This exempt, minimal risk, prospective, post-market, registry, multi-center, Institution Review Board (IRB) approved observational clinical evaluation was conducted at 10 centers. A total of 197 patients were enrolled. The evaluation collected data in a real-world patient population and was a data collection initiative only. No patient treatments or care were performed as a component of the protocol. All patient care received was on-label and standard of care for lateral lumbar interbody fusions. The data collected in this evaluation is intended to contribute to the body of literature for lateral lumbar interbody fusions.

The purpose of this study was to collect data that reports on the clinical outcomes of patients that were treated with the Spineology Rampart DUO device in a standard of care instrumented lateral lumbar interbody fusion procedure at one or two contiguous levels from L2-L5. Data was collected prospectively at specified time points per protocol and included both objective and subjective measures. The study concluded when the final patient achieved their 12-month evaluation.

Inclusion Criteria:

• A clinical decision has been made to treat the patient with the Rampart Duo Interbody Spacer prior to enrollment into this research evaluation. This decision is independent (made outside) of the decision to take part in the research.

Exclusion Criteria:

• Previous interbody fusion or total disc replacement at the index level(s).
• Enrolled in a concurrent clinical investigation that may confound the findings of the present investigation.

Real-world population consistent with cleared labeling for the product.

IPD will be shared with study researchers for purposes of publication and presentation purposes.