ANALYSIS OF KNEE KINEMATICS- An MRI study of the normal, anterior cruciate injured, and reconstructed knee.

膝关节前十字韧带损伤的人往往会在这个膝关节发展成骨关节炎，可能是因为韧带撕裂造成的不稳定改变了关节表面的磨损模式。有几项使用身体膝盖的研究考察了切割前十字韧带对关节表面的影响，但很少有人自愿移动。这项研究计划使用一个膝盖和一个正常膝盖十字韧带撕裂的人的核磁共振图像。受试者将模拟在MRI磁铁中靠在一个有重量的踏板上的下蹲。这些图像将以15度的膝关节运动间隔拍摄。将测量关节表面之间的接触点，并将其与正常膝关节进行比较。这种成像将在手术修复后重复进行，然后在两年后再次进行，以评估是否恢复了正常的运动模式。

People with anterior cruciate ligament damage to the knee tend to develop osteoarthritis in this knee, perhaps because the instability produced by the ligament tear changes the patterns of wear on the joint surfaces. There are several studies using cadaver knees which examine the impact on the joint surfaces of cutting the anterior cruciate ligament, but very little of people moving voluntarily. This study plans to use MRI images of people with a torn cruciate ligament in one knee, and one normal knee. The subjects will simulate a squat inside the MRI magnet against a weighted footplate. The images will be taken at fifteen degree intervals of knee movement. The contact points between the joint surfaces will be measured and compared to the normal knee. This imaging will be repeated after surgical repair, and then again two years later, to assess whether the normal movement pattern has been restored.