Table 5.
Suggested mean and upper limit of the reference interval values for the alpha angle in the current literature, from studies of asymptomatic individuals, with a lateral (or equivalent) radiological projection
| Author | Imaging modality | No. of individuals (hips) | Alpha angle (°) | |||
|---|---|---|---|---|---|---|
| Mean | SD | Range | Upper limit 95% reference interval | |||
| a Suggested by authors | ||||||
| Notzli et al. (2002) | MRI | 35 (35) | 42 | 2 | 33–48 | 50 a |
| Beaule et al. (2005) | CT | 12 (20) | 44 | 5 | 36–50 | 53 |
| Clohisy et al. (2007) | Frog-lateral radiograph | 24 (24) | 44 | 12 | 30–92 | 67 |
| Clohisy et al. (2007) | Cross-table lateral radiograph (neutral rotation) | 24 (24) | 47 | 15 | 31–76 | 77 |
| Present study | Cross-table lateral radiograph (15° internal rotation) | 83 (166) | 47 | 8 | 30–70 | 62 |