Mechanical mechanism and relative problems of lumbar traction / 中国矫形外科杂志

[Objective] To discuss the mechanism and relative problems of lumbar traction. [Method] Relevant articles and retrospect clinical data in the author's hospital were reviewed. Review relevant articles and retrospect clinical data of our hospital. [ Result ] Traction force : 40 kg + 15% ～ 20% of body weight, fineness rate reached 83.5% in 1606 patients being treated. According to course of disease, fineness rate was 90. 1% in the group of less than 3 years, 68.2% in the group of more than 3 years. [ Conclusion] Lumbosacral nerve root leave the peak of the protruding nucleus and establish a new harmonious "root-disc" relationship after traction. The pressure and tension to the nerve root reduces or disappears, meanwhile, the pain of low back and leg is alleviated or eradicated. Appropriate traction weight and correct traction body posture are key factors of good therapeutic effect.

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

[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?.