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TECHNICAL PAPERS

In Vivo Observations of Hydraulic Stiffening in the Canine Femoral Head

[+] Author and Article Information
J. A. Ochoa, A. P. Sanders

Johnson & Johnson Professional, 325 Paramount Dr., Raynham, MA 02767

T. W. Kiesler, D. A. Heck

Department of Orthopaedic Surgery, Indiana University School of Medicine, 541 Clinical Dr., Indianapolis, IN 46202-5111

J. P. Toombs

Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, W. Lafayette, IN 47907-7403

K. D. Brandt

Rheumatology Division, Indiana University School of Medicine, 541 Clinical Dr., Indianapolis, IN 46202-5103

B. M. Hillberry

School of Mechanical Engineering, Purdue University, W. Lafayette, IN 47907-1288

J Biomech Eng 119(1), 103-108 (Feb 01, 1997) (6 pages) doi:10.1115/1.2796051 History: Received April 28, 1993; Revised March 27, 1996; Online October 30, 2007

Abstract

The role that intertrabecular contents and their boundary conditions have on the dynamic mechanical response of canine femoral heads was investigated in vivo. Femoral heads from paired intact hind limbs of canine specimens were subjected to a sinusoidal strain excitation, at physiologic frequencies, in the cranio-caudal direction. The fluid boundary conditions for the contralateral limbs were changed by predrilling through the lateral femoral cortex and into the femoral neck. The drilling procedure did not invade the head itself. This femoral head fluid boundary alteration reduced the stiffness by 19 percent for testing at 1 Hz. The results of this study demonstrate that fluid stiffening occurs in vivo as previously observed ex vivo.

Copyright © 1997 by The American Society of Mechanical Engineers
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