Baxter: Actifuse SHAPE vs DBX in ACC

Inclusion Criteria: * The subject has failed conservative treatment and is a candidate for spinal fusion surgery. * The subject is ≥18 years old and of legal age of consent. * The subject is, in the investigator's opinion, psychosocially, mentally, and physically able to fully comply with this protocol, including the post-operative regimen, attend the required follow-up visits, completion of required forms, and be able to understand and provide written informed consent. * The subject is skeletally mature (epiphyses closed). * The subject has voluntarily signed the approved informed consent. * The subject is willing and able to participate in post-operative clinical and radiographic follow up evaluations for 2 years. * No previous surgical intervention at the involved fusion level(s); * Women of child-bearing potential must not be pregnant or nursing, and agrees to not get pregnant for 1 year following surgery Exclusion Criteria: * Subject has systemic infection or infection at the surgical site. * Subject has a medical condition that would interfere with post-operative assessments and care (i.e., metabolic bone disease, neuromuscular disease, autoimmune disease, active malignancy, psychiatric disease, paraplegia, quadriplegia, etc.). * Subject has a concurrent disease process that would place the subject in excessive risk to surgery (i.e. significant circulatory or pulmonary problems, or significant cardiac disease). * Subject has a history (present or past) of substance a…