A six year old boy is brought to the OPD with complaints of limping since 1 month. On examination there is limitation of internal rotation and abduction of the right leg. The patient complains of mild pain. The patient shows no signs of malnutrition or wasting. There is no associated fever.

Investigations reveal normal blood counts and ESR is 19mm/hr. An AP view of the right hip is shown. Identify the condition. Source: med-ed.virginia.edu 2013.