This is a pilot study to evaulate the safety and prelimary effectiveness of Prefix as compared to autogenous bone for spinal fusion procedures in skeletally mature subjects with degenerative disc disease (DDD) at one level from L2-S1.

Inclusion Criteria:

• Documented diagnosis of DDD requiring single level fusion (L2-S1) with up to Grade I Spondylolisthesis
• Have a preoperative screening qualifying VAS and ODI scores
• Be a skeletally mature male or a non-pregnant, non-lactating female, age 18 -70 inclusive
• Have not been sufficiently responsive to at least 6 months of non-operative treatment prior to study enrollment

Exclusion Criteria:

• Are female subjects who are pregnant or nursing, or women planning to become pregnant during the first year (12 months) following the surgery
• A history of previous surgery in the lumbar spine with or without attempted fusion
• Grade II or greater spondylolisthesis
• More than 0 degrees of kyphosis at the operated disc space
• Evidence of scoliosis in the lumbar region of more than 10 degrees
• Collapsed disc space with bridging osteophytes
• A systemic or local infection at the site of surgery
• An acute fracture of the spine at the time of enrollment in the study
• An active history of systemic malignancy
• A medical condition, serious intercurrent illness, or extenuating circumstance that, in the opinion of the Investigator, would preclude participation in the study
• A known hypersensitivity to any of the components of the product or a known titanium allergy or a known allergy to polyetheretherketone (PEEK)
• A history of any autoimmune disease, such as, systemic lupus erythematosus, Addison's disease, Crohn's disease, or rheumatoid arthritis
• A history of any severe allergy or anaphylaxis, or a history of hypersensitivity to protein pharmaceuticals, or have had any previous exposure to a protein pharmaceutical
• Are receiving treatment (before or during surgery) with a drug (e.g., steroids, methotrexate, etc.) that interferes with bone metabolism or are being treated with a bone growth stimulator
• A medical condition requiring radiation, chemotherapy or immunosuppression, or a medical condition requiring systemic corticosteroids
• Are covered under workmen's compensation insurance or prisoners
• Are transient or have been treated in the last 6 months before enrollment for alcohol and/or drug abuse in an in-subject substance abuse program
• Have participated in clinical studies within 3 months of enrollment
• Have a body mass index (BMI) greater than 35
• Use tobacco products (also includes, e.g. nicotine patch or nicotine gum), or have smoked cigarettes within 6 weeks preceding enrollment
• Known to require additional surgery to the lumbar spinal region within the next 6 months
• Have symptomatic multilevel degenerative disease requiring possible instrumented fusion of more than one vertebral level
• Have previously been treated with, or exposed to, therapeutic levels of Bone Morphogenetic Proteins (BMPs), i.e., synthetic or recombinant
• Have a documented medical history or radiographic evidence of a metabolic bone disease (e.g., osteoporosis or osteopenia) or other condition which would negatively impact the bone healing process (e.g. history of Paget's disease, osteomalacia, or other osteodystrophy) or preclude the subject from receiving pedicle screw fixation
• Are involved in or planning to engage in litigation related to back and/or leg pain
• Require chronic SQ or IV heparin therapies
• Have an Osteoporosis Risk Assessment Instrument (ORAI) score > to 9 points and, if so, will require a qualifying DEXA scan T score