Idiopathic avascular necrosis of capital femoral epiphysis in 4–8‑year‑olds (boys > girls). Radiographic **Waldenström stages**: Initial, Fragmentation, Re‑ossification, Healed. **Prognosis/Severity**: **Catterall** (I–IV) and **Herring (lateral pillar)** (A–C); age >6 yrs and Herring C predict poorer outcomes. Goal: **containment** of the femoral head within acetabulum to maintain sphericity (abduction bracing or osteotomy). MRI detects early marrow changes; lateral extrusion (loss of containment) indicates need for intervention.
What is the main goal of treatment in Legg-Calvé-Perthes disease?
In which stage of Waldenström's classification is the femoral head observed to have an increased radiodensity?
Which classification system is based on the extent of epiphyseal involvement in Legg-Calvé-Perthes disease?
Which of the following factors is associated with poorer outcomes in Legg-Calvé-Perthes disease?
What is the typical age range for children affected by Legg-Calvé-Perthes disease?
What imaging modality is particularly useful for detecting early marrow changes in Legg-Calvé-Perthes disease?
Which of the following describes the final shape of the femoral head after healing in Legg-Calvé-Perthes disease?
What does a loss of containment indicated by lateral extrusion in Legg-Calvé-Perthes disease suggest?
In the Catterall classification, which group indicates total epiphyseal involvement?
Which age factor is significant for the prognosis of Legg-Calvé-Perthes disease?
