title: Evaluation of medial-lateral stability and functional outcome following total knee arthroplasty: results of a single hospital joint registry.
abstract: A precept of a successful total knee arthroplasty (TKA) would be a well balanced, stable knee. We analyzed the effects of medial-lateral (ML) stability on functional outcome at 2years post-operatively. Prospectively collected Joint Registry data of all unilateral primary TKAs between 2004 and March 2008 were used. ML stability (Group 1: <5°, Group 2: 6°-9°, Group 3: ≥10°) was assessed by 3 independent researchers. 1500 patients undergoing 1507 arthroplasties were divided into their various groups. Outcome assessment involved range of motion (ROM) and functional outcome, using the Knee Society Function Score (KSS), Oxford Knee Score (OKS) and SF-36 score. At 2years, Group 1 patients reported significantly higher KSS (P<0.001) and SF-36 scores. All groups had good post-operative ROM. A stable knee (ML stability <5°) post TKA is likely associated with significantly better functional outcome.
authors.affiliation: Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, Singapore.
authors.forename: Renyi Benjamin
authors.initials: RB
authors.lastname: Seah
authors.affiliation: Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, Singapore.
authors.forename: Seng Jin
authors.initials: SJ
authors.lastname: Yeo
authors.affiliation: Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, Singapore.
authors.forename: Pak Lin
authors.initials: PL
authors.lastname: Chin
authors.affiliation: Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, Singapore.
authors.forename: Andy K S
authors.initials: AK
authors.lastname: Yew
authors.affiliation: Department of Physiotherapy, Orthopaedic Diagnostic Centre, Singapore General Hospital, Outram Road, Singapore, Singapore.
authors.forename: Hwei Chi
authors.initials: HC
authors.lastname: Chong
authors.affiliation: Department of Orthopaedic Surgery, Singapore General Hospital, Outram Road, Singapore, Singapore.
authors.forename: Ngai Nung
authors.initials: NN
authors.lastname: Lo
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis* / Q000601:surgery; D007719:Knee Joint / Q000601:surgery*; D008297:Male; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011788:Quality of Life; D016059:Range of Motion, Articular; D020127:Recovery of Function; D012042:Registries; D016896:Treatment Outcome
keywords: arthroplasty; balancing; knee; medial-lateral; replacement; sagittal