This 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.
At least 18 years of age at the time of planned surgery.
Indicated for 1- or 2-level instrumented LLIF surgery (in either prone or lateral decubitus positions), inclusive of the L4-5 disc space.
Written informed consent obtained from subject or subject's legal representative and ability for subject to comply with the requirements of the study.
Patients requiring surgical treatment at more than 2 lumbar levels.
Patients with peripheral neuropathy such as from diabetes or other conditions that might affect the reliability of intraoperative neuromonitoring.
Patients with prior history of partial/full hip or knee joint replacement surgery (i.e., arthroplasty or resurfacing) on the leg targeted for saphenous monitoring and electrode placement.
Patients with presence of a condition or abnormality that in the opinion of the Investigator would compromise the safety of the patient or the quality of the data.
Patients of both sexes undergoing LLIF surgery atone or two levels inclusive of the L4-5 level.
Cohort
Prospective
Somatosensory evoked potential [SSEP] intraoperative monitoring
Diagnostic testNo study specific intervention is performed. Intraoperative neuromonitoring system that is observed in this study is for assessing the health of the lumbar plexus during lateral lumbar interbody fusion surgery
Sensitivity and specificity of SSEP neuromonitoring in post-operative clinical diagnosis of motor/sensory deficits
This outcome measure determines the utility of the saphenous nerve SSEP monitoring based on the correlation of intraoperative neuromonitoring results with new or worsened postoperative neural deficits, as measured by motor and sensory physical exam.
Determination of the positive predictive value (PPV) and negative predictive value (NPV) of free run and SSEP monitoring modalities.
This outcome measure includes: * Correlating specific monitoring findings with incidence of new or worsened motor or sensory deficits post-operatively and their correlation with patient-specific and surgical factors. * Correlating patient and surgical factors with new and worsened postoperative neural deficits.
Click on the lead sponsor to view all of their trials.
