Abstract
Among 124 patients with cervical spondylosis who were operated on during the past 6 years at our clinic, cervical spondylotic amyotrophy was noted in 5 patients (4.0%). Severe weakness with marked muscle atrophy in the segmental distribution was a cardinal sign of neurological findings in all cases.But two cases out of five had long tract sign and four cases had minimal sensory disorder. Myelography and selective angiography were performed on all cases.The level of muscle atrophy corresponded well with that of block found in the cervical myelogram. The gap of levels between muscle atrophy and myelogram, however, was observed in one case. The gap of those levels and the findings of angiogram suggested that the circulatory failure of spinal cord, not only compression, perticipates in the mechanism of CSAM.In our opinion, putting the operative findings together, there are 3 types of lesions impaired in CSAM: ventral horn cell, anterior root, and both ventral horn cell and anterior root.
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