Which of the following is a commonly described sign in Legg-Calve-Perthes disease?

• A. Long limb
• B. Short limb
• C. Normal limb length
• D. Painful knee

Answer: (B)

Legg-Calve-Perthes disease disrupts growth of the proximal femur after avascular necrosis of the femoral head. When one hip is affected, the growth disturbance can lead to a shorter femoral segment on that side, making the limb appear shorter. This leg-length discrepancy is a commonly described sign in affected children. While hip pain is typical and knee pain can be referred, the standout clinical feature related to the disease’s impact on growth is shortening of the affected limb. A long limb would be inconsistent with the usual growth disruption, and a normal limb length is less likely as disease progresses.