ANTERIOR CRUCIATE LIGAMENT STRAIN BEHAVIOR DURING REHABILITATION EXERCISES IN-VIVO
ANTERIOR CRUCIATE LIGAMENT STRAIN BEHAVIOR DURING REHABILITATION EXERCISES IN-VIVO
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DOI：
10.1177/036354659502300105
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发表时间：
1995-01-01
影响因子：
4.8
通讯作者：
POPE, MH
中科院分区：
文献类型：
--
作者：
BEYNNON, BD;FLEMING, BC;POPE, MH
在研究康复训练对重建膝关节的生物力学影响之前，了解其对正常前交叉韧带的影响是很重要的。这项研究的目的是测量该韧带在活体康复活动中的应变行为。受试者是前十字韧带正常的患者志愿者，用霍尔效应换能器进行器械治疗。在屈曲10度和20度时，受试者小腿承受45N重量的主动伸膝时的韧带应变值显著大于没有该重量的主动活动。股四头肌在15度和30度等长收缩时，韧带张力也显著增加，而在膝关节屈曲60度和90度时，韧带张力与放松肌肉状态相比没有变化。与放松状态相比，股四头肌和腿筋肌肉同时收缩15度时，韧带张力显著增加，但在屈曲30度、60度和90度时，韧带没有应变。在任何屈曲角度下，腿筋肌的等长收缩不会引起韧带应变的变化。产生较低或无张力的韧带数值，并且不会危及适当植入的移植物的运动，要么以腿筋肌肉(等长腿筋)为主，要么涉及膝关节屈曲60度或更大的股四头肌肌肉活动(等长股四头肌、同时的股四头肌和腿筋收缩)，或者涉及膝关节在35度至90度屈曲之间的主动运动。
Before studying the biomechanical effects of rehabilitation exercises on the reconstructed knee, it is important to understand their effects on the normal anterior cruciate ligament. The objective of this investigation was to measure the strain behavior of this ligament during rehabilitation activities in vivo. Participants were patient volunteers with normal anterior cruciate ligaments instrumented with the Hall effect transducer. At 10 degrees and 20 degrees of flexion, ligament strain values for active extension of the knee with a weight of 45 N applied to a subject's lower leg were significantly greater than active motion without the weight. Isometric quadriceps muscle contraction at 15 degrees and 30 degrees also produced a significant increase in ligament strain, while at 60 degrees and 90 degrees of knee flexion there was no change in ligament strain relative to relaxed muscle condition. Simultaneous quadriceps and hamstrings muscles contraction at 15 degrees produced a significant increase in ligament strain compared with the relaxed state but did not strain the ligament at 30 degrees, 60 degrees, and 90 degrees of flexion. Isometric contraction of hamstrings muscles did not produce change in ligament strain at any flexion angle. Exercises that produce low or unstrained ligament values, and would not endanger a properly implanted graft, are either dominated by the hamstrings muscle (isometric hamstring), involve quadriceps muscle activity with the knee flexed at 60 degrees or greater (isometric quadriceps, simultaneous quadriceps and hamstrings contraction), or involve active knee motion between 35 degrees and 90 degrees of flexion.