Toriumi Masahiro, Nagasao Tomohisa, Itamiya Tomoki, Shimizu Yusuke, Yasudo Hiroki, Sakamoto Yoshiaki, Ogata Hisao, Kishi Kazuo
Department of Plastic and Reconstructive Surgery, Keio University, Tokyo, Japan.
Department of Plastic and Reconstructive Surgery, Keio University, Tokyo, Japan.
J Craniomaxillofac Surg. 2014 Jul;42(5):397-402. doi: 10.1016/j.jcms.2013.06.003. Epub 2013 Jul 24.
When fractured, zygomas rotate and dislocate. The present study quantitatively elucidates the pattern of the rotation.
50 patients with tri-pod-type zygoma fractures were involved in this study. After defining a 3-dimensional coordinate system--consisting of the M-L axis (the axis directed from the medial to lateral side of the skull), I-S axis (directed from the inferior to superior side), and P-A axis (directed from the posterior to anterior side), the degree with which the fractured zygomas rotated around each of these axes was measured using 3-dimensional graphic software. Thereafter, the tendency of the rotation was compared between the three rotational axes.
Rotation around the I-S axis was the most frequent with a 96% incidence, followed by a substantial margin by rotation around the M-L axis with a 26% incidence; rotation around the P-A axis was rare, with an incidence of 10%. Furthermore, the degree of P-A axis rotation was minor compared to I-S and M-L axis rotations.
The main factor of zygoma dislocation in zygoma fracture is rotation around the I-S axis. This finding is helpful for effective performance to reposition fractured zygomas.
颧骨骨折时会发生旋转和移位。本研究定量阐明了旋转模式。
本研究纳入了50例三脚架型颧骨骨折患者。在定义了一个三维坐标系（由M-L轴（从颅骨内侧指向外侧的轴）、I-S轴（从下向上指向的轴）和P-A轴（从后向前指向的轴）组成）后，使用三维图形软件测量骨折颧骨围绕这些轴各自旋转的程度。此后，比较了三个旋转轴之间的旋转趋势。
围绕I-S轴的旋转最为常见，发生率为96%，其次是围绕M-L轴的旋转，发生率为26%，两者相差较大；围绕P-A轴的旋转很少见，发生率为10%。此外，与I-S轴和M-L轴的旋转相比，P-A轴的旋转程度较小。
颧骨骨折中颧骨移位的主要因素是围绕I-S轴的旋转。这一发现有助于有效地对骨折颧骨进行复位。
