Shengnai Zheng,Qingqiang Yao,Li Cheng,Yan Xu,Peng Yuan,Dongsheng Zhang,Xiangwen Liao,Liming Wang.[J].南京医科大学学报,2010,(2):115~123 |
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The effects of a new shape-memory alloy interspinous process device on the distribution of intervertebral disc pressures in vitro |
投稿时间:2009-09-03 |
DOI:10.7655 |
中文关键词: |
英文关键词: Lumbar spine, disc pressure, interspinous process device, biomechanics |
基金项目: |
作者 | 单位 | Shengnai Zheng | Department of Orthopaedics, Nanjing First Hospital Affiliated to Nanjing Medical University,Nanjing 210029,Jiangsu Province, China | Qingqiang Yao | Department of Orthopaedics, Nanjing First Hospital Affiliated to Nanjing Medical University,Nanjing 210029,Jiangsu Province, China | Li Cheng | Department of Orthopaedics, Wuxi People's Hospital Affiliated to Nanjing Medical University,Wuxi 214023, Jiangsu Province, China | Yan Xu | Department of Orthopaedics, Nanjing First Hospital Affiliated to Nanjing Medical University,Nanjing 210029,Jiangsu Province, China | Peng Yuan | Department of Orthopaedics, Wuxi People's Hospital Affiliated to Nanjing Medical University,Wuxi 214023, Jiangsu Province, China | Dongsheng Zhang | Lab of Biomechanical Laboratory, Shanghai University, Shanghai 200072, China | Xiangwen Liao | Design Center of Shape-memory Alloy Implant, Seemine Ltd, Lanzhou 4616088, Gansu Province , China | Liming Wang | Department of Orthopaedics, Nanjing First Hospital Affiliated to Nanjing Medical University,Nanjing 210029,Jiangsu Province, China |
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中文摘要: |
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英文摘要: |
This study was designed to measure the pressure distribution of the intervertebral disc under different degrees of distraction of the interspinous process, because of a suspicion that the degree of distraction of the spinous process may have a close relationship with the disc load share. Six human cadaver lumbar spine L2-L5 segments were loaded in flexion, neutral position, and extension. The L3-L4 disc load was measured at each position using pressure measuring films. Shape-memory interspinous process implants (SMID) with different spacer heights, ranging in size from 10 to 20 mm at 2 mm increments, were used. It was found that a SMID with a spacer height equal to the distance of the interspinous process in the neutral position can share the biomechanical disc load without a significant change of load in the anterior annulus. An interspinous process stabilizing device (IPD) would not be appropriate to use in those cases with serious spinal stenosis because the over-distraction of the interspinous process by the SMID would lead to overloading the anterior annulus which is a recognized cause of disc degeneration. |
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