Measurement of changes in ligament tension with knee motion and skeletal maturation.
Measurement of changes in ligament tension with knee motion and skeletal maturation.
复制标题
测量韧带张力随膝关节运动和骨骼成熟的变化。
DOI：
10.1115/1.2891125
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Hawkins,DA
中科院分区：
文献类型：
--
作者：
Woo,SL;Weiss,JA;Gomez,MA;Hawkins,DA
本研究旨在确定在原位应变，应力和载荷的内侧副韧带（MCL）的未成熟和成熟的家兔。使用非接触的方法，原位应变的大小首先确定为膝关节屈曲角度的函数。MCL沿其宽度分为三个解剖区域（前、中和后）。对于应变测量，在这些区域中的标距长度的变化是在60 °、90 °和120 °屈曲的完整膝关节中获得的。随后，切除膝关节周围的所有软组织，留下股骨-MCL-胫骨（FMT）复合体。允许MCL自由回缩，并测量新长度（称为零长度）。由此，确定了原位菌株。为了获得FMT复合物的应力-应变关系，对试样进行拉伸试验。已知原位应变和应力-应变关系，MCL三个解剖区域的原位应力被确定为膝关节屈曲角的函数。将这些应力乘以1/3的横截面积，并将由此计算的载荷相加，得到MCL的原位载荷。我们的数据表明，在所研究的膝关节屈曲角度范围内，MCL中的原位载荷并不大，即，1.4至2.7 N（对于睾丸未成熟动物）和3.0至5.8 N（对于睾丸成熟动物）。原位负荷随骨骼成熟而增加。
This study was designed to determine the in situ strains, stresses, and loads in the medial collateral ligament (MCL) of skeletally immature and mature rabbits. Using a noncontact method, the magnitudes of the in situ strains were first determined as a function of knee flexion angle. The MCL was divided into three anatomical regions (anterior, middle, and posterior) across its width. For strain measurements, the variation of a gauge length in these regions was obtained in the intact knee at 60, 90, and 120 deg of flexion. Subsequently, all soft tissues around the knee were dissected away, leaving the femur-MCL-tibia (FMT) complex. The MCL was allowed to retract freely and the new length, called the zero length, was measured. From this, the in situ strains were determined. To obtain the stress-strain relationship of the FMT complex, the specimens were subjected to tensile testing. Knowing the in situ strains and the stress-strain relationship, the in situ stresses in the three anatomical regions of the MCL were determined as a function of knee flexion angle. Multiplying these stresses by 1/3 of the cross-sectional area and summing the loads thus calculated, the in situ loads of the MCL were obtained. Our data suggest that the in situ load in the MCL is not large within the range of knee flexion angles studied, i.e., 1.4 to 2.7 N for the skeletally immature animals and 3.0 to 5.8 N for the skeletally mature animals. An increase in the in situ load with skeletal maturation was demonstrated.