Effects of simulated injury on the anteroinferior glenohumeral capsule.
Effects of simulated injury on the anteroinferior glenohumeral capsule.
复制标题
模拟损伤对盂肱关节前下囊的影响。
DOI：
10.1007/s11517-012-0961-1
复制
发表时间：
2012
影响因子：
3.2
通讯作者：
Debski,RichardE
中科院分区：
文献类型：
--
作者：
Rainis,CarrieA;Brown,AndrewJ;McMahon,PatrickJ;Debski,RichardE
盂肱关节脱位导致盂肱关节囊永久变形（不可恢复的应变），导致活动度增加和复发性不稳定。很少有研究检查了损伤对关节囊生物力学性能的影响，这可能导致修复手术后患者结局不佳。本研究的目的是确定拉伸变形过程中模拟损伤对AB-IGHL刚度和材料性能的影响。采用实验和计算相结合的方法，六AB-IGHL样品在拉伸伸长过程中的刚度和材料性能进行了测定之前和之后的模拟损伤。AB-IGHL承受12.7 ± 3.2%的最大主应变，导致2.5 ± 0.9%的不可恢复应变。正常组（52.4 ± 30.0 N/mm，39.1 ± 26.6 MPa）与损伤组（64.7 ± 21.3 N/mm，73.5 ± 53.8 MPa）应力-拉伸曲线的线性区刚度和模量显著增加（p= 0.03，p = 0.04）。这些增加表明在模拟损伤后存在组织微观结构的变化。受伤的组织可能含有更多排列的胶原纤维，可能无法支持正常的关节活动范围。在模拟损伤过程中的胶原纤维运动学将在未来进行研究。
Glenohumeral dislocation results in permanent deformation (nonrecoverable strain) of the glenohumeral capsule which leads to increased range of motion and recurrent instability. Minimal research has examined the effects of injury on the biomechanical properties of the capsule which may contribute to poor patient outcome following repair procedures. The objective of this study was to determine the effect of simulated injury on the stiffness and material properties of the AB-IGHL during tensile deformation. Using a combined experimental and computational methodology, the stiffness and material properties of six AB-IGHL samples during tensile elongation were determined before and after simulated injury. The AB-IGHL was subjected to 12.7 ± 3.2 % maximum principal strain which resulted in 2.5 ± 0.9 % nonrecoverable strain. The linear region stiffness and modulus of stress–stretch curves between the normal (52.4 ± 30.0 N/mm, 39.1 ± 26.6 MPa) and injured (64.7 ± 21.3 N/mm, 73.5 ± 53.8 MPa) AB-IGHL increased significantly (p= 0.03,p= 0.04). These increases suggest that changes in the tissue microstructure exist following simulated injury. The injured tissue could contain more aligned collagen fibers and may not be able to support a normal range of joint motion. Collagen fiber kinematics during simulated injury will be examined in the future.