“…13 A discectomy or lesion of the anulus fibrosis has been observed as seminal to spinal instability. 2,9,14,19,20 Vertebral body lesions clearly result in severe spinal instability in instances of trauma 10,16 -18,21,22 as well as metastatic disease. 3,[23][24][25][26] Using modeling approaches, the role of the uncovertebral joints in load sharing and cervical motion has recently been proven to be quite significant.…”