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Analyzing the anterior knee laxity during passive flexion
Published in Newswood Limited
2015
Volume: 2218
   
Pages: 1034 - 1037
Abstract
Anterior-posterior knee laxity in the sagittal plane indicates the functional state of cruciate ligaments. Particularly, the anterior cruciate ligament or ACL is damaged frequently during strenuous activities like in sports. Following injury and treatment, not only a significant percentage of patients are not able to return to their pre-injury level activity, but also they continue to have knee related complications in medium to long term period. Therefore, there is a need for better understanding of the knee. In the present study, anterior laxity of the knee that is related to the function of the ACL, is analyzed during passive flexion of the joint. The knee was modelled in the sagittal plane using anatomical data and material properties to represent the joint structures mathematically and simulate the joint motion during 0-120° flexion while no muscle force or external load was applied. The ACL was represented as bundles of nonlinear elastic fibers. A laxity test with 130N anteriorly directed external force on the tibia was simulated at several flexion angles. The results from model calculations showed agreement with experimental observations from literature. 130N anterior force translated the tibia anterior to the femur non-Iinearly throughout the flexion range. Due to the applied force, fibers of the ACL slackened or stretched differently depending on their location of insertion as well as on flexion angle. For example, the most anterior fiber stretched at all flexion positions while the most posterior fiber stretched at low or high flexion. Anterior bundle of the ACL contributed significantly in resisting the external force while the posterior bundle contributed mainly near extension or in high flexion. The analysis has relevance to ACL-reconstruction and ACL rehabilitation.
About the journal
JournalProceedings of the World Congress on Engineering
PublisherNewswood Limited
ISSN20780958
Open AccessNo