• Kota Aritaki, Kazuharu Nakagawa, Kanako Yoshimi, Akira Yoshizawa, Shohei Hasegawa, Ryosuke Yanagida, Motonori Hashimoto, Takashi Hirai, Kohei Yamaguchi, Ayako Nakane, Toshitaka Yoshii, Atsushi Okawa, and Haruka Tohara.
• Department of Dysphagia Rehabilitation, Division of Gerontology and Gerodontology, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo Ward, Tokyo, 113-8510, Japan.
• Eur Spine J. 2024 Jan 1; 33 (1): 243252243-252.

PurposeAlthough movement of the hyoid bone is different for masticatory swallowing and liquid swallowing in normal subjects, it has not been studied after cervical spine surgery. Therefore, we analyzed the swallowing dynamics of masticatory swallowing in anterior cervical spine disease surgery using foods that require chewing close to actual meals.MethodsA day before and one week after the surgery, a videofluoroscopic swallow study (VFSS) was performed, and the distance of hyoid bone movement in the anterior and superior directions, amount of opening of the upper esophageal sphincter (UES), time of passage through the pharynx, number of swallows, and amount of pharyngeal residual were measured on the VFSS images during a masticatory swallow of corn flakes. The swallowing function was evaluated by DSS (dysphagia severity scale) and FOIS (functional oral intake scale). Imaging software was used for the measurements.ResultsPostoperative hyoid movement during masticatory swallowing was not significantly different for anterior movement but significantly limited in upward movement (p = 0.002); UES opening volume was significantly decreased (p < 0.001), and bolus residue was significantly worse (p < 0.001), compared to preoperative. The pharyngeal transit time was not significantly different; the number of swallows increased (p < 0.001), along with DSS (p < 0.001) and FOIS (p < 0.001), with significant differences before and after surgery, indicating worsened swallowing function.ConclusionsSwallowing function worsened in masticatory swallowing after surgery for cervical spine disease, mainly due to the restriction of upward movement of the hyoid bone and the resulting increase in pharyngeal residuals after swallowing.© 2023. The Author(s).

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