Introduction of the Ilizarov external fixator has bought about a treatment revolution to resolve such orthopaedic problems as fracture fixation, limb lengthening, deformity correction, joint mobilization, and reconstruction of bone and soft tissue defects. One of the advantages of the Ilizarov method is its versatility, that is, different orthopaedic problems can be simultaneously treated with the Ilizarov method. In this study, we introduce a method of deformity correction of the lower extremities and reconstruction of skeletal defects using the Ilizarov external fixator. Deformity correction with the Ilizarov hinge system is very useful to realign the mechanical axis of the lower extremities. We also introduce a new concept of high tibial osteotomy called“mechanical axis lateralization”for genu varum resulting from unicompartmental medial osteoarthrosis, Blount's disease and so on. In addition, the Ilizarov method made it possible to successfully reconstruct extensive bone defects combined with or without intramedullary nailing. The Ilizarov method will become more widely used and advantageous if the treatment period is shortened.
