Mylène Jansen

94 Chapter 5 Table 3 : Sports frequency, participation, and level of impact for both groups Presymp 1 year preop 1 year postop Final follow-up KJD (n=14) HTO (n=30) KJD (n=14) HTO (n=30) KJD (n=14) HTO (n=30) KJD (n=14) HTO (n=30) Sports frequency, times/wk* No participation – – 2 (14) 4 (13) 5 (36) 9 (30) 4 (29) 8 (27) ≤1 1 (7) 4 (13) 1 (7) 9 (30) 2 (14) 11 (37) 3 (22) 11 (37) 2 1 (7) 6 (20) 6 (43) 8 (27) 5 (36) 4 (13) 3 (22) 7 (23) 3 5 (36) 8 (27) 4 (29) 6 (20) 2 (14) 2 (7) 2 (14) 2 (7) ≥4 7 (50) 12 (40) 1 (7) 3 (10) – 4 (13) 2 (14) 2 (7) Sports participation, hrs/wk* No participation – – 2 (14) 4 (13) 5 (36) 9 (30) 4 (29) 8 (27) 0 – 2 3 (22) 3 (10) 5 (36) 11 (37) 4 (29) 9 (30) 4 (29) 11 (37) 3 – 4 2 (14) 6 (20) 4 (29) 4 (13) 3 (21) 8 (27) 2 (14) 7 (23) 5 – 6 2 (14) 10 (33) 2 (14) 11 (37) 2 (14) 4 (13) 3 (21) 2 (7) >6 7 (50) 11 (37) 1 (7) – – – 1 (7) 2 (7) Level of impact Low 38 (37) 67 (34) 23 (58) 41 (47) 21 (66) 42 (55) 25 (66) 43 (61) Intermediate 28 (28) 81 (41) 11 (27) 33 (38) 9 (28) 31 (41) 12 (32) 23 (32) High 35 (35) 49 (25) 6 (15) 13 (15) 2 (6) 3 (4) 1 (3) 5 (7) Total sports 101 (–) 197 (–) 40 (–) 87 (–) 32 (–) 76 (–) 38 (–) 71 (–) N (%) is given. *Due to rounding sum score can be >100%. hrs: hours; HTO: high tibial osteotomy; KJD: knee joint distraction; postop: postoperative; preop: preoperative; presymp: presymptomatic; wk: week Compared to the patient’s best sports ability in their lifetime, all KJD patients (100%) reported worse or much worse sports ability at final follow-up, compared to worse or much worse in 25 HTO patients (83%), unchanged in 1 HTO patient (3%) and improved or much improved in 4 HTO patients (13%) (n.s.). In the KJD group, the median Tegner score decreased from 5.0 (IQR 4.0–5.0) presymptomatically to 3.5 (3.0–4.0) 1 year postoperatively ( p= 0.02). In the HTO group, the median Tegner score decreased from 5.0 (IQR 4.0–7.0) presymptomatically to 3.0 (2.0–4.0) 1 year postoperatively ( p< 0.001). The median ΔTegner score was -1.0 (IQR -2.0 to 0) in the KJD group, compared to -1.0 (-3.0 to 0) in the HTO group (n.s.). The mean Lysholm score at follow-up was 67 (SD 10) in the KJD group compared to 65 (23) in the HTO group (n.s.). Work-related outcomes In the KJD group, 16 patients (100%) were working before the onset of restricting knee symptoms, and 3 months preoperatively 15 patients (94%) were still working. In the HTO group, 32 out of 35 patients (91%) were working before the onset of knee symptoms, and 3 months preoperatively 29 patients (83%) were still working. Postoperatively, 15 out of 16 KJD patients (94%) returned to work, compared to 31 out of 32 HTO patients (97%; n.s.). The RTW rate within 2 months was 27% in the KJD group and 45% in the HTO group (n.s.). The RTW rate within 4 months was 53% in the KJD group and 72% in the HTO