Table 1.

Calculation of the radiological score

(a) Appearance of lower femoral growth cartilage	Normal	0
	Epiphysiolysis <50% of surface area	1
	Epiphysiolysis >50% of surface area	2
(b) Appearance of articular space	Normal	0
	Enlarged	1
	Narrowed	2
(c) Condensation of subchondral bone	Absence of condensation	0
	Condensation <50% of surface area	1
	Condensation >50% of surface area	2
(d) Osteolysis	Absence of osteolysis	0
	1 or 2 punched-out lesions	1
	More than 2 punched-out lesions	2
	Major osteolysis	3
Radiological score (a + b + c + d)		0–9