Coronal plane deformity around the knee in the skeletally immature population: A review of principles of evaluation and treatment

Table 2 Main differences between infantile and adolescent forms of Blount disease

		Infantile form	Adolescent form
Age (yr)	< 5		> 10
Clinical features	50% bilateral, overweight, lateral thrust during gait, possible internal rotation of the tibia		Usually unilateral, overweight/obese, male predominance
X-RAY appearance	Varus angulation at the epiphyseal-metaphyseal junction, metaphyseal beaking with apparent fragmentation, medial physeal line widening and irregularity; lateral tibial subluxation; possible compensatory distal femur valgus		Widening of the proximal medial physeal line, normal shape of the proximal tibial metaphysis; possible presence of distal femur varus and compensatory distal tibial valgus
Natural history	Depending on the stage (spontaneous resolution is possible)		Usually progressive without spontaneous resolution
Treatment options	Depending on the stage		Surgery only