摘要
目的探讨下颈椎屈伸运动对其应力分布的影响。方法取5具成人新鲜尸体颈椎标本(C2-C7),通过施加最大载荷为2.34N.m的纯扭矩,使颈椎产生前屈和后伸运动,记示C4、C5、C6前柱,中柱和后柱的应变。结果颈椎前屈时,前柱和中柱承受压应力,后柱承受拉应力,且前柱的应力大于中柱和后柱(P<0.05);后伸时,前柱受拉应力,中柱和后柱承受压应力,且前柱的应力最大(P<0.05)。前柱的应力前屈小于后伸(P<0.01),中柱的应力在前屈和后伸时相差不大,后柱的应力前屈大于后伸(P<0.01)。对于三个椎体相比较而言,前屈和后伸时前柱的应力最大(P<0.01),而C4-6前柱的应力在屈伸时无差别。中柱的应力在前屈时C4、C5较大,与C6有差别(P=0.03),而后伸时无差别。后柱的应力在前屈时,三个椎体无差别(P=0.02)。结论下颈椎屈伸运动过程中应力的变化情况可能与颈椎病的发病机制有一定的关系。
Objective To study the stress distribution of the lower cervical spine in the flexion and extension movement. Methods Five Fresh adult human cervical spinal specimens(C2-C7)were chosen as experimental materials,to measure the strain of the C4-C6 in the flexion and extension movement with 2.34N.m loads. Results In the flexion movement,the anterior and middle columns bears the press stress,the posterior column bears pull stress,and anterior column strain is the highest(P<0.05);In the extension movement,the anterior column bears pull stress,the middle and posteror column bears press strss and the anterior column stress is the highest.(P<0.05).There is no difference in the middle column stress in the flexion and extension movement.The stress of the anterior column is higher in extension movement than in the flexion movement and the posterior column is just reverse. To the different segments,the stress of the middle column of C5 is the highest in the flexion and the posterior column of C5 is the highest in the extension. Conclusion The high part stress of lower cervical spine may be related to the cause of cervical spondylosis.
出处
《颈腰痛杂志》
2004年第6期382-384,共3页
The Journal of Cervicodynia and Lumbodynia
关键词
颈椎
应力分布
屈伸运动
cervical spine
stress distrbution
flexion and extension movement
