Sagittal translation in opening wedge osteotomy for the correction of thoracolumbar kyphotic deformity in ankylosing spondylitis.

Study Design: Retrospective.

Objectives: To document sagittal translation (ST) of the vertebral column in opening wedge osteotomy (OWO) for ankylosing spondylitis (AS) kyphosis.

Summary Of Background Data: Surgeons recognize displacement at the hinge of correction in OWO as an accidental event between the vertebrae on the side of OWO rather than ST of the cranial or caudal vertebral column.