Background

This research aimed to study the biomechanical properties of sheep tendon under torsion and the tendon energy absorption performance with an externally imposed initial force.

Methods

Tendons of nine healthy knees of sheep were investigated. In both tests, we investigated energy and relaxation at rotations of 0°, 90°, 180°, and 360°. For both tensile force and tensile displacement at a sampling period of 100 milliseconds, the maximum value of 89 N was selected as the maximum tension state for 600 s of relaxation duration for testing relaxation, and analysed of the average force of the last 30 s.

Findings

The difference of energy levels of the tendons are significant between twisted groups (180° and 360°) and untwisted group (0°) (P < 0.05); The relaxation force decreases significantly with twisted groups (90°,180°, and 360°) and untwists group (0°) (P < 0.05). The nine-group tendons show no significant difference at torsion 90° and 180° (P = 0.466). Peak force test shows significant differences between the twisted groups (90°,180°, and 360°) and untwisted group (0°) (P < 0.05).

Interpretation

The torsion tendon has lower energy absorption and relaxation than the untwisted counterparts; thus, it may be more prone to damage. These results are useful for providing guidance on anterior cruciate ligament reconstruction.

中文翻译：

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膝关节前交叉韧带生物力学在能量和松弛方面的研究。

背景

这项研究旨在研究绵羊肌腱在扭转作用下的生物力学特性以及在外部施加初始力的情况下的肌腱能量吸收性能。

方法

研究了九个健康的绵羊膝盖的肌腱。在这两个测试中，我们研究了0°，90°，180°和360°旋转时的能量和弛豫。对于在100毫秒的采样周期内的拉伸力和拉伸位移，选择89 N的最大值作为600 s松弛时间的最大拉伸状态，以测试松弛，并分析最近30 s的平均力。

发现

扭曲组（180°和360°）和未扭曲组（0°）之间的腱能级差异显着（P  <0.05）；扭曲组（90°，180°和360°）和未扭曲组（0°）的松弛力显着降低（P  <0.05）。九组肌腱在90°和180°扭转时无明显差异（P  = 0.466）。峰值力测试显示了扭曲组（90°，180°和360°）和未扭曲组（0°）之间的显着差异（P  <0.05）。

解释

扭转肌腱的能量吸收和放松程度低于未扭转肌腱。因此，它可能更容易受到损坏。这些结果可为前十字韧带重建提供指导。