Motor involvement in common peroneal neuropathy (CPN)-frequently shows a sele ctive pattern with regard to deep and superficial divisions of the peroneal nerv e, by clinical examination and needle electromyography. Th...Motor involvement in common peroneal neuropathy (CPN)-frequently shows a sele ctive pattern with regard to deep and superficial divisions of the peroneal nerv e, by clinical examination and needle electromyography. The involvement of the s ensory branch of the superficial peroneal nerve (SPN) has not been well establis hed using nerve conduction studies. Among 42 cases of electrophysiologically def ined CPN in 35 patients, 37 (88%) had clinical or electrophysiologic evidence f or SPN involvement, but only 20 had diminished superficial peroneal sensory resp onse (SPSR) amplitudes. Many of the cases involving normal SPSRs had significant axonal loss involving deep peroneal motor fibers. Sparing of the superficial pe roneal sensory fibers provides further evidence for the selective vulnerability of different nerve fascicles to injury. This is an important pattern to recogniz e; from a practical standpoint, focal segmental conduction abnormalities in the motor nerve and EMG findings can help to differentiate these lesions from L-5 r adiculopathy.展开更多
文摘Motor involvement in common peroneal neuropathy (CPN)-frequently shows a sele ctive pattern with regard to deep and superficial divisions of the peroneal nerv e, by clinical examination and needle electromyography. The involvement of the s ensory branch of the superficial peroneal nerve (SPN) has not been well establis hed using nerve conduction studies. Among 42 cases of electrophysiologically def ined CPN in 35 patients, 37 (88%) had clinical or electrophysiologic evidence f or SPN involvement, but only 20 had diminished superficial peroneal sensory resp onse (SPSR) amplitudes. Many of the cases involving normal SPSRs had significant axonal loss involving deep peroneal motor fibers. Sparing of the superficial pe roneal sensory fibers provides further evidence for the selective vulnerability of different nerve fascicles to injury. This is an important pattern to recogniz e; from a practical standpoint, focal segmental conduction abnormalities in the motor nerve and EMG findings can help to differentiate these lesions from L-5 r adiculopathy.