"Head at risk" sign is seen in ?
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).
Pehes disease
Ewing's sarcoma
Osteomylitis
Paget's disease