Changes in the functional flexion axis of the knee before and after total knee arthroplasty using a navigation system.
Long term satisfaction of patients with total knee arthroplasty (TKA) has lagged behind that of total hip arthroplasty. One possible reason is the failure of the artificial joint to recreate natural kinematics of the knee. This study evaluated the pre and post implant functional flexion axis in the knees of 285 total knee arthroplasty patients using a surgical navigation system. Results showed that post-implant there was less femoral rollback early in flexion on the lateral side of the joint than pre-implant. Designing future generations of knee implants to allow for this motion may give patients a more 'natural' feeling knee and may benefit outcomes.
School of Biomedical Engineering, Dalhousie University, Halifax, Canada; Department of Surgery, Dalhousie University, Halifax, Canada.
David A J
DA
Wilson
School of Biomedical Engineering, Dalhousie University, Halifax, Canada.
Janie L
JL
Astephen Wilson
Department of Surgery, Dalhousie University, Halifax, Canada.
Glen
G
Richardson
School of Biomedical Engineering, Dalhousie University, Halifax, Canada; Department of Surgery, Dalhousie University, Halifax, Canada.
Michael J
MJ
Dunbar
D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods*; D001696:Biomechanical Phenomena; D005260:Female; D005269:Femur / Q000601:surgery*; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D016896:Treatment Outcome
arthroplasty; functional flexion axis; helical axis; kinematics; knee