1 in 10000, 4-8 years of age, males affected more Insidious onset, may cause painless limp, intermittent hip, knee, groin or thigh pain Loss of internal rotation and abduction is classical Pathophysiology : Osteonecrosis occurs secondary to disruption of blood supply to femoral head; Revascularization with subsequent resorption and later collapse X Ray- AP of pelvis and frog leg lateral Bone scan and…
