The results showed that of all nerve roots,pulling with 100g weight,11.59% displaced less than 1cm,78,26%1 2cm and 10.14% more than 2cm.

• 结果：100g牵拉力的作用下，神经根袖位移在1cm以下者占11?59%25，位移在1－2cm者占78?26%25，位移在2cm以上者占10?14%25。