Table 1 Preoperative demographic data and radiologic evaluation

Preoperative demographic data

 Age at surgery^a, years

18.3 ± 4.8 (11.0–31.0)

 Male sex, n (%)

12 (48.0)

 Injury side, right, n (%)

6 (24.0)

 Body mass index^a, kg/m²

22.4 ± 3.8 (17.5–31.6)

Number of dislocations, n

 2–4

22

 ≥5

3

 Interval between the onset of primary dislocation and surgery†, months

12.3 ± 25.7 (1.0–92.0)

 Radiological follow-up period^a, years

3.6 ± 2.1 (1.0–8.3)

 Clinical follow-up period^a, years

7.0 ± 2.5 (3.8–12.2)

Preoperative radiologic evaluation

 Hip-knee-ankle angle^a, °

-1.9 ± 6.3 (-18.0–7.0)

 Preoperative C-D index^a

-0.9 ± 0.1 (0.7–1.1)

 TT-TG distance^a, mm

13.1 ± 2.3 (9.0–18.0)

 Trochlea dysplasia, Dejour type A-B-C-D

8-5-11-1

 Osteochondral fragment, n (%)

11 (44.0)