Table 2.

Modified Severin classification

Excellent
IA	CE angle >19°, age 6 to 13 years; CE angle >25°, age >14 years
Good
IB	CE angle 15° to 19°, age 6 to 13 years; CE angle 20° to 25°, age >14 years
II	Moderate deformity of the femoral head, femoral neck or acetabulum, but otherwise the same as grade I
Fair
III	Dysplastic hip, no subluxation; CE angle <20°, age >14 years
Poor
IV	Subluxation
V	Femoral head in false acetabulum
VI	Redislocation

CE: center-edge