title: Intraoperative computer navigation parameters are poor predictors of function 1 year after total knee arthroplasty.
abstract: Intraoperative navigation data were collected prospectively for 134 knees undergoing cemented, posterior-stabilized total knee arthroplasty. Partial least squares regression analysis was used to test the association between patient demographics and intraoperative data collected with a computer-assisted navigation system (coronal alignment, ligament balance, range of motion, external tibiofemoral rotation) with 1-year outcomes (36-item Short-Form Health Survey, Oxford Knee Score, range of motion). Age at surgery displayed the largest coefficients of any other predictor. In contrast, navigation coefficients were variable in the strength and direction of their association with the outcome variables. Static knee alignment data obtained intraoperatively have limited capacity to explain the variance in functional outcome at 1 year. Although alignment and component position can be precisely measured intraoperatively, intrinsic patient factors remain dominant in determining the outcome.
authors: Sydney Orthopaedic Research Institute, Chatswood, NSW, Australia.
authors: Benjamin J
authors: BJ
authors: Widmer
authors: Corey J
authors: CJ
authors: Scholes
authors: Sébastien
authors: S
authors: Lustig
authors: Leonard
authors: L
authors: Conrad
authors: Sam I
authors: SI
authors: Oussedik
authors: David A
authors: DA
authors: Parker
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular; D025321:Surgery, Computer-Assisted; D016896:Treatment Outcome