A pre-surgical planning method for performing a spherical osteotomy for the surgical sectioning of a bone includes obtaining a CT scan of a bone. Subsequently manipulating the scan into a three-dimensional CAD format. Utilizing the scan to identify one or more centers of bone correction or 3D CORAs. A surface, configured in the shape of a portion of a sphere, e.g., a semisphere, is then superimposed on the computer representation of the bone. The center of the surface is positioned at a respective center of bone correction. The intersection of the surface and the bone defines a sectioning surface along which the bone is to be cut.

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Simulating a sectioning of the bone along the sectioning surface and the subsequent realignment of the bone in an optimal configuration using the computer is then performed. The computer simulation is then utilized as a guide for actually sectioning the bone. What is claimed is: 1. RELATED APPLICATIONS This application claims the benefit under 35 USC §119 (e) of U.S. Application 61/450,062 filed Mar. 7, 2011 for “METHOD OF PERFORMING A SPHERICAL OSTEOTOMY”, which is hereby incorporated in its entirety by reference.

TECHNICAL FIELD This invention relates generally to methods of performing an osteotomy, namely a surgical division or sectioning of a bone. More particularly, the invention is directed to methods for performing a spherical osteotomy, of the type known as a “true dome” osteotomy. BACKGROUND Osteotomy is defined as a procedure for surgical division or sectioning of a bone.

This procedure is typically utilized by orthopedic surgeons to correct for malalignment and malorientation, including uniapical and multiapical deformities of the bone, as well as the treatment for compartmental diseases. Bone deformities are the result of the continuous response and adaptation of the bone as a living tissue to several external and internal factors, such as physiological forces, alterations due to trauma, tumors, and other conditions. As a result, the shape of the bone can be severely deformed in three dimensions, comprising angulation in the frontal plane, angulation in the sagital plane, and rotation along the bone axis. Moreover, the deformity can be localized at a point, such as those deformities caused by a fracture or those deformities which spread along the bone as exemplified by those caused by a growth defect. Displacement osteotomy is the surgical division of a bone and shifting of the divided ends to change the alignment of the bone or to alter weight-bearing stresses. The goal of displacement osteotomies is to create congruent matching surfaces to align, stabilize, and maximize contact between the corresponding bone sections. Osteotomies may include a number of different types of bone sectioning procedures that result in two corresponding sections of the bone which are then reoriented until a desired alignment between the bone sections is achieved.

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