Mylène Jansen

Return to sport and work after KJD and HTO 95 5 group (n.s.), and the RTW rate within 6 months was 91% in the KJD group and 87% in the HTO group (Figure 4; n.s.). Figure 4 : Time to return to work (RTW) for the 2 groups. HTO: high tibial osteotomy; KJD: knee joint distraction. None of the KJD patients and 1 HTO patient-reported knee complaints as the reason for no RTW. The presymptomatic workload, preoperative workload and changes in postoperative workload did not significantly differ between both groups (Table 4). The number of working hours also did not significantly differ between both groups 3 months preoperatively, 1 year postoperatively and at final follow-up (Supplementary Table S3). Table 4 : Presymptomatic and preoperative workload, and postoperative change in workload, for both groups Workload Presymp HTO Presymp KJD Preop HTO Preop KJD Postop change in workload HTO KJD Light 62 44 66 47 Lighter – 7 Intermediate 19 19 17 13 Equal 91 93 High 19 37 17 40 Higher 9 – P- value 0.36 0.25 0.19 % Of patients is given. HTO: high tibial osteotomy, KJD: knee joint distraction; postop: postoperative; preop: preoperative; presymp: presymptomatic. P -values were calculated with Fisher's exact test. The improvement (Δ) in mean WORQ scores from preoperatively to postoperatively was higher in the HTO group (16 (SD 16)) than in the KJD group (6 (13); p= 0.04). For the KJD group, most patients experienced severe difficulty with kneeling (44%), clambering (38%) and walking on rough terrain preoperatively (38%; Figure 5a). The largest postoperative improvements were reported for walking on rough terrain (-25% reporting extreme difficulty), clambering (-19%) and kneeling (-19%; Figure 5a). For the HTO group, ≥50% of patients experienced severe difficulty with kneeling, crouching, clambering and taking the stairs 3