At what stage of Legg-Calve-Perthes disease does new bone replace necrotic bone?

Question

Quizplus · Accepted Answer

Stage III or the residual stage is usually 2 to 3 years after the onset of the disease. New bone places necrotic bone, and the femoral head is replaced or surrounded by new bone. Collapse and flattening of the femoral head cause the femoral neck to become short and wide, with subluxation, progressive deformity, and even possible fracture.

At What Stage of Legg-Calve-Perthes Disease Does New Bone Replace