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Arch Orthop Trauma Surg. 1996;115(3-4):203-5.

Atrophy of the nuchal muscle and change in cervical curvature after expansive open-door laminoplasty.

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Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan.


We analyzed computed tomography (CT) images and plain X-ray films of 53 patients who had undergone expansive open-door laminoplasty, in a 3-year study. The relationship between the postoperative changes in the nuchal muscles and those in the cervical curvature was investigated. On postoperative CT images, the cross-sectional area of all nuchal muscles was reduced to approximately 80% of its preoperative size. This atrophic change was especially intense in the multifidus muscle and the semispinalis cervicis muscle. Postoperative cross-sectional area of the deep nuchal muscles was reduced approximately 30% from its preoperative size. No significant correlation was found between the all cross-sectional area of the nuchal muscles and the cervical curvature. However, a weak correlation was found between the deep nuchal muscles area and the curve index (correlation coefficient 0.29).

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