What is an indicator of Legg-Calve-Perthes disease?

Legg-Calve-Perthes disease is characterized by the interruption of blood supply to the femoral head, which can lead to avascular necrosis. One of the classic indicators of this condition is an intermittent painless limp. This limp may be noted during activity and tends to worsen with increased physical exertion. Children with this disease typically do not report significant pain, especially in the early stages, which can lead to a delayed diagnosis.

The absence of significant pain is a key factor in distinguishing this condition from other hip disorders where pain is more prominent. While a painful hip joint may occur as the disease progresses, particularly during the later stages, it is not the initial presenting symptom. Severe swelling of the leg is not typical for this condition, as swelling is usually not observed. Additionally, while some children with Legg-Calve-Perthes may experience difficulty bearing weight, the defining feature remains the intermittent painless limp, making it the most characteristic indicator of the disease.