成人枕骨厚度解剖学和CT测量的相关性研究

The correlation between anatomical measurement and CT measurement of the adult occipital thickness

目的了解枕骨厚度解剖学与CT两种测量结果的相关性,为枕颈融合术中螺钉长度的选择提供解剖学依据。方法对10具成人湿润颅骨标本进行CT和解剖学测量,测量方法参照McRac线,共66个点,每格相距1cm的矩阵,并对两组数据的相关性进行统计学分析。结果两组数据具有良好的相关性。最厚处位于枕骨粗隆部,最薄处位于小脑窝处,其中厚度大于8mm的区域位于水平线P5、6间ML线旁开2cm、P4、5间ML线旁开1cm及P3、4间ML线处的近似倒三角形区域;厚度介于6～8mm的区域位于上述倒三角形外周1cm的区域。结论各枕骨之间的厚度存在个体差异,CT和解剖学测量结果具有良好的相关性,术前CT测量结果可为术中螺钉长度选择提供参考依据。

Objective To study the correlation between anatomical measurement and CT measurement of adult occipital thickness so as to provide anatomic evidence for the selection of screw length in occipital-cervical fusion. Methods The occipital thickness was measured on the occipital specimens of 10 normal adults in two ways： direct anatomic measurement and CT measurement. Measurements were made on the basis of the McRac＇s line and according to a matrix of 66 points following a grid with one cm spacing. The results of both measurements were statistically analyzed using SPSS 10. 0. Results The results of both measurements were highly correlated. The external occipital protuberance was the thickest while the region of cerebellar fossa was the thinnest. The regions two cm lateral to the midline between plane Five and plane Six, one cm lateral to the midline between plane Four and at plane Five, and median between plane Three and plane Four were found to have a thickness of more than eight mm. Conclusions The occipital thickness varies with individuals. CT measurement and direct anatomic measurement are highly correlated. Preoperative CT measurements can be reliable evidence for optimal screw placement before performing occipital-cervical fusions.