Loss of Motor Evoked Potential in the Exposure Stage of Scoliosis Surgery in a Patient with Kyphoscoliosis.

Somatosensory-evoked potential and motor-evoked potential (MEP) are used during complex spinal surgeries to ensure the neurological integrity of the patient. Here, we report a case of a patient with type 3 thoracolumbar scoliosis whose surgery was stopped due to loss of signal in the neuromonitoring over the right lower limb in the exposure stage, before instrumentation and manipulation. The patient had right lower limb weakness and hence the surgery was abandoned. The same abnormality was present when we tried surgery for the second time. Surgery was aborted and the potentials recovered and the patient woke up without disability. In summary, this case illustrates that changes in MEPs can occur even at early stages in more vulnerable cases and is to be looked for to avoid disability.