طفل عمره ٦ سنوات عنده عرج بدون ألم شديد منذ شهر، وحركة الورك الأيمن محدودة قليلاً. الحرارة طبيعية، والتحاليل طبيعية. الأشعة تظهر تغيراً في رأس عظم الفخذ. ما الأرجح؟

A 6-year-old has had a limp without severe pain for a month with slightly limited right hip movement. He is afebrile and bloods are normal; X-ray shows changes in the femoral head. What is most likely?

1. Septic arthritis
2. Slipped capital femoral epiphysis
3. Osteosarcoma
4. Perthes disease

Answer: D) Perthes disease. Perthes disease is avascular necrosis of the femoral head in children aged 4–8, presenting with a limp and mild pain; management ranges from observation and physiotherapy to surgery.