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Table 1 Demographic data

From: Preoperative flexion contracture is a predisposing factor for cartilage degeneration at the patellofemoral joint after open wedge high tibial osteotomy

  Progression of patellofemoral OA (group P: n = 31) No progression
(group N: n = 41)
P value
Age, years 63.9 ± 11.3 61.8 ± 11.1 0.49
Sex, male/female 12/ 19 17/ 24 0.81
BMI, kg/m2 25.4 ± 3.2 24.1 ± 2.5 0.11
K/L grade
 I 0 1  
 II 8 11  
 III 18 17  
 IV 5 12 0.38
Time from OWHTO to second-look arthroscopy (months) 19.6 ± 4.4 20.4 ± 6.3 0.58
  1. BMI body mass index, K/L Kellgren/Laurence, OA osteoarthritis, OWHTO open-wedge, high tibial osteotomy