Abstract
IntroductionThe purpose of this study was to compare the effects of two ways of establishing the flexion gap on the flexion angle and flexion-extension motion after posterior-stabilized （PS） prosthesis. A way for the posterior slope angle（PSA）and posterior condylar offset（PCO）were greater than preoperative, another for less than preoperative.Materials and MethodsThey are grouped according to the way flexion gaps are constructed. Data from 28 total knee arthroplasty（TKA）patients treated with propensity score match (PSM) were included. The difference of flexion angle and flexion-extension motion between the two groups was compared, and the influence of PCO and PSA on the flexion angle in the two ways was analyzed.ResultsPostoperative flexion degree of the two groups was 115.50±14.64° and 112.29±10.64° (P =0.553), and there was no statistical significance. Postoperative flexion-extension motion grade data of the decrease group was better than that of the increased group (P =0.031). Postoperative flexion angle was negatively correlated with PCO change in the increase group (r²=0.574 b '=-0.758 p=0.002).ConclusionsIncreasing the PSA and PCO to construct flexion gaps in PS TKA will cause problems with flexion-extension movements. It may be more reasonable to avoid excessive PSA and select appropriate PCO to reconstruct the flexion gap in PS prosthetic.
Flexion gap stabilization by oversizing posterior condylar offset in deep-dished total knee replacement does not compromise flexion: A single-surgeon, retrospective, observational, mid-term series
