The Objective of the Protocol is to Generate Real World Evidence (RWE) Supporting the Safety, Performance, and Health Economics of Using the Regulatory Approved and Commercially Available EARP Interbody System Used During Lumbar Interbody Fusion (LIF) Procedures With the EARP Nerve Cuff Electrode

This multi-center post-marketing study will include consecutive patients who meet eligibility criteria, are scheduled to undergo a LIF procedure using the EARP Interbody System and EARP Nerve Cuff Electrode, and agree to participate. The study will include patients deemed appropriate for the procedure per the site's judgment, which may include patients with off-label use of the devices. Patients who consent to study participation and meet study criteria will undergo surgery according to site standard procedure. The EARP Nerve Cuff Electrode will be used to monitor nerve roots during surgery. Radiographic imaging will document the fusion status and various disk space parameters, and the Oswestry Disability Index (ODI) will be used to assess function and pain. Data will be collected from standard site follow-up visits at 6 weeks, 3 months, 6 months, and 12 months after surgery. Economic data will be collected to quantify the economics of the EARP Interbody System for LIF procedures.