Kono Reika, Ohtsuki Hiroshi, Okanobu Hirotaka, Kinugasa Kazushi
Department of Ophthalmology, Okayama University Graduate School of Medicine and Dentistry, Japan.
Am J Ophthalmol. 2005 Jul;140(1):144-6. doi: 10.1016/j.ajo.2004.12.034.
To elucidate the coronal plane locations of extraocular muscle (EOM) pulleys following torsional muscle surgery.
Case report.
A 76-year-old man underwent advancement of the anterior part of the inferior oblique muscle to treat full macular translocation-induced incyclotropia. Postoperatively, magnetic resonance imaging was used to obtain contiguous, 2-mm-thick coronal orbital images. On each MRI image, the cross-sectional area and center of the EOM was computed, and all rectus EOM positions were translated to the coordinate origin at the area centroid of the globe at the level of pulleys.
The superior rectus pulley was displaced temporally, and the lateral rectus pulley was displaced inferiorly more than 2 SD from normal subjects. Coronal plane locations of EOM pulleys of the ipsilateral eye showed extorsion compared with that of the contralesional eye.
Torsional muscle surgery causes an extorsional shift of the superior and lateral rectus pulleys.
阐明扭转肌手术后眼外肌（EOM）滑车在冠状面上的位置。
病例报告。
一名76岁男性接受下斜肌前部前移术以治疗完全黄斑移位引起的内旋转斜视。术后，使用磁共振成像获取连续的2毫米厚冠状位眼眶图像。在每张MRI图像上，计算眼外肌的横截面积和中心，并将所有直肌眼外肌的位置在滑车水平处平移至眼球面积质心的坐标原点。
上直肌滑车向颞侧移位，外直肌滑车向下移位超过正常受试者2个标准差。与对侧眼相比，同侧眼眼外肌滑车的冠状面位置显示有外旋。
扭转肌手术导致上直肌和外直肌滑车向外旋移位。
