Lumbar spinal pedicle subtraction osteotomy on single segment for correction of kyphosis in ankylosing spondylitis / 中国矫形外科杂志

ABSTRACT

[Objective] To assess the outcomes of lumbar spinal pedicle subtraction osteotomy on single segment for correction of kyphosis in ankylosing spindylitis.[Methods]15 patients were treated with L2 or L3 pedicle subtraction osteotomy and internal fixation by pedicle screw system.All the patients underwent X-ray examinations in standing position before and after the operations.The angles in different part of the sagittal planes were measured and the preoperative and postoperative differences were compared.[Results]All the operations were well complete.The mean time of operations was 3h and the mean bleeding was 840 ml.The lumbar lordosis angle increase from(14.5?15.5)?to(48.4?11.9)?,the total spinal kyphosis angle and the thoracolumbar kyphosis angle improve from(36.1?14.7)?and(30.7?9.3)?to(0.2?14.2)?and(23.7?12.3)? respectively,the sacral slope increase from(12.0?12.7)?to(28.9?8.8)?,whereas thoracic kyphosis angle remained relative stable.[Conclusion]Lumbar spinal pedicle subtraction osteotomy on single segment is a satisfactory and reliable technique for correction of kyphosis in ankylosing spindylitis and the average correction of lumbar lordosis was 33.9?.