Deformity planning for frontal and sagittal plane corrective osteotomies

D Paley, J E Herzenberg, K Tetsworth, J McKie, A Bhave
Orthopedic Clinics of North America 1994, 25 (3): 425-65
The authors have developed a universal system of geometric deformity planning based on the mechanical or anatomic axes. The place where the axes intersect is the center of rotation angulation (CORA) of a deformity. Osteotomy level and type should be considered relative to the CORA to avoid creating secondary deformities. This type of planning is applicable to both frontal and sagittal plane deformities.

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