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The effects of a new shape-memory alloy interspinous process device on the distribution of intervertebral disc pressures in vitro
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This study was supported by the Medical Key Technology Development Program, Nanjing Health Bureau (ZKK08010).

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    Abstract:

    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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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(自然科学版),2010,(2):115-123

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  • 收稿日期:2009-09-03
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