The function of sural nerve in 6 cases of myelopathy and in 15 cases of spinal cord injury was assessed by recording the amplitudes of sensory nerve action potentials (SNAPs) and conduction velocities. In 6 cases of myelopathy and in 12 cases of spinal cord injury SNAPS were obtained. In all cases of myelopathy and in g cases of spinal cord injury the amplitude of sural SNAPS remained within the normal range. Sensory conduction velocities were generally normal when obtainable. If the amplitude of SNAPs are below the normal range in the cases of myelopathy or spinal cord injury, we have to consider the complication of the peripheral nerve damage.
