| Grade |
Rating |
Description |
| I |
Excellent |
Painless, stable hip; no limp; more than 15
degrees of internal rotation |
| II |
Good |
Painless, stable hip; slight limp or decreased
motion; negative Trendelenburg’s sign |
| III |
Fair |
Minimum pain; moderate stiffness; positive
Trendelenburg’s sign |
| IV |
Poor |
Significant pain |
| Severin classification |
| Class |
Description |
Center-edge angle (Degrees) |
| I |
Normal appearance |
≥15 (5-13 years)
≥20 (>14 years) |
| II |
Mild deformity of the femoral head and neck or the acetabulum |
≥15 (5-13 years)
≥20 (>14 years) |
| III |
Dysplasia or moderate deformity of the femoral head and neck or the acetabulum, or both |
<15 (5-13 years)
<20 (>14 years) |
| IV |
Subluxation of the femoral head |
- |
| V |
Articulation of the femoral head with a false acetabulum |
- |
| VI |
Redislocation |
- |