The purpose of this study is to evaluate the differences (the effectiveness and the safety) between two different nerve and muscle monitoring devices currently available during a TLIF surgery. The Endoscopic Assisted Retropsoas (EARP) Nerve Cuff Electrode and Retractor surgical and nerve monitoring tools will be used in addition to standard nerve monitoring tools during the surgery. The choice of standard nerve monitoring equipment is based on the decision of the surgeon and technologist and is not dictated by this study. These tools will be compared with regards to safety and ability to accurately monitor the nervous system during the surgery.
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Number of patients that experience an Adverse Device Effect (ADE)
Timeframe: From enrollment through the end of the follow-up assessment at week 6
Ability of EARP System to alert the surgeon to nerve irritation during surgery compared to standard IONM monitoring techniques
Timeframe: During the TLIF surgery.