Table 1.
Demographic Data and Trochlear Measurements of the PI and Control Groupsa
| Group, Mean ± SD or No. | |||
|---|---|---|---|
| Control (n = 100) | PI (n = 97) | P Value | |
| Age, y | 14.5 ± 1.9 | 14.5 ± 1.8 | .88 |
| Body mass index | 23.7 ± 5.7 | 25.5 ± 6.4 | .04 |
| Sex | |||
| Male | 55 | 53 | .96 |
| Female | 45 | 44 | .96 |
| Trochlear measurements | |||
| LTI, deg | 18.9 ± 5.8 | 5.8 ± 10.4 | <.001 |
| LPI, deg | 8.7 ± 6.3 | 20.9 ± 9.1 | <.001 |
| Sulcus angle, deg | 140.5 ± 6.4 | 158.4 ± 9.3 | <.001 |
| pTT-TG, mm | 9.2 ± 4.2 | 14.9 ± 4.3 | <.001 |
| dTT-TG, mm | 9.0 ± 3.7 | 15.4 ± 4.3 | <.001 |
aBold P values indicate statistically significant difference between groups (P < .05). dTT-TG, distal tibial tubercle–trochlear groove; LPI, lateral patellar inclination; LTI, lateral trochlear inclination; PI, patellar instability; pTT-TG, proximal tibial tubercle–trochlear groove.