Complex of AF pedicle screw system and injectable calcium sulfate bone graft for thoracolumbar burst fracture

English Keywords:Thoracic  Lumbar vertebrae  Calcium sulfate  Bone transplantation  Spinal fractures  Internal fixa鄄tors.

English Abstract:

  【Abstract】 Objective：To investigate the clinical effects of complex of AF pedicle screw system and injectable calcium sulfate graft for thoracolumbar burst fracture.Method：72 patients with thoracolumbar burst fractures were treated between December 2007 and December 2010，of them，36 cases（group A） underwent the complex of AF pedicle screw system and injectable calcium sulfate bone graft，while 36 cases（group B） underwent AF alone，all cases were followed up for an average of 13 months，the fractured vertebral body height，Cobb′s angle and kyphosis between 2 groups were reviewed and compared.Result：The preoperative fractured vertebral height for group A and B was 46.7% and 48.4%，while those for postoperative was 5.7% and 5.9%，and for final follow-up was 9.4% and 19.6% respectively.The preoperative Cobb′s angle for group A and B was 20.7° and 20.6°，while those for postoperative was 2.8° and 3.1°，and for final follow-up was 6.4°and 12.7° respectively.The preoperative kyphosis for group A and B was 20.7° and 20.5°，while those for postoperative was 6.4° and 6.8°，and for final follow-up was 7.8° and 13.8°.The preoperative and postoperative index between 2 groups showed no significant difference（P＞0.05），while those index at final follow-up between 2 groups showed significant difference（P＜0.01）.At final follow-up，calcium sulfate in group A was noted to induce ossification，screw loosening was noted in 1 case of group A，but there were 6 cases suffered instrument failure in group B（5 cases of screw breaking and 1 case of screw loosening）.Conclusion：Complex of AF pedicle screw system and injectable calcium sulfate bone graft for thoracolumbar burst fracture is reliable and less complication such as kyphosis increasing.