Graf classification in pediatric hip ultrasound uses which two angles?

Graf classification in pediatric hip ultrasound uses which two angles?

• A. Gamma and delta angles
• B. Theta and phi angles
• C. Alpha and beta angles
• D. Beta and gamma angles

Answer: (C)

Graf classification relies on two angular measurements taken on a coronal hip ultrasound to evaluate how the acetabulum is forming and how stable the hip is. The first angle, called the alpha angle, measures the slope of the bony acetabular roof relative to a baseline. A larger alpha angle indicates a more mature, well-formed bony roof. The second angle, the beta angle, measures the slope of the cartilaginous portion of the acetabulum (the cartilage-covered roof) relative to the same baseline, reflecting the cartilaginous coverage of the femoral head. Together, these two angles describe both the osseous and cartilaginous components of the acetabulum, allowing classification of hip development and identification of dysplasia. Other angle names (like gamma, delta, theta, phi) aren’t part of Graf's system, which is why alpha and beta are the ones used.

Graf classification relies on two angular measurements taken on a coronal hip ultrasound to evaluate how the acetabulum is forming and how stable the hip is. The first angle, called the alpha angle, measures the slope of the bony acetabular roof relative to a baseline. A larger alpha angle indicates a more mature, well-formed bony roof. The second angle, the beta angle, measures the slope of the cartilaginous portion of the acetabulum (the cartilage-covered roof) relative to the same baseline, reflecting the cartilaginous coverage of the femoral head. Together, these two angles describe both the osseous and cartilaginous components of the acetabulum, allowing classification of hip development and identification of dysplasia. Other angle names (like gamma, delta, theta, phi) aren’t part of Graf's system, which is why alpha and beta are the ones used.