Shultz Sandra J, Shimokochi Yohei, Nguyen Anh-Dung, Ambegaonkar Jatin P, Schmitz Randy J, Beynnon Bruce D, Perrin David H
Applied Neuromechanics, Exercise & Sport Science, The University of North Carolina at Greensboro, P.O. Box 26170, 237B HHP Bldg., Greensboro, NC 27402-6170, USA.
J Orthop Res. 2006 Mar;24(3):516-23. doi: 10.1002/jor.20040.
We examined the relationship between anterior knee laxity (AKL), evaluated while the knee was nonweight bearing, and anterior translation of the tibia relative to the femur (ATT), evaluated when the knee transitioned from nonweight-bearing to weight-bearing conditions in response to an applied compressive load at the foot. Twenty subjects with normal knees (10 M, 10 F; 25.2 +/- 4.1 years, 169.8 +/- 11.5 cm, 71.6 +/- 16.9 kg) underwent measurements of AKL and ATT of the right knee on 2 days. AKL was measured at 133N with the KT-2000. ATT was measured with the Vermont Knee Laxity Device and electromagnetic position sensors attached to the patella and the anteromedial aspect of the proximal tibia. Three trials for each measure were averaged and analyzed. Measurement consistency was high for both AKL (ICC = 0.97; SEM = 0.44 mm) and ATT (ICC = 0.88; SEM = 0.84 mm). Linear regression revealed that AKL predicted 35.5% of the variance in ATT (p = 0.006), with a prediction equation of Y(ATT) = 3.20 + 0.543(X(AKL)). Our findings suggest that increased AKL is associated with increased ATT as the knee transitions from nonweight-bearing to weight-bearing conditions. The potential for increased knee joint laxity to disrupt normal knee biomechanics during activities such as landing from a jump, or the foot strike phase of gait deserves further study.
我们研究了在膝关节非负重状态下评估的前交叉韧带松弛度（AKL）与在足部施加压缩负荷时膝关节从非负重状态转变为负重状态时评估的胫骨相对于股骨的前移（ATT）之间的关系。20名膝关节正常的受试者（10名男性，10名女性；年龄25.2±4.1岁，身高169.8±11.5厘米，体重71.6±16.9千克）在两天内接受了右膝AKL和ATT的测量。使用KT-2000在133N力下测量AKL。使用佛蒙特膝关节松弛度测量仪和附着在髌骨及胫骨近端前内侧的电磁位置传感器测量ATT。每种测量进行三次试验并取平均值进行分析。AKL（组内相关系数ICC = 0.97；标准误SEM = 0.44毫米）和ATT（ICC = 0.88；SEM = 0.84毫米）的测量一致性都很高。线性回归显示，AKL可预测ATT中35.5%的变异（p = 0.006），预测方程为Y(ATT) = 3.20 + 0.543(X(AKL))。我们的研究结果表明，随着膝关节从非负重状态转变为负重状态，AKL增加与ATT增加有关。膝关节松弛度增加在诸如从跳跃落地或步态的足跟着地阶段等活动中破坏正常膝关节生物力学的可能性值得进一步研究。
