Two-year follow-up on joint stability and muscular function comparing rotating versus fixed bearing TKR.
Mobile and fixed bearing in total knee replacement are still discussed controversially. In a retrospective, matched-pair study, we investigated 40 patients with computer-assisted (BrainLAB) primary total knee replacement (PFC Sigma, DePuy) performed two years before. Twenty patients each received a mobile bearing and a fixed bearing. We compared Womac Score, Knee Society Score, postoperative ROM, fluoroscopic measurement of knee stability in flexion and extension and isokinetic muscle strength using a Biodex-3 dynamometer. Both groups showed similar results concerning WOMAC Score (total rotating bearing: 23.05; fixed bearing: 22.57), KSS (rotating bearing: 174.89; fixed bearing: 176.1). Isokinetic muscle force demonstrated statistically significant superior results for knee flexion in the rotating bearing group. Medio-lateral stability revealed statistically significant superior results for the rotating bearing compared to fixed bearing in extension (P>0.05). In flexion only lateral stability was superior (P>0.05). Two-year clinical follow-up after computer-assisted total knee replacement resulted in good clinical outcome with high patient satisfaction. Statistically significant better values for the rotating platform group were found for the medio-lateral stability in extension and the peak flexion torque.
Luring
C
C
Department of Orthopaedic Surgery, University of Regensburg, Kaiser-Karl-V. Allee 3, 93077, Bad Abbach, Germany. c_luering@yahoo.de
Bathis
H
H
Oczipka
F
F
Trepte
C
C
Lufen
H
H
Perlick
L
L
Grifka
J
J
D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D005260:Female; D005471:Fluoroscopy; D005500:Follow-Up Studies; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology* / Q000601:surgery; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D016555:Matched-Pair Analysis; D053580:Muscle Strength / Q000502:physiology; D053581:Muscle Strength Dynamometer; D017060:Patient Satisfaction; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D025321:Surgery, Computer-Assisted; D016896:Treatment Outcome