Table 1 Descriptive Characteristics of the Population before Surgery

Sex

  male

30 (28)

  female

78 (72)

Age at surgery, y

  Mean ± SD

19.2 ± 6.1

  Minimum; Maximum

13; 40

Body mass index, kg/m²

  Mean ± SD

21.7 ± 3.4

  Minimum; Maximum

16.6; 37.6

Side

  Right

52 (48)

  Left

56 (52)

Patellar height(CDI)

  Mean ± SD

1.2 ± 0.22

  Minimum; Maximum

0.5; 1.6

Class of patellar height

   < 1.3

36 (33)

   ≥ 1.3

72 (67)

Trochlear dysplasia

  Type A

26 (24)

  Type B

18 (17)

  Type C

38 (35)

  Type D

26 (24)

TT-TG distance, mm

  Mean ± SD

22 ± 3.0

  Minimum; Maximum

17; 30

Class of TT-TG distance, mm

   < 20

30 (28)

   ≥ 20

78 (72)

Postoperative Kujala score

  Mean ± SD

90.5 ± 15.5

  Minimum; Maximum

24; 100

Postoperative Tegner score

  Mean ± SD

5.3 ± 1.3

  Minimum; Maximum

2; 8

Postoperative IKDC score

  Mean ± SD

72.7 ± 12.1

  Minimum; Maximum

26; 86

Follow-up, m

  Mean ± SD

61.3 ± 15.4

  Minimum; Maximum

36; 92

Status at the follow-up

  Success

102 (94)

  Failure

6 (6)