Table 2 Characteristics of the patients

Age-Y(Mean ± SD)

10–40 (20.9 ± 7.08)

10–47 (19.65 ± 8.51)

0.367

≤ 18

112(65.5%)

100(58.5%)

0.187

>18

59(34.5%)

71(41.5%)

Gender

Female

126(73.7%)

121(70.8%)

0.546

Male

45(26.3%)

50(29.2%)

Bilateral instability

No

132 (77.2%)

171 (100%)

Yes

39 (22.8%)

0 (0%)

Trochlear Dysplasia (Dejour)

None

116(67.8%)

142(83%)

A

35(20.5%)

29(17%)

B-D

20(11.7%)

0(0%)

Skeletal immaturity

No

65(38%)

58(33.9%)

0.43

Yes

106(62%)

113(66.1%)

Patellar height(ISI)

≤ 1.2

82(48%)

138(80.7%)

<0.001

> 1.2

89(52%)

33(19.3%)

TT-TG/PL

<0.5

19(11.1%)

167(97.7%)

<0.001

≥ 0.5

152(88.9%)

4(2.3%)

Contralateral instability

39(22.8%)

0(0%)

LTI

20.62 ± 4.42

24.73 ± 4.16

<0.001

Patellar tilt (°)

≤ 20

10(5.2%)

115(67.3%)

<0.001

> 20

161(94.2%)

56(32.7%)

TT-TG(mm)

< 16

44(25.7%)

119(69.6%)

<0.001

≥ 16

127(74.3%)

52(30.4%)