Table 1.
Alpha Angles, Cases vs. Controls
| Cases: Minimum Alpha Angle | Cases: Maximum Alpha Angle | FAI Controls | |
|---|---|---|---|
| Frog Leg Lateral Alpha Angle (deg) | 61.2±11.1 | 74.7±10.8* | 52.7±12.7 |
| AP Alpha Angle (deg) | 64.9±17.1 | 91.7±10.7* | 61.3±19.4 |
| Percentage with Mild Frog Cam Deformity (50-55 deg) | 27.6 | 6.9 | 48.3 |
| Percentage with Moderate Frog Cam Deformity (55-63 deg) | 41.4 | 3.4 | 17.2 |
| Percentage with Severe Frog Cam Deformity (63 deg) | 31 | 89.7 | 34.5 |
Comparisons of alpha angles between cases and controls were significantly different when osteophytes were included in the measurements, but not when excluded (p-value ≤ 0.05).