Anterior cruciate ligament strain in-vivo: A review of previous work
Anterior cruciate ligament strain in-vivo: A review of previous work
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DOI：
10.1016/s0021-9290(98)00044-x
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发表时间：
1998-06-01
影响因子：
2.4
通讯作者：
Fleming, BC
中科院分区：
文献类型：
--
作者：
Beynnon, BD;Fleming, BC
前十字韧带（ACL）是膝关节的主要稳定器，如果其断裂，可能会导致残疾。我们工作的目的是在正常肌肉功能和体重的情况下研究人类的正常 ACL，制定重建的临床标准，为康复计划奠定基础，并评估护膝如何保护这一重要韧带。当受试者在局部麻醉下时，通过关节镜植入差动可变磁阻传感器来测量 ACL 的应变行为。膝盖从弯曲位置移动到伸展位置（无论是被动地还是通过腿部肌肉的收缩）都会导致 ACL 应变值增加。膝关节在 50 度和伸展之间时，主导股四头肌的孤立收缩会导致应变大幅增加。相反，在任何膝盖位置单独收缩腘绳肌都不会增加应变。当膝盖未负重时，功能性护膝的保护性应变屏蔽效果随着施加到胫骨的前剪切载荷的大小的增加而降低。在负重过程中会出现不同的行为，随着前部负载大小的增加，支架的应变屏蔽效应保持恒定。我们的方法是新颖的，因为它可以用来测量 ACL 应变分布的重要部分，同时对膝盖施加临床相关负载，受试者进行康复锻炼，或在存在不同矫形器（例如功能性护膝）的情况下。 (C) 1998 Elsevier Science Ltd. 保留所有权利。
Disruption of the anterior cruciate ligament (ACL), a primary stabilizer of the knee, can produce disability. The purpose of our work has been to study the normal ACL in humans, in the presence of normal muscle function and body weight, and develop clinical criteria for reconstruction, establish a basis for rehabilitation programs, and evaluate how knee braces protect this important ligament. The strain behavior of the ACL has been measured by arthroscopic implantation of the Differential Variable Reluctance Transducer while subjects are under local anesthesia. Movement of the knee from a flexed to an extended position, either passively or through contraction of the leg muscles, produces an increase in ACL strain values. Isolated contraction of the dominant quadriceps with the knee between 50 degrees and extension creates substantial increases in strain. In contrast, isolated contraction of the hamstrings at any knee position does not increase strain. With the knee un-weighted, the protective strain shielding effect of a functional knee brace decreases as the magnitude of anterior shear load applied to the tibia increases. A different behavior occurs during weight bearing, the strain shielding effect of the brace remains constant as the magnitude of anterior load increases. Our approach is novel in that it can be used to measure on important portion of the ACLs strain distribution while clinically relevant loads are applied to the knee, subjects perform rehabilitation exercises, or in the presence of different orthoses such as functional knee braces. (C) 1998 Elsevier Science Ltd. All rights reserved.