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TECHNICAL PAPERS

A Modeling Study of Partial ACL Injury: Simulated KT-2000 Arthrometer Tests

[+] Author and Article Information
Wen Liu

Department of Physical Therapy and Rehabilitation Science, The University of Kansas Medical Center, Kansas City, Kansas 66160-7601

Murray E. Maitland, G. Douglas Bell

Sport Medicine Center, Faculty of Kinesiology, The University of Calgary, Calgary, Canada

J Biomech Eng 124(3), 294-301 (May 21, 2002) (8 pages) doi:10.1115/1.1468636 History: Received March 01, 1999; Revised December 01, 2001; Online May 21, 2002
Copyright © 2002 by ASME
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Figures

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Schematic of an anatomical knee model in an simulated Lachman’s test using the KT-2000 arthrometer
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(a) Simulated force-displacement curve was compared to a typical curve obtained from clinical measurement (Maitland et al. 27). (b) Simulated anterior force on the ligaments of the normal knee. The force on the LCL was zero throughout the test.
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Force-displacement curves obtained from simulated Lachman’s test for the normal and ACL-deficient knees with comparison to the knees with (a) the first type (anterior bundle dominant), and (b) the second type (posterior bundle dominant) of the partial ACL injuries
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Force versus α−1/α2 curves obtained from simulated Lachman’s test for the normal and ACL-deficient knees with comparison to the knees with (a) the first type (anterior bundle dominant), and (b) the second type (posterior bundle dominant) of the partial ACL injuries
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For the first type (anterior bundle dominant) of partial ACL injuries, (a) curve fit (solid line) of the force-displacement data, (b) the stiffness calculated from the fitted curves, and (c) the rate of change of stiffness
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For the second type (posterior bundle dominant) of partial ACL injuries, (a) curve fit of the force-displacement data, (b) the stiffness calculated from the fitted curves, and (c) the rate of change of stiffness
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(a) Schematic of ligamentous force-strain characteristics used in this study. A quadratic function before 2ε1 and a linear function after 2ε1 were used to represent the force-strain property of the ligament. (b) The stiffness in the injury of ACLa4 calculated from fitted curve is compared to the same stiffness calculated from simulated original data. The point c corresponds to a dramatic change in the stiffness.

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