Graphical illustration summary of the technique: (a) K-wire insertion; (b) replacement of the K-wire by a pin; (c) adding one more proximal pin; (d) insertion of proximal pins; (e) performing percutaneous osteotomy; (f) bone shifting following osteotomy rule 2; (g) varisation, making the proximal pins parallel to the distal ones; (h) connecting the pins to the external fixator.