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The Effect of Sectioning the Posterolateral Corner on the Biomechanics of the Posterior Cruciate Ligament: A Finite Element Analysis with Validation

Author: WuChangJun
Tutor: KongKangMei
School: Shantou University
Course: Orthopedics
Keywords: Posterolateral corner The posterior cruciate ligament Finite element model Biomechanics Stress distribution
CLC: R687.3
Type: Master's thesis
Year: 2010
Downloads: 50
Quote: 0
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Background posterolateral corner knee foreign important stabilizing structure, studies have shown that the posterolateral corner in maintaining knee rotation, varus, and have an important role to stability in the proximal tibia. Although the posterolateral corner injury alone the proportion of only 2% in the knee ligament injury, posterolateral corner injury normally associated injuries, studies have shown that 60% of the posterior cruciate ligament injury accompanied by posterolateral corner injury. If you ignore the diagnosis and repair of composite injury can also lead cruciate ligament reconstruction surgery failed. In recent years, many scholars on the biomechanics of the posterolateral corner of the knee launched an in-depth study, but through cadaveric study, cadaveric study during posterior cruciate ligament injury or reconstruction parameter study has its limitations. Proven finite element model can be obtained the many corpses Institute difficult to obtain data, and these data will help us better understand the the cross ligament reconstruction failure mechanism and help us to develop a more rational surgery after the occurrence of the above combined injury programs. Access to domestic and foreign literature, has yet to see the outer corner of the structure contains the finite element model of the knee and the posterolateral corner injury of the posterior cruciate ligament stress reports, the purpose of this experiment is to study the establishment has a high biological fidelity and contains real outside feasibility of the finite element model of the knee angle geometry, the effectiveness of the model is verified by the experimental study comparison of the data with the relevant bodies of and shift load applied to the model 134N, - 5N.m at external rotation and varus load calculation knee in a neutral bit 0 °, flexion 30 °, 60 ° and 90 ° degrees posterior cruciate ligament is exposed to stress and distribution. Purpose, establish good biological fidelity contains real geometry of posterolateral corner knee finite element model and experimental data verify the effectiveness of the model. 2, the use of Verified knee have better biological fidelity finite element model of the outside corners complete injury on the posterior cruciate ligament stress, calculate the posterolateral corner injury before and after posterior cruciate ligament is exposed to stress and its distribution. Materials and methods healthy adult volunteers (male, 25 years old) left knee CT and MRI scans, CT and MRI data import Mimics10.0 software, and on this basis to establish a geometric model of the knee joint. IGES file import geometric data pre-processing finite element software Hypermesh, and the division of the finite element mesh. Material properties, loads, boundary conditions, such as defined in the related carcasses on an experimental basis, and ls-dyna software knee in the neutral position 0 ° flexion to 30 ° to 60 ° and 90 °, when the kinematic changes. Verify the effectiveness of the model, the model calculated the posterior cruciate ligament in the outer corner complete injury before and after the stress distribution. Results successfully established the posterolateral corner has a three-dimensional nonlinear finite element model of the structure of the entire model by 4,278 units, 4,193 nodes, the model output with dead bodies in a variety of settings working conditions under the experimental data comparability. 2 completely cut off the outside corners of the tibia impose 134N shift force, have increased in all knee flexion posterior cruciate ligament is exposed to stress, the most significant increase in the neutral position of 0 °, an increase of 24.9MPa; stress no significant change in the site of the most concentrated distribution than the cut. Cut outer corner 5Nm external rotation torque load, the posterior cruciate ligament is exposed to stress have increased in the neutral position 0 ° and 60 ° flexion, the biggest increase in 30 ° of flexion, an increase of 22.6MPa, knees 90 ° decreased; the cross ligament stress distribution in the most concentrated area flexion 30 ° and 90 ° when a significant change, are located in the substance of the Ministry. Cut outer corner, imposed on the tibial torque 5Nm varus, posterior cruciate ligament withstand stress were significantly increased in all knee flexion, the largest increase in the neutral position at 0 °, an increase of 22.2MPa; posterior cruciate ligament stress the most concentrated distribution site in the neutral position 0 ° and 30 °, respectively located in the femoral insertion near the femur, tibia ended near and real part. The conclusion of the study we have successfully established contains the posterolateral corner of the knee finite element model, and verify its effectiveness can be further used for biomechanical analysis. Cut outer corner, in the post-shift, external rotation, varus posterior cruciate ligament to withstand the stress load close to the knee extension increased markedly. The type of load and knees, the integrity of the posterolateral corner of factors will affect the stress distribution on the cross ligament and posterolateral corner injury will increase the chance of cruciate ligament injury.

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CLC: > Medicine, health > Surgery > Orthopaedic Surgery ( movement system diseases,orthopedic surgery ) > Orthopedic surgery and surgery > Bone surgery
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