The effects of a new shape-memory alloy interspinous process device on the distribution of intervertebral disc pressures in vitro
Shengnai Zheng
Qingqiang Yao
Li Cheng
Yan Xu
Peng Yuan
Dongsheng Zhang
Xiangwen Liao
Liming Wang
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.
机标关键词：in vitrointervertebral discpressure distributiondifferentrelationshiplumbar spinesignificantwould
分类号：R3(基础医学)
资助基金：the Medical Key Technology Development Program, Nanjing Health Bureau(ZKK08010)
论文发表日期：2010-01-01
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：9( 115-123 )
英文信息