title: Evaluation of a patient specific femoral alignment guide for hip resurfacing.
abstract: A novel alternative to conventional instrumentation for femoral component insertion in hip resurfacing is a patient specific, computed tomography based femoral alignment guide. A benchside study using cadaveric femora was performed comparing a custom alignment guide to conventional instrumentation and computer navigation. A clinical series of twenty-five hip resurfacings utilizing a custom alignment guide was conducted by three surgeons experienced in hip resurfacing. Using cadaveric femora, the custom guide was comparable to conventional instrumentation with computer navigation proving superior to both. Clinical femoral component alignment accuracy was 3.7° and measured within ± 5° of plan in 20 of 24 cases. Patient specific femoral alignment guides provide a satisfactory level of accuracy and may be a better alternative to conventional instrumentation for initial femoral guidewire placement in hip resurfacing.
authors.affiliation: Martin Orthopaedic Biomechanics Laboratory, St. Michael's Hospital, University of Toronto, B114 Li Ka Shing Knowledge Institute, Toronto, ON, Canada.
authors.forename: Michael
authors.initials: M
authors.lastname: Olsen
authors.affiliation: Department of Surgery, Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, ON, Canada.
authors.forename: Douglas D
authors.initials: DD
authors.lastname: Naudie
authors.affiliation: Department of Surgery, Division of Orthopaedic Surgery, St. Michael's Hospital, Toronto, ON, Canada.
authors.forename: Max R
authors.initials: MR
authors.lastname: Edwards
authors.affiliation: Martin Orthopaedic Biomechanics Laboratory, St. Michael's Hospital, University of Toronto, B114 Li Ka Shing Knowledge Institute, Toronto, ON, Canada.
authors.forename: Michael E
authors.initials: ME
authors.lastname: Sellan
authors.affiliation: Department of Surgery, Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, ON, Canada.
authors.forename: Richard W
authors.initials: RW
authors.lastname: McCalden
authors.affiliation: Department of Surgery, Division of Orthopaedic Surgery, St. Michael's Hospital, Toronto, ON, Canada.
authors.forename: Emil H
authors.initials: EH
authors.lastname: Schemitsch
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D017760:Bone Malalignment / Q000517:prevention & control; D002102:Cadaver; D005269:Femur / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008953:Models, Anatomic; D015207:Osteoarthritis, Hip / Q000601:surgery*; D025321:Surgery, Computer-Assisted; D014057:Tomography, X-Ray Computed
keywords: femoral alignment guide; hip resurfacing; patient specific instrumentation