Malunion causes not only cosmetic problems, but also degenerative osteoarthritis due to changes in the anatomical and mechanical axes. Corrective osteotomy may be required in some cases to prevent these complications. The corrective osteotomy is divided into two types: Straight and dome. The straight type is divided into open and closed wedge, in accordance with the correction method. Surgeons should understand the indication, surgical procedure, as well as the advantages and disadvantages of each osteotomy method. Deciding on the method of corrective osteotomy depends on the degree of angulation, soft tissue condition, approximate with joint, implant type, and the experience of the surgeon.