Computational knee ligament modeling using experimentally determined zero-load lengths.
Computational knee ligament modeling using experimentally determined zero-load lengths.
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DOI：
10.2174/1874230001206010033
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Dodd K
中科院分区：
文献类型：
--
作者：
Bloemker KH;Guess TM;Maletsky L;Dodd K
本研究提出了一种确定计算膝关节模型中十字韧带和副韧带零负荷长度的特定方法。在动态膝关节模拟器中对三具尸体的膝关节进行了测试。为了确定每个韧带束的零负荷长度，还对尸体膝关节进行了手动运动包膜测试，以确定其被动运动范围。为每个膝关节建立了计算多体膝关节模型，并将模型运动学与模拟步行周期的实验运动学进行了比较。在膝关节模型中，采用一维非线性弹簧阻尼器单元来表示交叉韧带束和副韧带束。本研究发现，膝关节运动学对零载荷长度的改变高度敏感。结果还提出了最佳的方法来定义每个韧带束零负荷长度，无论主题。这些结果验证了零载荷长度在膝关节建模时的重要性，并验证了手动运动测量包络可用于确定膝关节的被动运动范围。我们还相信，这里描述的用于确定零负荷长度的方法可用于体外或体内特定于受试者的计算模型。
This study presents a subject-specific method of determining the zero-load lengths of the cruciate and collateral ligaments in computational knee modeling. Three cadaver knees were tested in a dynamic knee simulator. The cadaver knees also underwent manual envelope of motion testing to find their passive range of motion in order to determine the zero-load lengths for each ligament bundle. Computational multibody knee models were created for each knee and model kinematics were compared to experimental kinematics for a simulated walk cycle. One-dimensional non-linear spring damper elements were used to represent cruciate and collateral ligament bundles in the knee models. This study found that knee kinematics were highly sensitive to altering of the zero-load length. The results also suggest optimal methods for defining each of the ligament bundle zero-load lengths, regardless of the subject. These results verify the importance of the zero-load length when modeling the knee joint and verify that manual envelope of motion measurements can be used to determine the passive range of motion of the knee joint. It is also believed that the method described here for determining zero-load length can be used for in vitro or in vivo subject-specific computational models.