Stress and strain in the anterior band of the inferior glenohumeral ligament during a simulated clinical examination
Stress and strain in the anterior band of the inferior glenohumeral ligament during a simulated clinical examination
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DOI：
10.1016/j.jse.2004.10.003
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发表时间：
2005-01-01
影响因子：
3
通讯作者：
McMahon, PJ
中科院分区：
文献类型：
--
作者：
Debski, RE;Weiss, JA;McMahon, PJ
本研究的目的是通过有限元模型预测在肱骨外展时施加前部载荷期间盂肱韧带前带 (AB-IGHL) 的应力和应变场。 AB-IGHL 中的应力和应变是在单个完整肩部的模拟简单平移测试中确定的。使用六自由度磁跟踪系统来测量肱骨相对于肩胛骨的运动学。临床医生对肱骨施加前向负载，直至盂肱外展 60 度、屈曲/伸展和外旋 0 度时达到手动最大负荷。对于计算分析，实验测量的关节运动学用于规定肱骨相对于肩胛骨的运动，而 AB-IGHL 的材料属性基于已发表的实验数据。AB-IGHL、肱骨和肩胛骨的几何形状是通过使用体积计算机断层扫描获得的，用于定义 AB-IGHL 的参考配置。沿下缘应变达到 12%，在最大前平移位置的肩胛插入点附近应变达到 15%。在此运动过程中，AB-IGHL 缠绕在肱骨上，并通过接触将负载转移到骨骼上。韧带中 von Mises 应力的预测值在与肱骨头接触点处达到 4.3 MPa，在肩胛骨插入点附近达到 6.4 MPa。将这些结果与文献进行比较表明，当使用具有超龄材料特性的样本特定几何形状和运动学时，计算方法可以合理预测 AB-IGHL 中的纤维应变。整个 AB-IGHL 中复杂的应力和应变分布表明，在生物力学分析中应考虑盂肱关节囊的连续性。未来，这种实验和计算相结合的方法将用于针对特定主题的囊功能研究，并可以提供定量数据来帮助外科医生改进盂肱不稳定性的诊断和治疗方法。
The objective of this research was to predict, with a finite-element model, the stress and strain fields in the anterior band of the inferior glenohumeral ligament (AB-IGHL) during application of an anterior load with the humerus abducted. The stress and strain in the AB-IGHL were determined during a simulated simple translation test of a single intact shoulder. A 6-degree-of-freedom magnetic tracking system was used to measure the kinematics of the humerus with respect to the scapula. A clinician applied an anterior load to the humerus until a manual maximum was achieved at 60degrees of glenohumeral abduction and 0degrees of flexion/extension and external rotation. For the computational analysis, the experimentally measured joint kinematics were used to prescribe the motion of the humerus with respect to the scapula, whereas the material properties of the AB-IGHL were based on published experimental data, The geometry of the AB-IGHL, humerus, and scapula was acquired by use of a volumetric computed tomography scan, which was used to define the reference configuration of the AB-IGHL. Strains reached 12% along the inferior edge and 15% near the scapular insertion site at the position of maximum anterior translation. During this motion, the AB-IGHL wrapped around the humerus and transferred load to the bone via contact. Predicted values for von Mises stress in the ligament reached 4.3 MPa at the point of contact with the humeral head and 6.4 MPa near the scapular insertion site. A comparison of these results to the literature suggests that the computational approach provided reasonable predictions of fiber strain in the AB-IGHL when specimen-specific geometry and kinematics with overage material properties were used. The complex stress and strain distribution throughout the AB-IGHL suggests that the continuous nature of the glenohumeral capsule should be considered in biomechanical analyses. In the future, this combined experimental and computational approach will be used for subject-specific studies of capsular function and could provide quantitative data to help surgeons improve methods for the diagnosis and treatment of glenohumeral instability.