<qa>  What is the name of the symptom of DDD?- Degenerative Disc Disease DDD in one or two adjacent vertebral levels between L3 and S1. Diagnosis of DDD requires: aBack andor leg radicular pain; and bRadiographic confirmation of any 1 of the following by CT, MRI, discography, plain film, myelography andor flexionextension films: Instability greater than or equal to 3mm translation or 5 angulation; Decreased disc height 2mm; Scarringthickening of annulus fibrosis; Herniated nucleus pulposus; or Vacuum phenomenon. 