Mylène Jansen

92 Chapter 5 Table 1 : Baseline characteristics of both groups KJD (n=16) HTO (n=35) P- value Mean follow-up (years) 5.1 (0.7) 5.0 (0.6) n.s. Age (years) 50.5 (4.8) 49.6 (6.9) n.s. Female sex, n (%) 3 (19) 15 (43) n.s. BMI (kg/m 2 ) 27.1 (3.2) 27.2 (3.4) n.s. Right leg, n (%) 10 (63) 18 (51) n.s. Kellgren-Lawrence grade, n (%) - Grade 0 - Grade 1 - Grade 2 - Grade 3 - Grade 4 0 (0) 4 (25) 3 (19) 8 (50) 1 (6) 1 (3) 5 (14) 10 (29) 16 (46) 3 (9) n.s. Tibiofemoral axis (degrees) 6.1 (2.1) 6.2 (2.4) n.s. Previous surgery yes, n (%) - ACL reconstruction - Fixation OD lesion - Knee arthroscopy - Lateral release + tibial tuberosity transposition - Open medial meniscectomy 2 (13) 0 (0) 11 (69) 0 (0) 0 (0) 2 (6) 1 (3) 26 (74) 1 (3) 2 (6) Mean and standard deviation or n (%) are given. ACL: anterior cruciate ligament; BMI: body mass index; HTO: high tibial osteotomy; KJD: knee joint distraction; n.s.: not significant; OD: osteochondritis dissecans. Sport-related outcomes Out of 51 respondents, 44 patients had participated in 1 or more sports at some time point preoperatively (Table 2). In the KJD group, 11 out of 14 patients (79%) returned to 1 or more sports, compared to 24 out of 30 patients (80%) in the HTO group (Figure 3; n.s.). For the KJD and HTO group, the number of patients that returned to sport within 4 months was 18% and 33% respectively (n.s.), and within 6 months 73% and 75% respectively (n.s.). No significant differences were found between both groups for sports frequency (times and hours per week) at any of the reported time points (Table 3). A shift from participation in high- and intermediate-impact sports to participation in intermediate- and low-impact sports was reported in both groups (Table 3; Supplementary Table S2).