title: Total Hip Arthroplasty Functional Outcomes Are Independent of Acetabular Component Orientation When a Polyethylene Liner Is Used.
abstract: BACKGROUND
  This study evaluated patient-reported outcomes in patients undergoing primary total hip arthroplasty with a polyethylene liner to determine the influence of cup orientation and other variables on patient-reported outcomes.
  
  
  METHODS
  A total of 477 cases were prospectively monitored through average 4.7 years follow-up. Cup position was measured on pelvis radiographs. Patients completed the Western Ontario and McMaster Universities Osteoarthritis Index and Short Form 12 Health Survey questionnaires.
  
  
  RESULTS
  Average cup abduction was 43.1° ± 7.5° and anteversion was 13.3° ± 7.5°. Three hundred cups were within the target zone. All outcomes' improvement from baseline and cup position was not an independent risk factor for the Western Ontario and McMaster Universities Osteoarthritis Index or Short Form 12 Health Survey improvement.
  
  
  CONCLUSIONS
  Accurate cup orientation may not be critical to maximizing patient-perceived outcomes if the combined anteversion is within a normal range, the hip joint is properly balanced, and a polyethylene liner is coupled with a metal or ceramic femoral head.
authors.affiliation: Center for Hip & Knee Replacement, Department of Orthopaedic Surgery, New York Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Jacob T
authors.initials: JT
authors.lastname: Bobman
authors.affiliation: Center for Hip & Knee Replacement, Department of Orthopaedic Surgery, New York Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Jonathan R
authors.initials: JR
authors.lastname: Danoff
authors.affiliation: Center for Hip & Knee Replacement, Department of Orthopaedic Surgery, New York Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Oladapo M
authors.initials: OM
authors.lastname: Babatunde
authors.affiliation: Center for Hip & Knee Replacement, Department of Orthopaedic Surgery, New York Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Kaicen
authors.initials: K
authors.lastname: Zhu
authors.affiliation: Center for Hip & Knee Replacement, Department of Orthopaedic Surgery, New York Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Katie
authors.initials: K
authors.lastname: Peyser
authors.affiliation: Center for Hip & Knee Replacement, Department of Orthopaedic Surgery, New York Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Geller
authors.affiliation: Department of Biostatistics, Columbia University, New York, New York.
authors.forename: Prakash
authors.initials: P
authors.lastname: Gorroochurn
authors.affiliation: Center for Hip & Knee Replacement, Department of Orthopaedic Surgery, New York Presbyterian Hospital/Columbia University Medical Center, New York, New York.
authors.forename: William
authors.initials: W
authors.lastname: Macaulay
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D005270:Femur Head / Q000601:surgery; D005500:Follow-Up Studies; D006621:Hip Joint / Q000601:surgery; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020959:Polyethylene
chemical_list: D020959:Polyethylene
keywords: acetabulum; cup orientation; functional outcomes; safe zone; total hip arthroplasty