Table 2.

Radiological and clinical outcomes according to the severin, ponseti and Mc Kay classifications (28–30).

Ponseti classification
I	Asymptomatic
II	Slight hip pain after long walks
III	Limp, free motion and no pain
IV	Limp and limitation of motion, no pain
V	Limp and pain
VI	Limp, limitation of motion and pain
McKay classification
Excellent	Stable painless hip, no limp, negative Trendelenburg sign, full range of movement
Good	Stable painless hip, slight limp, negative Trendelenburg sign, slight decrease in range of movement
Fair	Stable painless hip, limp, positive Trendelenburg sign, and limited range of movement, or a combination of these
Poor	Unstable or painful hip or both, positive Trendelenburg sign
Severin classification
I	Normal
II	Moderate deformity of femoral head or neck or acetabulum
III	Dysplastic
IV	Subluxed
V	Articulating with secondary acetabulum
VI	Dislocated
VII	Arthritic