What is the characteristic symptom of Legg-Calve-Perthes disease?

Legg-Calve-Perthes disease, also known as avascular necrosis of the femoral head in children, commonly presents with hip pain and limping. This condition occurs due to a temporary loss of blood supply to the femoral head, leading to bone death and subsequent regeneration that can cause pain and disruption in normal joint function.

The characteristic symptoms often include pain localized to the hip or groin area, which may radiate to the knee. This pain is typically worse with activity and is often accompanied by a noticeable limp as the child attempts to compensate for discomfort while walking.

In contrast, the other options do not reflect the typical presentation of this disease. Coxitis relates to inflammation of the hip joint, which may occur due to various conditions but is not specifically indicative of Legg-Calve-Perthes. Painful dysuria pertains to urinary tract issues and has no relevance to the hip joint or leg conditions. Irregular menstruation is related to reproductive health and does not connect with the symptoms of Legg-Calve-Perthes disease. Thus, the emphasis on hip pain and limping closely aligns with the core manifestations of this condition.