Classification of Foraminal Stenosis on Sagittal MRI Images Yasuaki MURATA 1 , Masahiro SHIBA 1 , Kohichi KANAYA 1 , Hiroyoshi WADA 1 , Keiji WADA 1 , Satoshi HATTA 1 , Ken KATO 1 , Yoshiharu KATO 1 1Department of Orthopaedic Surgery, Tokyo Women's Medical University Keyword: 腰部脊柱管狭窄症(lumbar spinal canal stenosis) , 椎間孔狭窄(foraminal stenosis) , MRI矢状断像(sagittal MRI) pp.1079-1083
Published Date 2013/11/25
DOI https://doi.org/10.11477/mf.1408102876
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 Background:Foraminal stenosis of the lumbar spine can cause lower limb pain. However, it is difficult to diagnose foraminal stenosis on MRI scans, because sometimes the compression of the spinal nerve is not visible on 2-dimensional images. The purpose of this study was to classify the shapes of the stenosed foramina on sagittal MRI scans, and to apply a classification system that we devised to making the diagnosis.

 Method:Electromyography, nerve-conduction studies, neurological findings, and spinal nerve infiltration have been used to detect foraminal stenosis, and while these methods are useful, they are not suitable for screening.

 Outcome:Our results showed that 36% of the patients whose foraminal space was occupied by a disc above the cranial edge of the disc had symptoms of foraminal stenosis. Moreover, 54% of these patients had symptoms at the L5/S.

 Conclusion:Sagittal MRI can be a convenient examination for detecting foraminal stenosis.

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