Investigating the mechanical effect of the sagittal angle of the cervical facet joint on the cervical intervertebral disc oleh Rui Weng, Xue-Cheng Huang, Lin-Qiang Ye, Ce-Kai Yang, Zhuo-Yan Cai, Yue-Rong Xu, Jian-Chao Cui, Sheng-Hui Yi, De Liang, Zhen-Song Yao