Fig. (8) Percentage of the femoral head covered by acetabulum (PFHA): (A/B) ×100. Coverage < 75% is pathologic. (With kind permission from Springer Science + Business Media: Skeletal Radiology, “Radiographic measurements of dysplastic adult hips”, Vol. 26, 1997, p. 78, Delaunay S, Dussault RG, Kaplan PA, Alford BA, Fig. 7).