• Yuichi Takahashi, Takao Yasuhara, Shinji Kumamoto, Kotaro Yoneda, Takashi Tanoue, Masayuki Nakahara, Takafumi Inoue, Yasukazu Hijikata, Tejin Lee, Cesario V Borlongan, Koichi Ogawa, and Kenki Nishida.
• Department of Spine and Spinal Surgery, Shinkomonji Hospital, 2-5, Dairishinmachi, Moji, Kitakyushu, Fukuoka 800-0057, Japan. yuichi5356@yahoo.co.jp
• Eur Spine J. 2013 Jan 1;22(1):178-82.

PurposeCervical disc herniation (CDH) is found more frequently at the lower cervical spine than at the upper or middle level. However, there is scarcity of data about the laterality of CDH. The aim of this study is to detect the laterality of CDH.MethodsWe retrospectively evaluated preoperative computed tomography myelograms and magnetic resonance images of 75 cases of CDH who underwent single level anterior cervical discectomy and fusion at C4-5, C5-6, or C6-7 levels from 2008 to 2010 in our institute. Statistical analyses were performed using the Chi-square test.ResultsEleven cases were found at C4-5 level, 42 cases at C5-6 level, and 22 cases at C6-7 level. At C4-5 level, CDH was recognized at the right side in 2 cases, at the left side in 2 cases, and at the center in 7 cases. At C5-6 level, CDH was found at the right side in 20 cases and at the left side in 22 cases. At C6-7 level, CDH was found at the right side in 3 cases and at the left side in 19 cases with significantly high frequency of left-sided CDH (p < 0.025).ConclusionsIn this study, it was revealed that the left-sided CDH was more frequent than the right-sided CDH at C6-7 level.

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