Modified diaphyseal osteotomy with a proximal center of rotation for moderate to severe hallux valgus

This study shows a modification of the scarf osteotomy, using a rotational and translational movement with a proximal center of rotation to correct moderate to severe hallux valgus deformities. The mathematical model of the osteotomy and the preoperative planning is presented, using the estimated intermetatarsal angle correction needed. A long oblique diaphyseal osteotomy is performed, with a short distal dorsal arm oriented 90 degrees to the long diaphyseal osteotomy, and a short plantar proximal arm oriented 90 degrees to the long osteotomy line. The distal fragment is rotated around a center of rotation located 15 mm proximal to the metatarsal cuneiform joint and fixed with 3 screws. The short-term results and complications are presented.