Opening wedge osteotomy hemicallotasis with Orthofix (Verona, Italy) dynamic external fixator. A, Positioning of fixator. B, Fixator provisionally secured with Kirschner wires. C, Proximal fixator pin inserted. D, Medial and lateral proximal fixator pins. E, Distal fixator pins placed. F, Osteotomy guide attached. G, Series of holes drilled at osteotomy site. H, Holes connected with osteotome or saw. I, Distraction of osteotomy. SEE TECHNIQUE 9.10.