Fridén T, Sommerlath K, Egund N, Gillquist J, Ryd L, Lindstrand A
University Hospital, Department of Orthopedics in Lund, Sweden.
Acta Orthop Scand. 1992 Dec;63(6):593-8. doi: 10.1080/17453679209169715.
Manual tests and 2 external devices were used together with roentgen stereophotogrammetry (RSA) and an active weight-bearing radiographic method to measure the sagittal laxity in 11 knees with anterior-cruciate-ligament rupture. In 5 knees no ligament surgery had been performed (unstable knees) and in 6 knees a reconstruction had been performed one year before the examination (stable knees). There were positive correlations between all methods, including the manual tests when all knees, both stable and unstable, were analyzed together. However, the mean values of the total displacement differed between the methods, especially when comparing the weight-bearing radiographs with the three other methods. Some knees with substantial displacement during passive loading did not show any displacement when weight bearing; the measurements thus depended on both the ligamentous laxity and the patient's neuromuscular control of the joint. When the stable knees were analyzed separately, higher mean values were recorded with the external devices than with RSA using 180 N load. This could be explained by an error from soft tissue deformation which added to the skeletal displacement when the external devices were used.
采用手动测试和2种外部设备，结合X线立体摄影测量（RSA）和一种主动负重X线摄影方法，对11例前交叉韧带断裂的膝关节矢状面松弛度进行测量。其中5例膝关节未进行韧带手术（不稳定膝关节），6例膝关节在检查前一年进行了重建手术（稳定膝关节）。当对所有膝关节（包括稳定和不稳定的膝关节）进行综合分析时，所有方法之间均存在正相关，包括手动测试。然而，不同方法测得的总位移平均值有所不同，尤其是将负重X线片与其他三种方法进行比较时。一些在被动加载时出现明显位移的膝关节在负重时并未显示出任何位移；因此，测量结果既取决于韧带松弛度，也取决于患者对关节的神经肌肉控制。当单独分析稳定膝关节时，使用外部设备记录的平均值高于使用180 N负荷的RSA测量值。这可以用软组织变形误差来解释，当使用外部设备时，该误差会叠加到骨骼位移上。
