Review Article
The Epidemiology and Demographics of Hip Dysplasia
Table 1
Graf’s classification of hip dysplasia using ultrasound.
| Graf’s hip type | Description | α angle (°) | β angle (°) | Age |
| I | Normal | >60 | <55 | Any | IIa | Physiologically immature | 50–60 | 55–77 | 0–12 wks | IIb | Immature | 50–59 | 55–77 | >12 wks | IIc | Acetabular deficiency | 43–49 | >77 | Any | IId | Everted labrum with subluxation | 43–49 | >77 | Any | III | Everted labrum with dislocation | <43 | >77 | Any | IV | Dislocation | <43 | >77 | Any |
|
|
As described by Graf [23], Roposch et al. [24], and Herring [25].
|