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

Table 1 Demographic data

	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

BMI body mass index, K/L Kellgren/Laurence, OA osteoarthritis, OWHTO open-wedge, high tibial osteotomy

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