Fig. 2A–C.

A female patient was operated bilaterally (right hip at age 7 years and left at 8 years). Femoral shortening was performed bilaterally (2 cm at the right femur and 2.5 cm at the left). (A) At initial presentation both hips were Tönnis Grade 4. Preoperative acetabular index was 46° at the right site and 40° at the left. (B) An early followup radiograph is shown. She was followed for 17 years. (C) At the last followup, she was pain-free, had no limping, and was able to perform all daily activities with no limitation. Radiographically, the acetabular indices were 15° and 8°, the center-edge angles were 23° and 32°, the Reimers indices were 0.15 and 0.13, and the acetabular depth-to-width ratios were 46% at both the right and left hips. Both hips were Severin Class 2, excellent according to modified McKay’s criteria.