Radiographic Analysis Using PureGen Versus Autologous Bone in Posterolateral Fusion (PLF)

A Radiographic Analysis Using PureGen Osteoprogenitor Cell Allograft Versus Autologous Bone in Posterolateral Fusion in a Side-by-Side Comparison in the Same Patient (PLF)

The purpose of this study is to evaluate the rate and quality of fusion of PureGen Osteoprogenitor Cell Allograft, compared to autograft bone in instrumented posterolateral fusion (PLF) procedures.

This is a prospective, multi-center, observational, self-control study assessing screened and consented subjects undergoing instrumented posterolateral fusion for degenerative disc disease (DDD) at 1 to 2 contiguous levels between L1 and S1.

Patients diagnosed with DDD will be screened for enrollment based on inclusion and exclusion criteria outlined in this protocol. Subjects who are successfully screened and sign an informed consent will undergo PLF surgery utilizing PureGen, Alphagraft ProFuse Demineralized Bone Scaffold (DBS), and ZODIAC, Illico, or Xenon Fixation system (pedicle screw and rod fixation system)

Subjects will be followed at 6 weeks, 3, 6, 12 and 24 month post-operative visits. Standard radiographs will be taken at these visits to evaluate fusion rate and quality. Oswestry Disability Index (ODI) and Visual Analog Scale (VAS) self-assessment questionnaires and neurological exams will be administered to measure pain and function scores. A computerized tomography (CT) scan will be taken at the 6-month to further assess rate and quality of fusion. A conditional 12 and 24 month post operative CT may also be taken. Procedure related and PureGen related adverse events will be monitored throughout the study.

Inclusion Criteria:

• Symptomatic lumbar degenerative disc disease in up to two contiguous levels between L1 and S1
• Subjects with back and/or leg pain indicated for posterior stabilization with or without decompression at any level and posterolateral fusion (PLF)
• Unresponsive to conservative treatment for at least 6 months
• Radiographic evidence of primary diagnosis

Exclusion Criteria:

• More than 2 levels requiring posterolateral fusion
• Spondylolisthesis greater than Grade I
• Prior failed fusion surgery at any lumbar level(s)
• Systemic or local infection in the disc or cervical spine, past or present
• Active systemic disease
• Osteoporosis, osteomalacia, or other metabolic bone disease that would significantly inhibit bone healing
• Use of other bone graft, Bone Morphogenetic Protein (BMP) or bone graft substitutes in addition to or in place of those products specified
• BMI greater than 40
• Use of post operative Spinal Cord Stimulator (SCS)
• Known or suspected history of alcohol and/or drug abuse
• Involved in pending litigation or worker's compensation related to the spine
• Pregnant or planning to become pregnant during the course of the study
• Insulin-dependent diabetes mellitus
• Life expectancy less than duration of study
• Any significant psychological disturbance that could impair consent process or ability to complete self-assessment questionnaires
• Undergoing chemotherapy or radiation treatment, or chronic use of oral or injected steroids or prolonged use of non-steroidal anti-inflammatory drugs.
• Known history of hypersensitivity or anaphylactic reaction to dimethyl sulfoxide (DMSO)