The aim of this study was to evaluate whether achieving medial joint opening, as measured by the change in the joint line convergence angle (∆JLCA), is a better predictor of clinical outcomes after high tibial osteotomy (HTO) compared with the mechanical axis deviation, and to find individualized targets for the redistribution of load that reflect bony alignment, joint laxity, and surgical technique. This retrospective study analyzed 121 knees in 101 patients. Patient-reported outcome measures (PROMs) were collected preoperatively and one year postoperatively, and were analyzed according to the surgical technique (opening or closing wedge), postoperative mechanical axis deviation (deviations above and below 10% from the target), and achievement of medial joint opening (∆JLCA > 1°). Radiological parameters, including JLCA, mechanical axis deviation, and the difference in JLCA between preoperative standing and supine radiographs (JLCAPD), an indicator of medial soft-tissue laxity, were measured. Cut-off points for parameters related to achieving medial joint opening were calculated from receiver operating characteristic (ROC) curves.Aims
Methods
The aims of this study were to assess the clinical outcomes especially range of motion of the knee after total knee arthroplasty with sigma RP-F versus LCS RP. 110 knees underwent total knee arthroplasty with LCS, and 59 knees with PFC sigma RP-F. We performed a prospective clinical trial. At the time of the one-year follow-up, we compared the clinical outcomes of two groups. In LCS group, LCS AP glide type group was excluded. Range of motion, the knee score, functional score and HSS score etc. were assessed. 91 knees were available. The mean active non-weight-bearing range of motion at one year was 124 (95% confidence interval) in the fifty-six knees that underwent a LCS and 127 (95% confidence interval) in the thirty-six knees that underwent a PFC sigma RP-F (p=0.55). There were no significant differences in the knee score (the mean 94.12 in LCS, 93.54 in RP-F, p=050), functional score(the mean 62.58 in LCS, 65.14 in RP-F, p=0.91) and HSS score (the mean 87.73 in LCS, 87.85 in RP-F, p=0.50). Although PFC sigma RP-F has the design that is advantageous in knee flexion, we found no significant differences between the groups with regard to range of motion or clinical outcomes.
