what is disc displacement
Displacement of a lumbar disc refers to protrusion or herniation of the nucleus pulposus, of the cushion-like disc resting between any two of the five lumbar vertebrae (vertebrae L1 through L5) in the lower spine.his is differentiated from a âbulgingâ disc, which describes deformity of the annulus concentrically. A disc herniation usually occurs on one side of the midline at the posterior part of the disc. Herniated discs are most common in the lower levels of the lumbar spine (L4-L5 and L5-S1).