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    Trauma Biomechanics

    Third Edition

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    ISBN 978-3-642-03712-2 e-ISBN 978-3-642-03713-9DOI 10.1007/978-3-642-03713-9Springer Heidelberg Dordrecht London New York

    Library of Congress Control Number: 2009938113

    c Springer-Verlag Berlin Heidelberg 2010This work is subject to copyright. All rights are reserved, whether the whole or part of the material isconcerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting,reproduction on microfilm or in any other way, and storage in data banks. Duplication of this publicationor parts thereof is permitted only under the provisions of the German Copyright Law of September 9,1965, in its current version, and permission for use must always be obtained from Springer. Violationsare liable to prosecution under the German Copyright Law.The use of general descriptive names, registered names, trademarks, etc. in this publication does notimply, even in the absence of a specific statement, that such names are exempt from the relevant protectivelaws and regulations and therefore free for general use.

    Cover design:deblik, Berlin

    Printed on acid-free paper

    Springer is part of Springer Science+Business Media (www.springer.com)

    Dr. Markus H. Muser

    Prof. Dr. med. Felix WalzAGUWinkelriedstrasse 27CH-8006 Zurich

    PD Dr. Kai-Uwe Schmitt

    Institute for Biomedical Engineering

    ETZ F90

    Prof. Dr. Peter F. Niederer (emeritiert)

    University and ETH Zurich

    Gloriastrasse 35CH-8092 Zurich

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    Preface

    Injury is a leading cause of death, hospitalisation and disability world-wide.

    The World Health Organization predicts that unintentional injuries arising

    from road traffic incidents will rise to take third place in the rank order of

    international disease burden by the year 2030. Although these statistics and

    the associated economic costs are staggering, the effect of unintentional

    injury and death from trauma is more apparent, and more disturbing, when

    seen personally. By a young age, nearly everyone in the world, regardless

    of region, wealth or education, has had a relative or someone that they

    know killed or disabled in an "accident". The quality of life and financial

    effects on the injured person and their families and friends are plainly

    evident and clearly devastating. Many unintentional injuries are in realitynot accidents; they could be prevented with changes in policy, education, or

    through improved safety devices. Arrayed against these preventable

    injuries, a diverse group of injury prevention researchers and practitioners

    work to decrease the incidence of unintentional injury.

    In trauma biomechanics, the principles of mechanics are used to

    understand how injuries happen at the level of the bones, joints, organs and

    tissues of the body. This knowledge is central in the development,

    characterization and improvement of safety devices such as helmets andseat belts and in the safe design of vehicles and equipment used for

    transportation, occupation and recreation. The field of trauma biomechanics

    is highly interdisciplinary, with engineers and physicists being centrally

    involved with medical practitioners and many other experts. This book,

    Trauma Biomechanics, is organized as a short primer of this subject and it

    provides a logical overview of the field. It is written to be accessible to a

    range of students or practitioners, while still providing considerable detail

    in each section. Each chapter contains plentiful and up-to-date references to

    guide readers who require more information on a particular topic.In contrast to the relative abundance of texts that describe basic

    biomechanics, sports biomechanics, gait analysis and orthopaedic

    biomechanics this is one of only two or three texts focused on trauma

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    biomechanics that I am aware of. I have used a previous version of the book

    as a required text for a combined senior undergraduate- and graduate- level

    Mechanical Engineering class called the "Fundamentals of Injury

    Biomechanics" at the University of British Columbia. The studentscommented positively on the layout and accessibility of the book and they

    used it as a key reference in the assigned problems and project work in the

    class. I think the short primer structure of the book helped to make it

    accessible to the students. It is possible to start reading at the beginning of

    any chapter and quickly come up to speed with the most important basic

    knowledge about the anatomy, tolerance and injury prevention techniques

    for that region of the body. This is of great utility for students but also for

    people working in injury research contexts were they can be asked to

    rapidly switch their focus from injury in one area of the body or from one

    mechanism to another. This can occur not only while studying in university

    but also in many industrial and academic research contexts. For example,

    this is frequently required of people working on government-sponsored

    injury reconstruction teams or who are engaged in reconstructing injuries in

    the litigation context.

    I recommend this book as a key basic resource for anyone interested in

    injury prevention. Everyone, from graduate students working in anacademic injury biomechanics setting to engineers, physicists, clinicians,

    surgeons, kinesiologists, biologists, statisticians and social scientists

    working in the broad field of injury prevention, frequently has questions

    about how injuries happen in various parts of the body. This book is an

    essential and accessible resource to anyone with these questions.

    Peter A. Cripton

    Associate Professor of Mechanical Engineering

    and Associate Faculty Member of the Department of Orthopaedics

    The University of British Columbia

    VI Preface

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    Preface - 2nd edition

    Everyday, more than 140000 people are injured, 3000 killed, and 15000

    disabled for life everyday on the world's roads. Likewise, sports related

    injuries are numerous and have a significant socio-economic impact. The

    field of trauma biomechanics, or injury biomechanics, uses the principles of

    mechanics to study the response and tolerance level of biological tissues

    under extreme loading conditions. Through an understanding of mechanical

    factors that influence the function and structure of human tissues,

    countermeasures can be developed to alleviate or even eliminate such

    injuries.

    This book, Trauma-Biomechanics, surveys a wide variety of topics ininjury biomechanics including anatomy, injury classification, injury

    mechanism, and injury criteria. It is the first collection I am aware of that

    lists regional injury reference values, or injury criterion, either currently in

    use or proposed by both U.S. and European communities. Although the

    book is meant to be an introduction for medical doctors and engineers who

    are beginners in the field of injury biomechanics, sufficient references are

    provided for those who wish to conduct further research, and even

    established researchers will find it useful as a reference for finding thebiomechanical background of each proposed injury mechanism and injury

    criterion. As more people become aware of and understand this subject, it

    will someday lead to better mitigation and prevention of automotive and

    sports related injuries. I like this book very much and believe that you will

    find the same.

    King H. Yang

    Professor of Biomedical Engineeringand Mechanical Engineering

    Director of Bioengineering Center

    Wayne State University

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    Acknowledgements

    The positive feedback that we have obtained from students and colleagues

    and in particular from our readers of the previous editions was the major

    source of motivation to tackle this third edition. Thank you! We highly

    appreciate the various suggestions which were of great help to further

    develop the book.

    In the present third edition the contents were updated with the latest

    knowledge and references and known mistakes and typos were corrected

    (surely adding a few new ones). As a particularly important addition for

    students, exercises of various levels of complexity were added.

    Nevertheless, we kept the original focus of the book. It primarily offers an

    introductory overview on different aspects of trauma biomechanics, butalso serves as a quick reference for experts.

    Thus we hope to provide a suitable starting point for sharing our

    excitement and enthusiasm about this field of biomechanics research.

    Kai-Uwe Schmitt, Peter Niederer, Markus Muser, Felix Walz

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    XII Contents

    8.7 Exercises.........................................................................................226

    8.8 References .....................................................................................227

    9 Impairment and injuries resulting from chronic mechanical exposure...2319.1 Occupational health ........................................................................235

    9.2 Sports..............................................................................................237

    9.2.1 Non contact sports ....................................................................237

    9.2.2 Contact sports ...........................................................................239

    9.3 Household work .............................................................................239

    9.4 Summary ........................................................................................239

    9.5 References ......................................................................................240

    10 Solutions to exercises ..........................................................................243

    11 Subject index .......................................................................................247