 The registry is design to collect data prospectively on patients undergoing spinal fusion using the VariLift-L, VariLift-A, or VariLift-C device patients will be enrolled in the registry after reviewing the protocol with their health care provider and signing the informed consent. Data will be collected at recommended time points based on the standards of care of the participating sites. The registry will serve as a database in which retrospective analysis and exploratory analysis of specific research questions will be answered. 