title: Surface replacement of the hip can result in decreased acetabular bone stock.
abstract: BACKGROUND
  The recent interest in hip resurfacing arthroplasty is motivated by its potential advantages over THA. One advantage of hip resurfacing arthroplasty is that it conserves bone on the femoral side; however, it is unclear whether it does so on the acetabular side.
  
  
  OBJECTIVE
  We determined whether the amount of acetabular reaming and acetabular bone removal required for hip resurfacing arthroplasty is equal to, less than, or greater than that for THA.
  
  
  METHODS
  We prospectively evaluated the femoral neck size of 180 hips at the time of primary THA in an identical manner to when carrying out a hip resurfacing arthroplasty. Based on the femoral neck measurement, we determined the minimum cup size that would be used and reamer size required if the hip was undergoing a resurfacing. We compared this to the reamer size actually required to prepare the acetabulum for the THA cup. We calculated the difference between the predicted reaming size for resurfacing and the actual reaming size to determine the effect of resurfacing on acetabular bone stock.
  
  
  RESULTS
  Overall, 71%, 57%, and 41% of THAs would have had extra acetabular bone removed to implant a hip resurfacing arthroplasty cup with a line-to-line (0-mm), 1-mm, or 2-mm press fit, respectively.
  
  
  CONCLUSIONS
  When compared to THA, hip resurfacing arthroplasty commonly results in additional acetabular bone resection.
authors.affiliation: Division of Orthopaedic Surgery, McGill University, 1650 Cedar Avenue, Number B5159, Montreal, QC H3G 1A4, Canada. michael.tanzer@mcgill.ca
authors.forename: Michael
authors.initials: M
authors.lastname: Tanzer
authors.forename: Dylan
authors.initials: D
authors.lastname: Tanzer
authors.forename: Karen
authors.initials: K
authors.lastname: Smith
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001178:Arthroplasty / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods*; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation; D005260:Female; D005272:Femur Neck / Q000601:surgery; D006621:Hip Joint / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design; D011792:Quebec; D016896:Treatment Outcome; D055815:Young Adult