Ramsey D K, Lamontagne M, Wretenberg P F, Valentin A, Engström B, Németh G
School of Human Kinetics, University of Ottawa, Ottawa, Canada.
Clin Biomech (Bristol). 2001 Jan;16(1):61-70. doi: 10.1016/s0268-0033(00)00065-6.
To describe three-dimensional tibial and femoral movements in vivo and examine the effect of a brace on knee kinematics during moderate to intense activity.
Skeletal kinematics of anterior cruciate ligament deficient knees was measured with and without braces during moderate to intense activity.
Invasive markers implanted into the tibia and femur are the most accurate means to directly measure skeletal motion and may provide a more sensitive measure of the differences between brace conditions.
Steinmann traction pins were implanted into the femur and tibia of four subjects having a partial or complete anterior cruciate ligament rupture. Non-braced and braced conditions were randomly assigned and subjects jumped for maximal horizontal distance to sufficiently stress the anterior cruciate ligament.
Intra-subject peak vertical force and posterior shear force were generally consistent between conditions. Intra-subject kinematics was repeatable but linear displacements between brace conditions were small. Differences in angular and linear skeletal motion were observed across subjects. Bracing the anterior cruciate ligament deficient knee resulted in only minor kinematic changes in tibiofemoral joint motion.
In this study, no consistent reductions in anterior tibial translations were observed as a function of the knee brace tested. Relevance. Investigations have reported that knee braces fail when high loads are encountered or when load is applied in an unpredictable manner. Questions remain regarding tibiofemoral joint motion, in particular linear displacements. The pin technique is a means for direct skeletal measurement and may provide a more sensitive measure of the differences between brace conditions.
描述体内胫骨和股骨的三维运动，并研究在中度至剧烈活动期间支具对膝关节运动学的影响。
在中度至剧烈活动期间，对前交叉韧带缺失的膝关节在佩戴和不佩戴支具的情况下进行骨骼运动学测量。
植入胫骨和股骨的侵入性标记物是直接测量骨骼运动的最准确方法，并且可能为支具条件之间的差异提供更敏感的测量。
将斯氏针植入四名部分或完全前交叉韧带断裂患者的股骨和胫骨。随机分配不佩戴支具和佩戴支具的情况，让受试者进行最大水平距离的跳跃，以充分拉伸前交叉韧带。
不同条件下受试者的垂直峰值力和后剪切力总体上是一致的。受试者内部的运动学是可重复的，但支具条件之间的线性位移很小。不同受试者之间观察到角度和线性骨骼运动的差异。对前交叉韧带缺失的膝关节佩戴支具仅导致胫股关节运动的微小运动学变化。
在本研究中，未观察到测试的膝关节支具能使胫骨前移持续减少。相关性。研究报告称，当遇到高负荷或以不可预测的方式施加负荷时，膝关节支具会失效。关于胫股关节运动，特别是线性位移，仍存在问题。针技术是一种直接进行骨骼测量的方法，可能为支具条件之间的差异提供更敏感的测量。
