推拿手法作用的实验应力分析

experimental stress analysis of manual manipulation effect

目的:观察不同着力点、不同角度的纵向牵拉力作用下,颈椎关节的应力变化。方法:采用光弹材料按1:1比例制成颈椎模型,通过计算模型上形成的等差干涉条纹级数,分别观察C4-7颈椎关节后缘在各种拉力作用下的应力分布。结果:颈椎模型受力后,摄下光屏上清晰的等差干涉图谱,计算结果显示,着力于C2且以15°的牵拉力作用时,C4-7关节后缘的作用力普遍较大,尤其C4-5;当牵拉力的角度为20°～25°、且作用于C1、C2时,表现为C5-6,C6-7应力最大。结论:颈椎关节后缘所受应力大小与牵引力的着力点和方向之间存在密切关系,对临床施行颈椎推拿手法治疗时,视病变关节的不同,选择相应的着力点和相应的方向。

objective: To observe the variations of stress magnitude in the cervical vertebra exerted by vertical traction force from various angles and different points, methods: The cervical vertebra model was produced by using elastic material of light (polycarbonate) and silica rubber (1:1). By calculating the arithmetical progression of interference fringe. The author judged the stress magnitude in the posterior edge of the C4-7 vertebral bodies when different kinds of pulling force acted on. result: The interference pattern was seen clearly on the screen while the force acted on the model. When the pulling force acted on C, or C2, the force was acting at an angle of 150the maximum of the stress presented in C4-5 and when the force acted at an angle of 25 the maximum stress presented in C5-6 and C6-7. conclusion: The stress distributed upon the posterior edge of the vertebral joints is closely related to the points that the force aced on and the direction of the force . Appropriate points and direction of the pull should be selected according to the change of the lesion joints when manual manipulation is used for the treatment of cervical vertebral disease.