Cruciate coupling and screw-home mechanism in passive knee joint during extension-flexion
Cruciate coupling and screw-home mechanism in passive knee joint during extension-flexion
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DOI：
10.1016/j.jbiomech.2004.05.033
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发表时间：
2005-05-01
影响因子：
2.4
通讯作者：
Shirazi-Adl, A
中科院分区：
文献类型：
--
作者：
Moglo, KE;Shirazi-Adl, A
针对各种边界条件、屈曲轴对齐和后十字韧带 (PCL)/前十字韧带 (ACL) 条件，研究了被动膝关节屈曲期间十字韧带中的螺钉归位机制和力之间的耦合。使用开发的非线性 3D 有限元模型对人体胫股关节进行详细的弹静力响应分析，分析其作为从 10 度超伸到 90 度屈曲的屈曲角度的函数。当股骨弯曲时，胫骨向内旋转；当股骨伸展时，胫骨向外旋转。通过围绕轴向（远端-近端）轴旋转 +/-5 度来重新对准屈曲轴、ACL 的横断以及十字韧带初始应变的变化极大地影响了“螺钉复位”运动。另一方面，对这种耦合旋转的限制减少了屈曲时的 ACL 力。预测屈曲时 ACL 和 PCL 力之间存在显着的耦合；当其中一个十字韧带的初始应变或预张力增加时，两个十字韧带中的力都会增加，而当其中一个十字韧带被切断或松弛时，它们都会减小。这对韧带损伤或置换手术后的关节功能生物力学具有重要影响，因此对关节疾病的正确治疗也有重要影响。 (c) 2004 Elsevier Ltd. 保留所有权利。
The screw-home mechanism and coupling between forces in cruciate ligaments during passive knee joint flexion were investigated for various boundary conditions, flexion axis alignments and posterior cruciate ligaments (PCL)/anterior cruciate ligament (ACL) conditions. A developed non-linear 3D finite element model was used to perform detailed elasto-static response analyses of the human tibiofemoral joint as a function of flexion angle varying from 10 degrees hyper-extension to 90 degrees flexion. The tibia rotated internally as the femur flexed and externally as the femur extended. The re-alignment of the flexion axis by +/- 5 degrees rotation about the axial (distal-proximal) axis, transection of the ACL and changes in cruciate ligament initial strains substantially influenced the 'screw-home' motion. On the other hand, restraint on this coupled rotation diminished ACL forces in flexion. A remarkable coupling was predicted between ACL and PCL forces in flexion; forces in both cruciate ligaments increased as the initial strain or pretension in one of them increased whereas they both diminished as one of them was cut or became slack. This has important consequences in joint functional biomechanics following a ligament injury or replacement surgery and, hence, in the proper management of joint disorders. (c) 2004 Elsevier Ltd. All rights reserved.