What is "Head at risk" sign is seen in ? and explain in detail?
Ans. is'a'i.e., Pehes disease (Ref: Pediatric Ohopedic Deformities p.326) "Head at risk sign is a radiological prognostic sign for Pehes disease (also k/a Legg-Calves- Pehes disease or Coxa Planaor Idiopathic avascular necrosis of femoral head).