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Abstract
The spine in patients with a variety of spinal deformities. It is important to be able to recognize the type and underlying cause of the deformity so that the most appropriate osteotomy can be chosen.Sometimes they are needed for correction of severe rigid scheuermann{u2019}s kyphosis.The surgeon performing a spinal osteotomy should attempt to correct sagittal alignment to at least 25{u00B0} of lumbar lordosis. To achieve this level of lordosis in the lumber spine, any hooks used in the lumber spine should be put under compression, and distraction should be avoided. Furthermore the surgeon should attempt to correct plumb coronal alignment to <2.5 cm. In this way a predictable improvement in functional outcome can be expected with the amount of deformity correction achieved. An estimation of the degree of the correction obtained intraoperatively is difficult despite intraoperative portable radiographs, and as a result, there is tendency to overestimate the degree of correction, especially in the sagittal plane