femoral stem design to be durable for revision hip arthroplasty when there is an intact metaphyseal-diaphyseal junction for adequate press-fit stability at surgery.
authors.affiliation: Department of Orthopedics and Rehabilitation, Yale University School of Medicine, P.O. Box 208071, New Haven, CT 06520, USA. matthew.oetgen@yale.edu
authors.forename: Matthew E
authors.initials: ME
authors.lastname: Oetgen
authors.forename: Michael H
authors.initials: MH
authors.lastname: Huo
authors.forename: Kristaps J
authors.initials: KJ
authors.lastname: Keggi