"it may rupture or bulge - like a bleb on a tire, allowing the inner nucleus pulposus material to leak out." This is what a herniated disc is, and the pain and impeded movement associated with one ...

A similar trend of increased prevalence of disc herniation was noted with more caudal levels. At the L5/S1 level, 58% were found to have an element of disc displacement, most of which were disc bulges ...