RecruitingDiagnostic testIntraoperative Monitoring for the Lateral Lumbar Interbody Fusion ProcedureThis study is designed to evaluate the clinical utility of a known intraoperative neuromonitoring modality (SSEP) using saphenous nerve as the site of stimulation to identify changes to the lumbar nerves which may be at risk during the lateral lumbar interbody fusion (LLIF) procedure.