In situ strain and stress of nerve conduction blocking in the brachial plexus

Journal of Orthopaedic Research - Tập 20 - Trang 1311-1314 - 2002
Shinro Takai1, Hidefumi Dohno1, Yoshinobu Watanabe1, Nobuyuki Yoshino1, Taku Ogura1, Yasusuke Hirasawa1
1Department of Orthopaedic Surgery, Kyoto Prefectural University of Medicine, 465 Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan

Tóm tắt

AbstractThe objective of the present study was to determine the in situ strain and stress of nerve conduction blocking in the brachial plexus. The measurement of the in situ tension stress inducing functional failure of the brachial plexus consisted of two steps. Step I (in vivo): The brachial plexus of the rabbit was stretched laterally until electrophysiological conduction blocking occurred. The distance between two dye marks placed on the lower trunk was simultaneously recorded using a video dimensional analyzer system. Step II (in vitro): The lower trunk that was removed was loaded again, and the nerve tension was recorded. The load at complete conduction blocking was determined by a load‐elongation curve. The results showed that when the in situ nerve strain reached 8.1 ± 0.5%, the compound muscle action potential was not evoked. The in situ load and stress were 2.5 ± 0.4 N and 0.89 ± 0.14 MPa, respectively, at complete conduction blocking. These findings should be helpful in understanding the mechanism of brachial plexus traction injury.© 2002 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.

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Journal of Orthopaedic Research

Tập 20

1311-1314

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