A 10 years old male with pain in left hip & limping on examination restricted abduction & internal rotation, probable diagnosis is -: (A) Septic arthritis of hip, (B) Tuberculous arthritis of hip, (C) Congenital dislocation of hip, (D) Perthes disease
Answer is D. 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.