Legg-Calvé-Perthes Disease progresses through several stages: 1. Initial Stage: Reduced blood supply leads to bone cell death. 2. Fragmentation Stage: The weakened bone starts to break apart. 3. Reossification Stage: New bone begins to form, and the femoral head starts to reshape. 4. Healing Stage: Bone remodeling continues until the femoral head is fully reformed, although it may not return to its original shape.