Retrospective/Prospective Data Collection on the LDR ROIA Interbody Fusion Device With VerteBRIDGE Plating

Inclusion Criteria: * Subjects must have degenerative disc disease (DDD) of the lumbar spine between L2 and S1 * Subjects may have up to a Grade 1 spondylolisthesis at the involved level(s) * Subject must have the ROI-A® device at one level or at two contiguous levels between L2 and S1 only * Subject should have had a minimum of 6 months non-surgical treatment prior to receiving the ROI-A® device * Subject may have had NO MORE THAN two previous non-fusion surgeries to the lumbar spine at the same levels as the ROI-A® * Subject must be at least 21 years of age at the time of surgery * Subject must be willing to signed an informed consent document and return for a 12 month visit Exclusion Criteria: * Subject had more than Grade 1 spondylolisthesis at the operated level * Subject is a prisoner. * Subject was pregnant at the time of surgery. * Subject had an active infection or sepsis at the time of surgery.