A 10 years old male with pain in left hip & limping on examination restricted abduction & internal rotation, probable diagnosis is -

Amongst the given options restriction of abduction and internal rotation is seen only in Perthes disease. About other options In TB hip :- i) Stage of synovitis :- Restriction of adduction, internal rotation & extension. ii) Stage of arthritis :- Restriction of abduction, external rotation & extension. Septic arthritis :- Restriction of adduction, internal rotation, extension in early stages. Congenital dislocation of hip :- Restriction of abduction, external rotation.