No difference between standard and high flexion cruciate retaining total knee arthroplasty: a prospective randomised controlled study
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The purpose of this prospective, randomised, double-blind study was to test the hypotheses that patients with high-flexion total knee arthroplasty (TKA) have (1) a wider/greater range of motion (ROM) post-operatively and (2) higher levels of knee society score (KSS) and WOMAC score post-operatively compared to standard TKA.
In this study, 28 high flexion with 31 standard TKAs were compared. We measured ROM, pre-operatively, on day 3, 7, 28, and after 6 and 36 months post-operatively as well as KSS and WOMAC score pre-operatively, on day 28 and after 6 and 36 months post-operatively.
No statistically significant differences were found between both groups with regard to the target parameters. The mean ROM was 113° (range 80°–140°, SD 13.4°) in the control group (standard TKA) and 117° (range 90°–140°, SD 12.3) in the study group (high-flexion TKA) at 36 months follow-up [p = not significant (n.s.)]. The KSS pre-operatively was 38.2 (range 8–64, SD 15.8) in the control group and 45.9 (range 8–74, SD 16.0) in the study group (n.s.) increasing to 157.6 in the control group and 156.7 in the study group (p = n.s) at 36 months follow-up.
This study could not confirm significant benefits of high-flexion TKA compared to standard TKA with regard to ROM and higher levels of KSS and WOMAC score.
Level of evidence
KeywordsHigh-flexion total knee arthroplasty Range of motion Total knee arthroplasty Randomised controlled trial
Conflict of interest
The authors declare that they have no conflict of interest.
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