Who typically gets perthes disease?

Perthes Femoral head: Perthes disease is a condition that often presents in children under the age of ten years old. IT is a condition of loss of blood supply to the femoral head that can cause growth and femoral shape abnormalities over time. A painful hip or knee is often the first sign accompanied with the inability to walk because of the pain

Leg Calve Perthes: Disease can be isolated or familial. Avascular necrosis of the femoral head occurs in growing children. The familial type, caused by heterozygous mutation in the COL2A1 gene on chromosome 12q13, is thought to be multi-factorial, with a recurrence rate of ~3%. It's commonly seen in kids aged 4-10 years, some say 2-12, & is more common in boys than girls.