Safety and Efficacy of the CarboClear Pedicle Screw System

Inclusion Criteria

• Subject has degenerative disc disease (DDD) at one level, from L2 to S1 vertebrae, with up to Grade I spondylolisthesis.

DDD is defined as back pain and/or radicular leg pain with degeneration of the disc confirmed by patient history, radiographic studies, and physical examination, with one or more of the following factors (as measured radiographically, either by CT, MRI or plain film, myelography, discography, etc.):

• osteophyte formation of facet joints or vertebral endplates;
• decreased disc height, on average by > 2 mm;
• scarring/thickening of ligamentum flavum, annulus fibrosis, or facet joint capsule;
• herniated nucleus pulposus;
• facet joint degeneration/changes;
• vacuum phenomenon.
• Subject is candidate for single level intervertebral fusion, with or without posterolateral fusion, with implantation of intervertebral body fusion device and supplemental fixation.
• Subject age is between 21 - 72 years, and subject is skeletally mature.
• Pre-operative low back and/or leg/s pain (debilitating pain that causes a significant disturbance of the routine daily physical activities) ≥ 40 mm on a 100 mm Visual Analogue Scale (VAS).
• Pre-operative Oswestry Disability Index (ODI) score ≥ 40 percentage-point, indicating at least moderate disability (interpreted as moderate/severe disability).
• Low back and/or leg/s pain is unresponsive to prior non-surgical management for a minimum of six months. Non-operative treatment includes pain medication, physical therapy and/or injections.
• Patient must understand and sign the informed consent.
• Patient is willing and able to meet the proposed follow-up schedule including return to follow-up visits and complete necessary study paperwork.
• Patient is willing and able to follow the postoperative management program.

Exclusion Criteria

• Previous fusion or fusion attempts, including anterior fusion or posterolateral fusion, at the index level.
• Previous fusion or fusion attempts at the adjacent levels.
• Prior decompression procedures that include removal of soft and bone tissue at the index or adjacent levels.
• Patient is not skeletally mature.
• Degenerative spondylolisthesis greater than Grade I.
• Spinal instability at the index level with ≥ 3 mm translation and/or ≥ 5 degrees angulation. Determination of instability will be assessed using flexion/extension lateral view radiographs.
• Isthmic spondylolisthesis.
• Radiographically confirmed moderate or severe spinal stenosis with associated neurogenic claudication. Radiographically confirmed moderate/severe stenosis is defined as reduction of ˃50% of central and/or foraminal canal diameter compared to the adjacent uninvolved levels. Neurogenic claudication is leg, groin or buttock pain and/or numbness that worsens with walking or erect posture and is relieved with flexion of the spine.
• Systemic infection or infection at the site of surgery.
• Metabolic bone disease, such as osteopenia, osteoporosis, and osteomalacia. A screening Questionnaire for osteoporosis, SCORE (Simple Calculated Osteoporosis Risk Estimation), will be used to screen patients who require a DEXA bone mineral density measurement. If DEXA is required, exclusion will be defined as measured T-score less than or equal to -2.5 (WHO definition).
• History of Paget's disease or other bone pathologies, whether acquired or congenital, including renal osteodystrophy, untreated or uncontrolled hyperthyrodism, hypothyroidism, hyperparathyroidism, Ehrlers-Danlos-syndrome, osteogenesis imperfecta, achondroplasia, tuberculosis.
• Personal and/or familial history NF2, and/or spinal tumor.
• Ankylosing spondylitis.
• Diffuse idiopathic skeletal hyperostosis (DISH) syndrome.
• Active hepatitis (viral or serum) or HIV positive, renal failure, systemic lupus erythematosus, or any other significant medical conditions which would substantially increase the risk of surgery.
• Immune deficiency disease.
• Patient is recei