May Be Caused by

 Common

Hypothyroidism

Infantile hypothyroidism

Legg-Calvé-Perthes disease

Meyer dysplasia of the femoral head

Multiple epiphyseal dysplasia Fairbank type

Multiple epiphyseal dysplasia Ribbing type

Osteochondritis dissecans

Subchondral dysplasia

 Uncommon

Bardet-Biedl syndrome

Elsbach dysplasia

Geleophysic dysplasia

Kniest dysplasia

Pseudoachondroplasia

Rubinstein-Taybi syndrome

Silver-Russell syndrome

Spondyloepiphyseal dysplasia

Trichorhinophalangeal dysplasia type 1

Trichorhinophalangeal dysplasia type 2