<unk>  affects approximately 1–10 per 100,000 children. The incidence varies by geographic location, season of the year, and ethnicity. In eastern Japan, the incidence is 0.2 per 100,000 and in the northeastern U.S. it is about 10 per 100,000. Africans and Polynesians have higher rates of<unk> .<unk> s are most common in adolescents 11–15 years of age, and affects boys more frequently than girls (male 2:1 female). It is strongly linked to obesity, and weight loss may decrease the risk. Other risk factors include: family history, endocrine disorders, radiation / chemotherapy, and mild trauma. The left hip is more often affected than the right. Over half of cases may have involvement on both sides (bilateral).
Slipped capital femoral epiphysis
Attenuated patella alta
Osteitis pubis
Retrocalcaneal bursitis
Luxating patella
Radial dysplasia
Multiple epiphyseal dysplasia
Calcaneal fracture