Risk factors of ankle osteoarthritis in the treatment of critical bone defects using ilizarov technique

Table 5 Incidence of PTOA according to the number of risk factors present

Risk factors(n)^a	Patients (n) per risk factor category	Incidence of ankle OA
0	0	0(0 %)
1	109	24(22 %)
2	44	21(47.7 %)
3	26	14(53.8 %)
4	9	6(66.7 %)
5	-	-

^aTo categorize patients whether at risk or not, the continuous risk factors were dichotomized: age > 45years vs. age < 45years, male vs. female, BMI > 25 vs. BMI < 25, double level vs. single level, diabetes vs. not diabetes, hypertension vs. not hypertension, osteoporosis vs. not osteoporosis, glucocorticoid intake vs. not glucocorticoid intake, duration of disease > 24 months vs. duration of disease < 24 months.