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| YIN Fei,ZHANG Shaodong,WU Xiaotao.Imaging study of short-segment pedicle screw instrumentation and transpedicular interbody bone graft for Denis type B thoracolumbar fractures[J].Chinese Journal of Spine and Spinal Cord,2013,(4):341-346. |
| Imaging study of short-segment pedicle screw instrumentation and transpedicular interbody bone graft for Denis type B thoracolumbar fractures |
| Received:December 10, 2012 Revised:March 12, 2013 |
| English Keywords:Thoracic vertebrae Lumbar vertebrae Spinal fractures Bone grafting Imaging analysis |
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| English Abstract: |
| 【Abstract】 Objectives: To investigate the loss of correction and defects repairment in Denis type B thoracolumbar fractures treated by short-segment pedicle screw instrumentation and transpedicular interbody bone graft. Methods: X-ray and CT images of forty patients suffering from Denis type B thoracolumbar fractures from May 2005 to December 2011 were collected. The assessments included sagital Cobb angle, compression rate of anterior vertebral body height, and the height of disk space of preoperation and postoperation, the vertebra defect degrees and sites in sagittal view and cross-section view of latest CT imaging. Results: 20 cases underwent short-segment pedicle screw instrumentation with transpedicular interbody bone graft. The time of follow-up was 15－30 months with an average of 22.3 months. 20 cases underwent only short-segment pedicle screw instrumentation. The time of follow-up was 12－30 months with an average of 19.6 months. Two groups showed good recovery of Cobb angle and anterior vertebral body height, with no significant differences(P>0.05). In bone graft group, the loss of correction was 4.1°±4.0°, the loss of anterior vertebral body height was (5.0±3.7)%, the loss of height at cranial adjacent disc was (1.29±1.9)mm. In none-bone graft group, the loss of correction was 5.6°±3.2°, the loss ofanterior vertebral body height was (5.7±4.5)%, the loss of height at cranial adjacent disc was (1.87±1.1)mm. There was no significant difference in the degree of loss of correction(P>0.05). The defects in sagittal and cross section CT scan in bone graft group mainly existed in one-third of the vertebral superior border. Compared with none-bone graft group, bone graft group had less degree of bone defects(P<0.05). Conclusions: Short-segment pedicle screw instrumentation with allograft graft is effective for Denis type B thoracolumbar fractures, which can effectively correct kyphosis, recover anterior vertebral body height and decrease the degree of bone defect. |
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