Figure 2.

Acetabular radiographic measurements and correction. Pre-operative (A) antero-posterior radiograph of a hip with classic dysplastic. Basic radiographic measurements of dysplasia (B) include the lateral center edge angle (dashed black line; measure of lateral acetabular coverage), Tönnis angle (solid black line; measure of sourcil angle); the solid white line is the inter-teardrop line, which is the reference for pelvic tilt in the coronal plane; an anterior center edge angle on a false profile view completes the basic radiographic work-up. The post-operative (C) antero-posterior radiographic view of the same hip demonstrating satisfactory acetabular reorientation to correct bony dysplasia.