Question

An 11-year-old boy presented with a painless limp. X-ray was done and the image was obtained. What is the most likely diagnosis?

• A. Perthes disease
• B. Developmental dysplasia of the hip
• C. TB hip
• D. Slipped capital femoral epiphysis

Hint:

Child with painless limp and femoral head changes = think of Perthes disease.

Answer 1

The Correct Option is A

Concept: Perthes disease is avascular necrosis of the femoral head in children. It commonly presents with painless limp and hip or knee pain.

Step 1: Identify the age and symptom.
A child with painless limp strongly suggests a pediatric hip disorder.

Step 2: Recall Perthes disease.
Perthes disease involves: \[ \text{Avascular necrosis of femoral head} \] It commonly occurs in boys and presents with limp.

Step 3: Compare with other options.
Slipped capital femoral epiphysis is more common in obese adolescents. Developmental dysplasia is usually detected earlier. TB hip usually has pain and systemic features. Therefore, the correct answer is Perthes disease.