Virtuos Bone Graft in Lumbar Fusion

Inclusion Criteria: Subject must be 18 years of age (≥ 18 years) or older at the time of consent. * Subject must undergo lumbar interbody fusion study at 1-2 contiguous levels. * Virtuos must be the primary bone graft (≥ 50% of the total graft volume) and may be augmented with autograft or cortical or cancellous bone chips. * Subject must be willing and able to sign an informed consent document. * Subject must be willing and able to return for all follow-up visits, agree to participate in postoperative clinical and radiographic evaluations, and comply with the required study protocol.- Exclusion Criteria: * Subject is under 18 years of age (\<18) at the time of consent. * Subject has had prior lumbar spine fusion surgery at any level. * Subject has greater than grade 1 spondylolisthesis of the lumbar spine. Subject is currently undergoing treatment for malignancy or has undergone treatment for malignancy in the past 5 years (benign skin cancer is permitted) * Subject has an active local or systemic infection or is undergoing adjunctive treatment for local or systemic infection