In vivo elongation of the anterior cruciate ligament and posterior cruciate ligament during knee flexion
In vivo elongation of the anterior cruciate ligament and posterior cruciate ligament during knee flexion
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DOI：
10.1177/0363546503262175
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发表时间：
2004-09-01
影响因子：
4.8
通讯作者：
Gill, TJ
中科院分区：
文献类型：
--
作者：
Li, G;DeFrate, LE;Gill, TJ
背景：大多数关于十字韧带功能的知识都是基于体外实验。目的：研究前十字韧带和后十字韧带功能束在负重屈曲过程中的体内伸长情况。假设：前十字韧带和后十字韧带功能束在体内负荷下的生物力学作用与尸体中测量的不同。研究设计：体内生物力学研究方法：使用成像和3维计算机建模技术在准静态弓步过程中测量前十字韧带和后十字韧带的伸长率。结果：前十字韧带的前内侧束从完全伸展到90度屈曲具有相对恒定的长度。前交叉韧带的后外侧束的长度随着屈曲而缩短。后交叉韧带的两束都随着屈曲而长度增加。结论：数据并没有证明先前研究中观察到的前交叉韧带或后交叉韧带的两束屈曲的相互功能。相反，数据表明前十字韧带和后十字韧带在屈曲时存在交互作用。前交叉韧带在低屈曲角度中发挥更重要的作用，而后交叉韧带在高屈曲角度中发挥更重要的作用。 临床相关性：了解膝关节韧带在体内的生物力学作用对于重现损伤后韧带的结构行为（特别是对于二束重建）并从而改善手术效果至关重要。
Background: Most knowledge regarding cruciate ligament function is based on in vitro experiments.Purpose: To investigate the in vivo elongation of the functional bundles of the anterior cruciate ligament and posterior cruciate ligament during weightbearing flexion.Hypothesis: The biomechanical role of functional bundles of the anterior cruciate ligament and posterior cruciate ligament under in vivo loading is different from that measured in cadavers.Study Design: In vivo biomechanical studyMethods: Elongation of the anterior cruciate ligament and posterior cruciate ligament was measured during a quasi-static lunge using imaging and 3-dimensional computer-modeling techniques.Results: The anterior-medial bundle of the anterior cruciate ligament had a relatively constant length from full extension to 90degrees of flexion. The posterior-lateral bundle of the anterior cruciate ligament decreased in length with flexion. Both bundles of the posterior cruciate ligament had increased lengths with flexion.Conclusion: The data did not demonstrate the reciprocal function of the 2 bundles of the anterior cruciate ligament or the posterior cruciate ligament with flexion observed in previous studies. Instead, the data suggest that there is a reciprocal function between the anterior cruciate ligament and posterior cruciate ligament with flexion. The anterior cruciate ligament plays a more important role in low-flexion angles, whereas the posterior cruciate ligament plays a more important role in high flexion.Clinical Relevance: Understanding the biomechanical role of the knee ligaments in vivo is essential to reproduce the structural behavior of the ligament after injury (especially for 2-bundle reconstructions) and thus improve surgical outcomes.