What non-invasive imaging technique is often used for evaluating hip dysplasia?

• A. X-ray
• B. MRI
• C. Ultrasound
• D. CT scan

Answer: (C)

Ultrasound is commonly used for evaluating hip dysplasia, particularly in infants and young children. This technique is advantageous because it does not involve radiation, making it safe for pediatric patients. An ultrasound can provide real-time images of the hip joint and surrounding structures, allowing for the assessment of accommodation of the femoral head within the acetabulum and the presence of any developmental abnormalities.

The use of ultrasound is particularly relevant in this context since it is effective during early development when the structures of the hip are cartilaginous and not well visualized on X-rays. It allows for dynamic examination of the hip's range of motion and can detect potential dislocation or subluxation that may not be discernible through other imaging modalities.

While both X-rays and CT scans are useful in evaluating skeletal structures and diagnosing hip problems in older children and adults, they are not suitable for the early assessment of developmental dysplasia in the same way that ultrasound is. MRI, although valuable for soft tissue evaluation and certain cases of hip pathology, is also less commonly used specifically for the initial screening of hip dysplasia.