活体后交叉韧带MRI功能解剖学研究

Functional anatomy of the posterior cruciate ligament in vivo with MRI

目的：研究活体后交叉韧带（Posterior cruciate ligament,PCL）功能解剖学的变化。方法：本组30例自愿者,共40侧膝关节,平均年龄23岁。应用三维MRI序列对每个膝关节行5种体位扫描,膝伸直位（屈膝0°）和屈膝位（30°、60°、90°、120°）,经斜矢状和斜冠状面图像重建,测量PCL长度及仰角和偏离角的变化,并观察解剖形态学变化。结果：屈膝0°~90°PCL长度随屈膝度增加而增加,屈膝120°时,PCL长度变短。随屈膝度增加偏离角逐渐变小,当屈膝达120°时,偏离角又增大。PCL仰角于屈膝30°时最小,屈膝120°时最大。结论：应用MRI技术可行PCL功能解剖学研究。

Objective：To research the functional anatomic change of the posterior cruciate ligament（PCL） in vivo.Meth-ods：A total 40 knees from 30 healthy subjects,with mean age of 23 years,were studied to measure the change of the length and the deviation,and the elevation of PCL,and to observe the architecture of PCL on oblique coronal and sagital images at different flexion of the knees（0°,30°,60°,90°,120°） with MRI 3-dimensional multi-echo data imaging combination（3D-MEDIC） sequence.Results：The PCL elongated from 0° flexion to 90° flexion and shortened up to 120° flexion.The deviation of PCL decreasea from 0° flexion to 90° flexion but increased up to 120° flexion.The elevation of PCL was the smallest at 30° flexion and the largest at 120° flexion.Conclusion：It is feasible to make 3D-MEDIC of MRI to study the functional anatomy of PCL in vivo.