Prospective Study To Assess The Safety and Efficacy of the PROW LIF Procedure

Inclusion Criteria:main Inclusion Criteria 1. Male and female between 18-65 years of age (skeletally mature). 2. Subjects suffering from degenerative disc disease (DDD) accompanied by back pain with leg pain at a single level between L2 and S1 confirmed by history and radiographic studies and that are scheduled for a fusion operation. DDD is determined to be present if one or more of the following are noted: 1. instability (defined as angulation ≥ 5° and/or translation ≥ 4mm on flexion/extension radiographs); 2. osteophyte formation; 3. decreased disc height; 4. ligamentous thickening; 5. disc degeneration/herniation; or 6. facet joint degeneration. 3. A pre-op Oswestry Low Back Pain Disability Questionnaire (ODI) score of 35 % or more; 4. Be non-responsive to non-operative treatment for at least 6 months; \- Exclusion Criteria: 1. The Antero-Posterior (AP) diameter (at midline) of the involved level is \<31mm. 2. Any previous spinal surgery at the involved level; 3. Spondylolisthesis \> grade I; 4. Ankylosed segment at the affected level; 5. History or radiographic evidence of osteoporotic fractures in the spine; 6. Paraparesis; 7. Progressive neurologic conditions; \-