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Quantification of the Relative Contribution of Individual Soft Tissue Structures to Total Joint Constraint
Cyr, Adam Joseph
Cyr, Adam Joseph
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Abstract
The constraint of the knee to externally applied loads is due in part to the constraint provided by the soft-tissue structures of the knee. Quantifying the roles soft-tissue structures is important for developing accurate joint model kinematic predictions, evaluating long-term success of total knee arthroplasty, and diagnosing soft-tissue injury. However, the inter-relationship that exists between ligaments to produce a net constraint is not well understood. The over-arching objective of the presented research was to quantify the relative contribution of individual soft-tissue structures to the total constraint of the knee. To accomplish this a new analysis was developed that accounts for multiple degrees of freedom simultaneously, thereby producing a single unified envelope of constraint for an individual specimen over discrete loads that accounts for the inter-related degrees of freedom of joint constraint. With a data set of 28 cadaveric knees, a statistical representation of the major modes of variation among the specimens was also calculated, creating a novel approach to quantifying variation in joint laxity among different population subsets. Experimentally collected ligament recruitment data were then directly measured from individual soft-tissue structures in a series of cadaveric experiments. Utilizing the unified envelope of constraint, this data were used to quantify the contribution from the collateral ligaments to total joint constraint. With data from nine specimens (eight MCL and six LCL instrumented), a statistical mapping of collateral contribution under compound loading conditions was developed. Finally, a computational model of a single specimen was used to develop a technique for validating simulated ligaments. The unified envelope of constraint was used to tune collateral ligament parameters in the model, which resulted in an average error of 0.9 degrees and 3.0 degrees for varus-valgus and internal-external rotations, respectively. The following chapters provide background information to the project, detail the work performed, and discuss future directions and applications.
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Date
2014-01-01
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University of Kansas
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This item contains archived web content.
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Cyr_ku_0099D_13336_DATA_1.pdf
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Keywords
Biomechanics, Engineering, Kinematics, Knee, Ligaments, Passive constraints