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TECHNICAL PAPERS

Impact-Induced Fissuring of Articular Cartilage: An Investigation of Failure Criteria

[+] Author and Article Information
T. S. Atkinson, N. J. Altiero

Department of Materials Science and Mechanics, College of Engineering, Michigan State University, East Lansing, MI 48824

R. C. Haut

Orthopaedic Biomechanics Laboratories, College of Osteopathic Medicine, Michigan State University, East Lansing, MI 48824

J Biomech Eng 120(2), 181-187 (Apr 01, 1998) (7 pages) doi:10.1115/1.2798300 History: Received August 07, 1996; Revised April 30, 1997; Online October 30, 2007

Abstract

Several candidate predictors for the occurrence of surface fissures in cartilage, including impact force, shear stress, and tensile strain have been previously proposed without an analytic basis. In this study a controlled impact experiment was performed where a dropped mass and three impact interfaces were used to identify loads associated with the initiation of fissuring. A Finite Element Model of each experiment was used to obtain stresses and strains associated with each impact event. The resulting experimental and analytical data were analyzed using logistic regression in order to determine the strongest predictor of a fissure, and thus to propose a failure criterion for articular cartilage during a blunt insult. The logistic regression indicated that shear stress, rather than impact force or drop height (an indicator of impact energy), was the strongest predictor for the occurrence of a fissure.

Copyright © 1998 by The American Society of Mechanical Engineers
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