title: Defining the errors in the registration process during imageless computer navigation in total knee arthroplasty: a cadaveric study.
abstract: Computer assisted arthroplasty was introduced as a means to optimally align implants in order to improve function and longevity. The error during the manual registration of landmarks and its effect on component alignment was investigated in this study. Five fresh frozen lower limbs were used and the registration process was performed five times by five surgeons. The error range of the mechanical axis of the femur in the coronal plane was 5.2 degrees of valgus to 2.9 degrees of varus whilst the transepicondylar axis error was 11.1 degrees of external to 6.3 of internal rotation. Those figures suggest that the registration error alone can have a significant effect on the alignment of the implant.
authors: The Royal Orthopaedic Hospital NHS Foundation Trust, Northfield, Birmingham, UK.
authors: Edward T
authors: ET
authors: Davis
authors: The Royal Orthopaedic Hospital NHS Foundation Trust, Northfield, Birmingham, UK.
authors: Joseph
authors: J
authors: Pagkalos
authors: Gold Coast Hospital, Queens-land, Australia.
authors: Price A M
authors: PA
authors: Gallie
authors: Brisbane Private Hospital, Brisbane, Australia.
authors: Kelly
authors: K
authors: Macgroarty
authors: St Michael's Hospital, University of Toronto, Toronto, Ontario, Canada.
authors: James P
authors: JP
authors: Waddell
authors: St Michael's Hospital, University of Toronto, Toronto, Ontario, Canada.
authors: Emil H
authors: EH
authors: Schemitsch
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects* / Q000379:methods; D002102:Cadaver; D006801:Humans; D019300:Medical Errors; D025321:Surgery, Computer-Assisted / Q000009:adverse effects* / Q000379:methods
keywords: alignment; computer navigation; imageless navigation; registration error; total knee replacement