In which age group is Legg-Calve-Perthes disease most commonly diagnosed?

Legg-Calve-Perthes disease is most commonly diagnosed in young children, specifically in the age range of 4 to 8 years. This condition involves the avascular necrosis of the femoral head, leading to hip joint problems. The reason this age group is significant is due to the developmental stage of the children, their high levels of activity, and the increased stress placed on the hip joint, which may exacerbate underlying conditions that lead to Legg-Calve-Perthes disease.

Additionally, the incidence of this disease peaks around this age, as it often begins with subtle symptoms that may develop into more pronounced signs as children grow. The diagnosis is less common in other age groups, as infants would not have developed the hip joint enough for such conditions to typically manifest, and adolescents usually experience different hip-related issues that are unrelated to Legg-Calve-Perthes disease. Thus, the correct answer accurately reflects the demographic most affected by this condition, highlighting the need for awareness and early diagnosis in young children.