Fig. 4A–B.

The drawings show the SERI osteotomy technique. (A) In the dorsoplantar view, the inclination of the osteotomy in the mediolateral direction is perpendicular to the foot axis (the long axis of the second metatarsal bone) if the length of first metatarsal bone must be maintained. The osteotomy is inclined in a distal to proximal direction as much as 25° if shortening of the metatarsal bone or decompression of the metatarsophalangeal joint is necessary. If lengthening is necessary, the osteotomy is inclined 15° in a proximal to distal direction. (B) In the lateral view, the adjustment of the plantar or dorsal dislocation of the metatarsal head is possible fixing the osteotomy with the K wire in the upper, or more rarely in the lower, site with regard to the long axis of the metatarsal head.