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¹Ankara University, Faculty of Medicine, Departments of Neurosurgery, Ankara – TURKİYE
² Ankara University, Faculty of Medicine, Departments of Neurology,Ankara - TURKİYE In this study 33 patients with Herniated Lumbar Disc (HLD) were investigated. Dermatomal Somatosensory Evoked Potential (SEP) values were compared with needle Electromyography (EMG), myelography and operative findings. According to the operative findings the patients were divided into two groups: 1) protruded HLD (18 cases) and 2) extruded HLD (15 cases). We found a 26% correlation between the operative findings and the SEP results in patients with extruded HLD, and 11.2% in the protruded HLD group. As a result we found an 18.1% overall correlation between the operative findings and the SEP results. We suggest that dermatomal SEP is not a sensitive method for the diagnosis of HLD. Keywords : Dermatomal Somatosensory Evoked Potential, Herniated Lumbar Disc