Each level in the back is a different joint. L4-5 in your back is a joint just like your knee or your shoulder. Herniated discs are joint injuries. The most common cause of a herniated disc is a ...

An MRI scan revealed severe spinal canal stenosis at L3-L4 and L4-L5, as well as a herniated nucleus pulposus on the right at L5-S1 (Figs 11, 12). DC underwent a L3-L5 decompressive laminectomy ...