Correction of the first metatarsal angle and stabilisation of the osteotomy. a. Schematic diagram showing the correction of the first intermetatarsal angle. The open-wedge osteotomy is additionally stabilized by cortical bone (arrow, see also Figure 2b). b. Stabilisation of the osteotomy with a partially threaded cancellous bone screw. The entrance hole was countersunk. Wedge-shaped autologous bone obtained from the medial eminence of the metatarsal head was inserted medially.