Article

Two-year follow-up on joint stability and muscular function comparing rotating versus fixed bearing TKR.

Department of Orthopaedic Surgery, University of Regensburg, Kaiser-Karl-V. Allee 3, 93077, Bad Abbach, Germany.
Knee Surgery Sports Traumatology Arthroscopy (impact factor: 2.21). 08/2006; 14(7):605-11. DOI:10.1007/s00167-005-0020-7
Source: PubMed

ABSTRACT 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.

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Keywords

176.1). Isokinetic muscle force
 
40 patients
 
computer-assisted total knee replacement
 
fixed bearing
 
good clinical outcome
 
knee stability
 
matched-pair study
 
Medio-lateral stability
 
mobile bearing
 
P>0.05). Two-year clinical follow-up
 
peak flexion torque
 
PFC Sigma
 
postoperative ROM
 
rotating bearing
 
rotating bearing group
 
rotating platform group
 
similar results
 
statistically significant superior results
 
total knee replacement
 
total rotating bearing