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Nerve conduction studies in upper limbs of patients with cervical spondylosis and motor neurone disease

ABSTRACT‐ Proximal conduction studies by F‐wave technique, with conventional distal motor and sensory conduction were performed along the ulnar nerves of 20 patients each with cervical spondylotic radiculopathy and/or myelopathy and with classical motor neurone disease (MND). Such F‐wave parameters as shortest F‐latency, F‐conduction velocity, conduction time and F‐ratio were calculated. Twenty‐five age‐ and sex‐matched healthy volunteers acted as controls. Proximal slowing associated with sensory conduction abnormalities and normal distal motor conduction favored cervical spondylosis (CS). Distal slowing with a normal proximal motor and sensory conduction was associated with motor neurone disease.