Abstract
There has been no prospective study on age-related changes of the extensor muscles of the cervical spine in healthy subjects. This study was conducted to elucidate any association between the changes in cross-sectional area of the extensor muscles of the cervical spine on MRIs and cervical disc degeneration or the development of clinical symptoms. Sixty-two subjects who underwent MR imaging by a 1.5-Tesla machine between 1993 and 1996 as asymptomatic volunteers in a previous study were recruited again 10 years later for this follow-up study. The mean interval between the studies was 11.0 ± 0.7 years. The cross-sectional areas of the multifidus, semispinalis cervicis, semispinalis capitis, and splenius capitis at C3–C4, C4–C5, and C5–C6 intervertebral levels were measured on T2-weighted axial images using Image J 1.42. The mean cross-sectional areas of the deep extensor muscles were 1,396.8 ± 337.6 mm2 at the C3–C4 level, 1,514.7 ± 381.0 mm2 at the C4–C5 level, and 1,542.8 ± 373.5 mm2 at the C5–C6 level in the previous investigation. The cross-sectional areas were 1,498.7 ± 374.4 mm2 at the C3–C4 level, 1,569.9 ± 390.9 mm2 at the C4–C5 level, and 1,599.6 ± 364.3 mm2 at the 10-year follow-up. An increase in the cross-sectional area of the muscles was more frequently observed in subjects in their tens to thirties in the initial study, while a decrease was more frequently observed in those in their forties and older in the initial study. Disc degeneration was not correlated with a change in extensor muscle volume. Development of shoulder stiffness during follow-up was significantly negatively correlated with a change in the cross-sectional area of the deep extensor muscles.
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Acknowledgments
This study was supported by a grant from the General Insurance Association of Japan. We thank Dr. Takeshi Ikegami of the Department of Orthopaedic Surgery of Keio University, Dr. Kota Watanabe M.D. of the Advanced Therapy for Spine and Spinal Cord Disorders, Keio University, Takeshi Hashimoto M.D. of the Department of Orthopaedic Surgery, Keio University Tsukigase Rehabilitation Center, Dr. Tomoo Inoue of the Department of Orthopaedic Surgery, Kyorin University, Dr. Masahiko Watanabe of the Department of Orthopaedic Surgery, Tokai University, Dr. Yoshiji Suzuki of the Omaezaki Municipal Hospital, and Mr. Toshio Watanabe of the Central Radiotechnology Department of Keio University Hospital for their help with this study.
Conflict of interest
Morio Matsumoto receives a consulting fee from Medtronic Japan and Kyoei Fire & Marine Insurance and has received an honorarium from the General Insurance Association of Japan for giving a workshop. Kazuhiro Chiba has received an honorarium from the General Insurance Association of Japan for giving a workshop. The other authors have no conflict of interest.
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Okada, E., Matsumoto, M., Ichihara, D. et al. Cross-sectional area of posterior extensor muscles of the cervical spine in asymptomatic subjects: a 10-year longitudinal magnetic resonance imaging study. Eur Spine J 20, 1567–1573 (2011). https://doi.org/10.1007/s00586-011-1774-x
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DOI: https://doi.org/10.1007/s00586-011-1774-x