The Relationship Between Loading Conditions and Fracture Patterns of the Proximal Femur

[+] Author and Article Information
K. H. Yang, K.-L. Shen, C. K. Demetropoulos, A. I. King

Bioengineering Center, Wayne State University, Detroit, MI 48201

P. Kolodziej, R. S. Levine, R. H. Fitzgerald

Department of Orthopaedic Surgery, Wayne State University, Detroit, MI 48201

J Biomech Eng 118(4), 575-578 (Nov 01, 1996) (4 pages) doi:10.1115/1.2796045 History: Received March 30, 1994; Revised September 23, 1995; Online October 30, 2007


In an attempt to test the hypothesis of spontaneous hip fracture, seven pairs of femurs, with ages ranging from 59 to 90, were tested under two loading conditions designed to simulate muscular contraction. Simulated iliopsoas contraction produced femoral neck fractures at an average normalized ultimate load of 5.2 ± 0.8 times body weight. Simulated gluteus medius contraction produced sub-/inter-trochanteric fractures at an average normalized ultimate load of 4.1 ± 0.6 times body weight. The average ultimate load for all specimens was 3040 ± 720 N. Fracture patterns produced by both loading conditions were clinically relevant. The results from this study suggest that abnormal contraction produced by major rotator muscles could induce hip fracture.

Copyright © 1996 by The American Society of Mechanical Engineers
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