Effects of Restressing on the Mechanical Properties of Stress-Shielded Patellar Tendons in Rabbits

[+] Author and Article Information
Noritaka Yamamoto, Kozaburo Hayashi

Department of Mechanical Engineering, Osaka University, Toyonaka, Osaka 560, Japan

Hiroyuki Kuriyama

Design Center, Hitachi, Ltd., Tokyo 107, Japan

Kazunori Ohno, Kazunori Yasuda, Kiyoshi Kaneda

Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo 060, Japan

J Biomech Eng 118(2), 216-220 (May 01, 1996) (5 pages) doi:10.1115/1.2795962 History: Received October 28, 1993; Revised March 28, 1995; Online October 30, 2007


We studied the effects of restressing on the mechanical properties and morphology of stress-shielded rabbit patellar tendons. After completely unloading the patellar tendon for 1 to 3 weeks, tension was again applied to the tendon for the subsequent 3 to 12 weeks. Although the stress shielding markedly decreased the tangent modulus and tensile strength of the tendon, restressing significantly increased them. However, the mechanical properties of the tendon were not completely recovered even after a prolonged period of restressing. The microstructure of the tendon was also restored by although the recovery was incomplete. These results indicate that the mechanical properties and morphology of tendinous tissue change in response to mechanical demands.

Copyright © 1996 by The American Society of Mechanical Engineers
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