Final answer:
Legg-Calve-Perthes disease is a condition that affects the hip joint in children, causing bone deformity and limited range of motion. Boys are more commonly affected than girls, and the exact cause is unknown.
Step-by-step explanation:
Legg-Calve-Perthes disease, also known as Perthes disease or avascular necrosis of the femoral head, is a condition that affects the hip joint in children. It occurs when there is interrupted blood supply to the femoral head (the rounded top of the thighbone), leading to the death of bone cells and subsequent bone deformity. This can cause pain, limping, and limited range of motion in the affected hip.
This disease primarily affects children between the ages of 4 and 8, with boys being more commonly affected than girls. The exact cause of Legg-Calve-Perthes disease is unknown, but it is believed to involve a combination of genetic and environmental factors. Risk factors for the condition include a family history of the disease, certain growth factors, and certain physical activities that put stress on the hip joint.