title: Effect of Taper Design on Trunnionosis in Metal on Polyethylene Total Hip Arthroplasty.
abstract: This study examines how taper design affects corrosion and fretting at the head trunnion surface. All hip prostheses retrieved between 1999 and 2013 with 28mm/+0 heads were selected, resulting in 44 cobalt-chrome-on-polyethylene implants, representing six taper designs. Mean implantation time: 8.9±3.7years. The femoral head tapers were scored for fretting and corrosion using the Goldberg scale as both a combined score and by three zones (apex, central and base). There was no difference in age (P=0.34), BMI (P=0.29), or implantation time (P=0.19) between taper groups. The 11/13 taper had the highest combined corrosion and fretting score, but no difference (P=0.22) between groups for combined scores (P=0.22 for corrosion, P=0.19 for fretting). In a zone-specific analysis, the 11/13 taper had highest corrosion score at base zone (P=0.02). Taper design had a significant effect on corrosion at base of trunnion.
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Sok Chuen
authors.initials: SC
authors.lastname: Tan
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada; Department of Medical Biophysics, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada; Surgical Innovation Program, Lawson Health Research Institute, London, Ontario, Canada.
authors.forename: Matthew G
authors.initials: MG
authors.lastname: Teeter
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Christopher
authors.initials: C
authors.lastname: Del Balso
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: James L
authors.initials: JL
authors.lastname: Howard
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Brent A
authors.initials: BA
authors.lastname: Lanting
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D002858:Chromium Alloys / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D003343:Corrosion; D005260:Female; D005270:Femur Head / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008670:Metals / Q000737:chemistry*; D008875:Middle Aged; D020959:Polyethylene / Q000737:chemistry*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D019415:Torque
chemical_list: D002858:Chromium Alloys; D008670:Metals; D003035:Cobalt; D020959:Polyethylene
keywords: metal-on-polyethylene; taper corrosion; taper design; total hip arthroplasty; trunnionosis