In developmental dysplasia of the hip (DDH), the Graf classification on ultrasound is based on which measurements?

• A Acetabular index and center-edge angle
• B Alpha angle and beta angle ✓
• C Shenton's line and Perkins' line
• D Neck-shaft angle and anteversion angle

Explanation

The Graf classification uses the alpha angle (osseous roof of acetabulum, normal ≥60°) and beta angle (cartilaginous roof, normal <55°) on a standard coronal ultrasound view. Graf types I to IV describe progressively severe dysplasia and dislocation. The acetabular index and center-edge angle are radiographic measures used after ossification.

Reference: Tachdjian's Pediatric Orthopaedics, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.