This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
Perthe's disease is treated by - 
Select and explain. 
A. High dose of calcium with steroids, B. Total hip replacement, C. Supervised containment of femoral head in acetabulum, D. Relieving weight bearing
C: Supervised containment of femoral head in acetabulum
Answer: C: Supervised containment of femoral head in acetabulum 
Explanation: The head is required to be kept inside the acetabulum while the revascularisation takes place (head containment).
This may be achieved by conservative methods (plaster, splint etc) or by operation (containment osteotomy).