文章摘要
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
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:
      
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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