脊柱三维运动实验加载方式的改进

目的:改进三维运动实验的加载方式。方法:新鲜羊腰椎标本6例(L1~5),置于脊柱三维运动实验机上进行六个自由度的运动。两次预加载后依次对标本进行3、0、0.3Nm的加载,并采集三种加载时的运动图像。3Nm加载及0加载的图像作为传统加载方式计算出脊柱的运动范围及中性区,3Nm加载及0.3Nm加载的图像作为新的加载方式计算出新的脊柱运动范围及中性区,再对两种计算方法得出的运动范围及中性区进行配对t检验,计算两种方法各自的变异率,并进行配对t检验。结果:两种方法得到的运动范围之间不存在差异(P=0.105),但中性区之间存在显著性差异(P=0.013)。采用新的加载方式得到的运动范围的变异系数比以往的方法要小得多(P<0.001)。结论:采用新的加载方式可以得到较为准确的脊柱运动的运动范围。

The improvement on load methods of 3-D spine motion

Objective: To improve the load methods of the measurement of 3-D spine motion. Methods: 6 flesh lumbar vertebrae (L1~L5) of sheep were harve sted, and were placed on the 3-D spine motion test machine to get the motion of 6 freedom degrees. After twice preloading these specimens were applied the momen ts of 3Nm, 0, 0.3 Nm in turn. The images of the motion were photographed. The im ages of the moments of 3 Nm and 0 were used to calculate the neutral zone (NZ) a nd range of motion (ROM), acted as the traditional way, while the images of the moments of 3Nm and 0.3Nm were used to calculate the new NZ and ROM, acted as the new way. These two calculations of NZs and ROMs were analyzed using the paired-sample t test, and the coefficients of variation (CV) were also calculated and a nalyzed using the paired-sample t test. Results: ROM had no difference between t wo ways (P =0.105), while NZ had (P =0.013). The new method had far less CV than the traditional method (P <0.001). Conclusion: The new way of load can get quit e accurate ROM of spine motion.