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Movement, Stability Lumbopelvic Pain
 
 For Churchill Livingstone:
 
 Senior Commissioning Editor: Sarena Wolfaard Associate Editor: Claire Wilson; Claire Bonnett Project Manager: David Fleming; Jane Dingwall Design: Stewart Larking Illustration Manager: Bruce Hogarth
 
 2nd
 
 Edition
 
 Movement, Stabi ity & Lumbopelvic Pain Integration of Research and Therapy Edited by
 
 Andry Vleeming
 
 PhD
 
 Clinical Anatomist and Founder Spine and Joint Center, Rotterdam, The Netherlands
 
 Vert Mooney
 
 MD
 
 Measurement Driven Rehabilitation Systems, San Diego, CA, USA
 
 Rob Stoeckart
 
 PhD
 
 Department of Neuroscience, Erasmus MC, Rotterdam, The Netherlands
 
 Illustrations by Philip Wilson Chartwell CHURCHILL LIVINGSTONE
 
 ELSEVIER Edinburgh
 
 London
 
 New York
 
 Oxford
 
 Philadelphia
 
 St Louis
 
 Sydney
 
 Toronto
 
 2007
 
 CHURCHILL LIVINGSTO E ELSEVIER
 
 CHURCHILL LtVI
 
 GSTONE
 
 An imprint of Elsevier Limited Pearson Professional Limited 1997 C Harcourt Publishers Limited
 
 2007, Elsevier Limited. SV Paris 2007 h 26 Ch 35 SM McGill 2007
 
 1999
 
 All rights reserved.
 
 The right of Andry V lceming, Vert Mooney and Rob StOl."'Ckart to be identified as editors of this work has been asserted by them in accordance with the Copyright, Designs and Patents Act
 
 1988
 
 o part of this publication may be reproduced. slored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical. photocopying. recording or otherwise, without either the prior permission of the publishers or a licence permitting restricted copying in the United Kingdom issued by the Copyright Licensing Agency, 90 Totlenham Court Road, London W,T 4LP. Permissions may be sought directly from Elsevier's Health Sciences Rights Department in Philadelphia, USA: phone:
 
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 1997
 
 Reprinted 1999 Second edition 2007
 
 ISS
 
 9780443101786
 
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 I
 
 Contents viii
 
 Contributors
 
 x
 
 Preface ...
 
 SECTION 2 Evolution, biomechanics and kinematics 9
 
 PART 1 Biomechanical, clinical-anatomical and
 
 Evolution of the human lumbopelvic region and its relationship to some clinical deficits
 
 evolutionary aspects of lumbopelvic pain and
 
 of the spine and pelvis
 
 dysfunction
 
 . . . . . . . . . 141
 
 CO Lovejoy
 
 10
 
 SECTION 1 Clinical-anatomical aspects
 
 . 159
 
 A Huson
 
 The muscular, ligamentous, and neural 11
 
 structure of the lumbosacrum and its relationship to low back pain . . . . .
 
 Kinematic models and the human pelvis .............. .
 
 How to use the spine, pelvis, and legs effectively in lifting. . . . . . . .
 
 5
 
 . 167
 
 MA Adams, P Dolan
 
 FHWiliard 2 Anatomical linkages and muscle slings of the
 
 12
 
 Is the sacroiliac joint an evolved
 
 lumbopelvic region . . . . . . . . . . . .47
 
 costovertebral joint?
 
 C DeRosa, JA Porterfeld
 
 S Gracovetsky
 
 3 Anatomy and biomechanics of the lumbar
 
 . . . . . . . . . . 185
 
 13 The evolution of myths and facts
 
 fasciae: implications for lumbopelvic control
 
 regarding function and dysfunction of
 
 and clinical practice . . . . . . . . . . . .63
 
 the pelvic girdle . . . . . . . . . . . . . 191
 
 PJ Barker, CA Br-iggs
 
 o Lee
 
 4 Clinical anatomy of the anterolateral abdominal
 
 muscles. . .
 
 . . . . . .75
 
 PART 2 Insights in function and dysfunction of the
 
 OM Urqullart. PW Hodges
 
 lumbopelvic region
 
 5 Clinical anatomy of the lumbar
 
 multifidus . .
 
 6
 
 . . . . . .85
 
 14 Anatomical, biomechanical, and clinical
 
 L Danneels
 
 perspectives on sacroiliac joints: an integrative
 
 Clinical anatomy and function of psoas major
 
 synthesis of biodynamic mechanisms
 
 and deep sacral gluteus maximus . . . . .95
 
 related to ankylosing spondylitis. . . . . 205
 
 SGibbons
 
 AT Masi, M Benjamin, A Vleeming
 
 7 The sacroiliac joint: sensory-motor control
 
 15 A suspensory system for the sacrum in pelvic
 
 and pain. . . . . . . . . . . . . . . . . 103
 
 mechanics: biotensegrity . . . . .
 
 A Indahl, S Holm
 
 SMLevin
 
 8 The role of the pelvic girdle in coupling the
 
 16 Why and how to optimize posture.
 
 perspective on pelvic stability . . . . . . 113
 
 . 239
 
 RElrvin
 
 spine and the legs: a clinical-anatomical AVleemrng, R S toeckart
 
 . 229
 
 17
 
 Gait style as an etiology to lower back pain . . . . . . . . . . . . . . . . 253 HJ Dananberg
 
 vi
 
 Contents
 
 18 A detailed and critical biomechanical analysis
 
 of the sacroiliac joints and relevant kinesiology: the implications for lumbopelvic function and dysfunction . . . . . . . . . . .
 
 . 265
 
 PART 4 Guidelines
 
 29
 
 RL Don1igny
 
 19
 
 Stability or controlled instability?
 
 European guidelines for prevention in low back pain . . . . . . . . . . . . . . 429 G Mullel on behalf of the COST 813
 
 . 279
 
 Working Group on European Guidelines foI
 
 S Gracovetsky
 
 Prevention in L ow 8ack Pain
 
 30
 
 PART 3 Diagnostic methods
 
 Evidence-based medicine for acute and chronic low back pain: guidelines . . . . 447 M van Tulder, 8 Koes
 
 SECTION 1 Visualization in relation to pelvic
 
 31
 
 dysfunction 20
 
 AVleeming et al on behalf of the COST 813
 
 Basic problems in the visualization of the sacroiliac joint . . . . . . . . . "
 
 CT and MRI of the sacroiliac joints
 
 Working Group on Pelvic Gildle Pain
 
 . 299
 
 PF Dijkstra
 
 21
 
 European guidelines on the diagnosis and treatment of pelvic girdle pain. . . . 465
 
 .311
 
 JMD O'Neill, E Jurriaans
 
 PART 5 Effective training and treatment
 
 SECTION 1 Psychological, social and motivational
 
 22 Visualization of pelvic biomechanical
 
 dysfunction . . . . . . . . . . . . . . . 327 TRavin
 
 aspects 32
 
 Behavioral analysis, fear of movement! (re)injury and cognitive-behavioral management
 
 SECTION 2 The pelvic girdle
 
 of chronic low back pain . . . . . . . .475 JWS Vlaeyen. LMGVancleef
 
 23
 
 Movement of the sacroiliac joint with special reference to the effect of load .
 
 . 343
 
 8Sturesson
 
 24 What is pelvic girdle pain?
 
 ..
 
 . 353
 
 SECTION 2 Motor control 33
 
 HCOstgaard
 
 25
 
 The pattern of intrapelvic motion and
 
 34
 
 lumbopelvic muscle recruitment alters in the presence of pelvic girdle pain .
 
 Functional control of the spine. . . . . . 489 PW Hodges, J Cholewicki Motor control in chronic pain: new ideas for effective intervention .
 
 . 361
 
 . . 513
 
 G Lorimer Moseley
 
 8 Hungeliol-d, W Gilleard
 
 SECTION 3 Different views on effective training SECTION 3 Low back 26
 
 27
 
 Differential diagnosis of low back pain . . 381
 
 35
 
 The painful and unstable lumbar spine:
 
 SV Paris, J Viti
 
 a foundation and approach for
 
 Conditions of weight bearing: asymmetrical
 
 restabilization . . . . . . . . . . . . . . 529
 
 overload syndrome (AOS). . . . . . . . 391
 
 SMMcGili
 
 J A Porteliield, C DeRosa
 
 28
 
 and treatment
 
 36
 
 Important aspects for efficacy of treatment
 
 Evidence-based clinical testing of the
 
 with specific stabilizing exercises for
 
 lumbar spine and pelvis . . . . . . . . . 405
 
 postpartum pelvic girdle pain . . . . . . 547
 
 M Laslett
 
 8 Stuge, NKVollestad
 
 Contents
 
 37
 
 Breathing pattern disorders and back pain . . . . . . . . . . . . . . . . 563 LChaitow
 
 38
 
 Effective rehabilitation of lumbar and pelvic
 
 PART 6 Integrating different views and opinions when dealing with a complex system 39
 
 An intregrated approach for the management
 
 girdle pain. . . . . . . . . . . . . . . . 573
 
 of low back and pelvic girdle pain: a case
 
 V Moolley
 
 report . .
 
 .
 
 .
 
 .
 
 .
 
 .
 
 .
 
 .
 
 . . . . . . . . . 593
 
 o Lee 40 An integrated therapeutic approach to the
 
 treatment of pelvic girdle pain .
 
 .
 
 .
 
 . . 621
 
 o Lee. AVleeming Index . . .
 
 .
 
 . . . . . . . . . . . . . . 639
 
 vii
 
 Contributors MA Adams BSe PhD
 
 RL DonTigny PT
 
 Senior Research Fellow, Department of Anatomy,
 
 Physical Therapist, Havre, Montana, USA
 
 University of Bristol, Bristol, UK
 
 S Gibbons BSe (Hons) PT MSe MCPA
 
 PJ Barker BAppSe(Physio) PhD
 
 Stability Physiotherapy, Mt. Pearl, Newfoundland,
 
 Senior Tutor, Department of Anatomy and Cell Biology,
 
 Canada
 
 The University of Melbourne, Victoria, Australia
 
 W Gilieard PhD
 
 M Benjamin PhD
 
 Senior Lecturer in Biomechanics, School of Exercise
 
 Professor of Musculoskeletal Biology and Sports
 
 & Sports Management, Southern Cross University,
 
 Medicine Research, School of Biosciences, Cardiff
 
 Lismore, Australia
 
 University, Cardiff, UK
 
 CA Briggs BSe Dip Ed MSe PhD Associate Professor and Deputy Head, Department of Anatomy and Cell Biology, The University of Melbourne, Victoria, Australia
 
 S Graeovetsky PhD Retired, Concordia University, Montreal, QC, Canada
 
 PW Hodges BPhty (Hons) PhD MedDr Professor and NHMRC Principal Research Fellow, Division of Physiotherapy, The University of Queensland,
 
 L Chaitow NO DO Honorary Fellow, School of Integrated Health, University
 
 Brisbane, Australia
 
 of Westminster, London, UK; Editor-in-Chief, Journal of
 
 S Hoim
 
 Bodywork & Movement Therapies
 
 Professor, Department of Orthopaedics, Sahlgrenska University Hospital, Goteborg, Sweden
 
 J Cholewieki Associate Professor, Department of Orthopaedics &
 
 B Hungerford PhD
 
 Rehabilitation, Yale University School of Medicine, New
 
 Consultant Musculoskeletal Physiotherapist, Sydney
 
 Haven, CT, USA
 
 Spine & Pelvis Centre, Drummoyne, NSW, Australia
 
 HJ Dananberg DPM
 
 A Huson MD PhD
 
 Podiatrist, private practice, Catholic Medical Centre,
 
 Professor Emeritus, Maastricht University, The
 
 Bedford, New Hampshire, USA; Contributing Editor,
 
 Netherlands
 
 Journal of the American Podiatric Medical Association
 
 A Indahl MD PhD
 
 L Danneels PT PhD
 
 Consultant, Specialist in physical medicine and
 
 Professor of Rehabilitation Sciences and Physiotherapy,
 
 rehabilitation, Department of Physical Medicine and
 
 Faculty of Medicine and Health Sciences, Ghent,
 
 Rehabilitation, Hospital for Rehabilitation, Stavern,
 
 Belgium
 
 Norway
 
 C DeRosa PT PhD
 
 RE Irvin DO
 
 Professor of Physical Therapy, Northern Arizona
 
 Clinical Associate Professor, Dept of Osteopathic
 
 University, Flagstaff, Arizona, USA
 
 Manipulative Medicine, College of Osteopathic Medicine, Oklahoma State University Health Science Center, Tulsa,
 
 PF Dijkstra MD DlC PhD Former Radiologist, Academic Medical Centre,
 
 Oklahoma, USA
 
 Amsterdam, The Netherlands; Former Head of
 
 E Jurriaans BSe MBChB DTM&H FRCR(UK) FRCP(C)
 
 Department of Radiology, Jan van Breemen Institute for
 
 Associate Professor, McMaster University, Faculty of
 
 Skeletal Disease, Amsterdam, The Netherlands
 
 Health Sciences, Hamilton, Ontario, Canada; Staff Radiologist, St. Joseph's Healthcare, Hamilton, Ontario,
 
 P Dolan PhD Reader in Biomechanics, Department of Anatomy, University of Bristol, Bristol, UK
 
 Canada
 
 ix Contributors B Koes PhD
 
 JA Porterfield PT MA ATC
 
 Professor of General Practice, Head of Research
 
 Owner, Rehabilitation and Health Center, Inc., Akron,
 
 Department, Department of General Practice, Erasmus
 
 Ohio; CEO, Venture Practice Services Ltd., Akron, Ohio,
 
 MC, University Medical Centre, Rotterdam, The
 
 USA
 
 Netherlands
 
 T Ravin MD
 
 M Laslett PhD NZRP Dip MT Dip MDT
 
 Physician; President of the American Association of
 
 Senior Clinician, Phy sioSouth @ Moorhouse Medical
 
 Musculoskeletal Medicine, Denver, Colorado, USA
 
 Clinic, Christchurch, New Zealand
 
 R Stoeckart PhD
 
 D Lee BSR FCAMT
 
 Department of Neuroscience, Erasmus MC, Rotterdam,
 
 Clinical and Education Consultant, Diane Lee &
 
 The Netherlands
 
 Associates, Canada
 
 B Stuge PT PhD
 
 SM Levin MD FACS
 
 Senior Researcher, Institute of Nursing & Health
 
 Director, Ezekiel Biomechanics Group, McLean, VA, USA
 
 SCiences, University of Oslo, Norway
 
 CO Lovejoy MA PhD
 
 B Sturesson MD PhD
 
 University Professor of Anthropology, Department of
 
 Head of Spine Unit, Department of Orthopaedics,
 
 Anthropology and Division of Biomedical Sciences, Kent
 
 Angelholm Hospital, Angelholm, Sweden
 
 State University and Northeast Ohio Universities College of Medicine, Ohio, USA
 
 M van Tulder PhD Professor, Institute for Research in Extramural Medicine
 
 AT Masi MD DR PH
 
 (EM GO) and Institute for Health Sciences (HIS), V U
 
 Professor of Medicine, University of Illinois College of
 
 University Medical Centre, Amsterdam, The Netherlands
 
 Medicine at Peoria ( UICOMP), Illinois, USA
 
 DM Urquhart BPhysio(Hons) PhD
 
 SM McGill
 
 Dept of Epidemiology & Preventive Medicine, Monash
 
 Professor, Faculty of Applied Health Sciences, Dept of
 
 University, Victoria, Australia
 
 Kinesiology, University of Waterloo, Ontario, Canada
 
 LMG Vancleef MSc
 
 V Mooney MD
 
 Dept Medical, Clinical and Experimental Psychology,
 
 Clinical Professor of Orthopaedics, USSD, Private
 
 Maastricht University, The Netherlands
 
 Practitioner, San Diego, California, USA
 
 J Viti
 
 G Lorimer Moseley PhD BAppSc(Phty)(Hons)
 
 Assistant Professor, University of St. Augustine for
 
 Nuffield Medical Research Fellow, Centre for fMRI of
 
 Health Sciences, St. Augustine, Florida, USA
 
 the Brain and Dept of Human Anatomy & Genetics, University of Oxford, UK
 
 JWS Vlaeyen PhD
 
 G Muller
 
 Maastricht University, The Netherlands
 
 Dept Medical, Clinical and Experimental Psychology, Orthopaedic Surgeon, Sports Medicine, Manual Therapy, Chairman of Rueckenzentrum Am Michel, Hamburg,
 
 A Vleeming PhD
 
 Germany
 
 Clinical Anatomist and Founder, Spine and Joint Center, Rotterdam, The Netherlands
 
 JMD O'Neill MB BAO BCh MRCPI MSc FRCR(UK) Assistant Professor, McMaster University, Faculty of
 
 NK V"lIestad PhD
 
 Health Sciences, Hamilton, Ontario, Canada; Staff
 
 Professor, Head of Institute of Nursing & Health
 
 Radiologist & Director - Musculoskeletal Imaging, St.
 
 Sciences, University of Oslo, Norway
 
 Joseph's Healthcare, Hamilton, Ontario, Canada
 
 FH Willard PhD
 
 HC Ostgaard MD PhD
 
 Professor, College of Osteopathic Medicine, Family
 
 Associate Professor, Chief of Dept of Orthopaedics,
 
 Medicine, University of New England, Biddeford, Maine,
 
 Sahlgren University Hospital, Molndal, Sweden
 
 USA
 
 SV Paris PT PhD FA PTA President, University of St. Augustine for Health Sciences, St. Augustine, Florida, USA
 
 Preface There are a large number of books dealing with
 
 and several others.
 
 the lumbar spine and pelvis, so why this book
 
 into the following parts:
 
 on
 
 1.
 
 Movement, Stability and Lumbopelvic Pain?
 
 This
 
 Biomechanical, clinical-anatomical and evolutionary aspects of lumbopelvic pain and
 
 question is pertinent as there are several excellent books available which cover these topics. Our
 
 dy sfunction 2.
 
 reasons are diverse.
 
 In the book they are grouped
 
 InSights in function and dysfunction of the lumbopelvic region
 
 Firstly, several distinguished scientists, physicians and other specialists have lately provided evidence
 
 3.
 
 Diagnostic methods
 
 based, relevant new data on the lumbopelvic
 
 4.
 
 Guidelines
 
 area. This forces us to look afresh at the adequacy
 
 5.
 
 Effective training and treatment
 
 of current diagnostic and therapeutic methods.
 
 6.
 
 Integrating different views and opinions when
 
 Secondly, most books deal either with the low back or with the pelvic girdle; our aim is to collect all
 
 dealing with a complex system. The studies reviewed in this book reflect the
 
 relevant material in one book. Thirdly, most books
 
 specialties of the contributors, their backgrounds,
 
 on the subject are written by one expert or by a small
 
 sty les, approaches and specific ideas about how
 
 team of experts. This makes it difficult to get a grip
 
 lumbopelvic structures function and dy sfunction.
 
 on the vast wealth of information available. Finally,
 
 Several chapters were written by authors with a
 
 and probably most importantly, notwithstanding all
 
 unique concept about the origin of pain and dys
 
 efforts to treat patients adequately, large numbers
 
 function of lumbopelvic structures and about the
 
 of patients still suffer chronically from low back
 
 therapy requested. In a way this is hazardous since
 
 pain and/ or pelvic girdle pain. It is our hope and
 
 certain authors were invited, not because of their
 
 ambition to provide, together with all contributors,
 
 evidence-based approach, but since in the opinion
 
 an integrated book that can be of help to people
 
 of the
 
 involved in the diagnosis or treatment of patients
 
 controversial ideas merit attention. Their concepts
 
 with lumbopelvic pain.
 
 should invite sound research that can confirm,
 
 The contributors to this book include scientists
 
 refute,
 
 editors
 
 their audacious and
 
 or adapt
 
 the
 
 sometimes
 
 ideas presented.
 
 We are
 
 of internationally renowned clinical groups and
 
 convinced that the wealth of information presented
 
 departments dealing with basic sciences. Their
 
 by the contributors will help to create rational and
 
 contributions
 
 are
 
 from
 
 different
 
 disciplines
 
 embracing anthropology, orthopedic surgery, bio mechanical
 
 engineering,
 
 chiropractic
 
 effective treatment programs for the management of lumbopelvic pain and dysfunction.
 
 practice,
 
 anatomy, osteopathy, physical therapy, podiatry,
 
 Andry V leeming, Vert Mooney and
 
 gynecology, rehabilitation medicine, epidemiology
 
 Rob Stoeckart
 
 Section One Biomechanical, c1inical anatomical and evolutionary aspects of lumbopelvic pain and dysfunction: Clinical anatomical aspects The muscular, ligamentous, and neural structure of the lumbosacrum and its relationship to low back pain FH Willard
 
 2 Anatomical linkages and muscle slings of the
 
 lumbopelvic region C DeRosa, JA Porterfield
 
 3 Anatomy and biomechanics of the lumbar fasciae: implications for lumbopelvic control and clinical practice PJ Barker, CA Briggs
 
 4 Clinical anatomy of the anterolateral abdominal
 
 muscles OM Urquhart, PW Hodges 5 Clinical anatomy of the lumbar multifidus L Danneels
 
 ..__..__ 6
 
 Clinical anatomy and function of psoas major and deep sacral gluteus maximus S Gibbons
 
 7 The sacroiliac joint: sensory-motor control and
 
 pain A Indahl, S Holm
 
 8 The role of the pelvic girdle in coupling the spine and the legs: a clinical-anatomical perspective on pelvic stability A Vleeming, R Stoeckart
 
 The muscular, ligamentous, and neural structure of the lumbosacrum and its relationship to low back pain FH Willard
 
 INTRODUCTION The lumbosacral spinal column performs a key role in the transfer of weight from the torso and upper body into the lower extremities, both in static positions and during mobility. The primary bony structures involved in this force transduction are: five lumbar vertebrae, a sacrum, two innominate bones, and the two femoral heads. Critical to the stability of these bony components is a complex arrangement of dense corulective tissue. Although typically described as separate entities in most textbooks of anatomy, these fibrous, soft-tissue structures actually form a continuous ligamentous stocking in which the lumbar vertebrae and sacrum are positioned. The major muscles representing the prime movers in this region - such as the multifidus, gluteus maximus, and biceps femoris - have various attachments to this elongated, ligamentous stocking. The muscular and ligamentous relationships composing the lumbosacral connection are of extreme importance in stabilizing the lumbar vertebrae and sacrum during the transfer of energy from the upper body to the lower extremities. This arrangement has been termed a 'self-bracing mechanism' (Vleeming et a1 1995c) and, as such, its dysfunction is critical to the failure of the lower back. A critical relationship also exists between the neural components of the lumbosacral region and the surrounding ligamentous structures. Traumatic, inflammatory, and degenerative disease processes affect the structure of the lumbosacral region and impact on the surrounding nerves. Current research, using immunohistochemical techniques to identify specific types of axons, suggests that all of these connective tissue structures receive a supply of small-caliber, primary afferent fibers (Ab and C-fibers),
 
 6
 
 Movement, Stability and Lumbopelvic Pain
 
 typical of those involved in nociception. Irritation of these primary afferent nociceptive axons initiates the release of neuropeptides that interact with fibroblasts, mast cells, and immune cells present in the surrounding connective tissue (Levine et al 1 993). The resultant cascade of events, referred to as a neurogenic inflammatory response, is thought to play a major role in degenerative diseases and the development of low back pain (Garrett et al 1992, Kidd et a1 1 990, Schaible et al 2005, Weidenbaum & Farcy 1 990, Weinstein 1992). Sensitization of these small-caliber, primary afferent fibers, along with sensitization of their central connections in the dorsal horn of the spinal cord, appears to play a crucial role in the evolution of chronic painful conditions (Coderre et al 1993, Ji et al 2003, Woolf & Chong 1 993). This chapter examines recent advances in our knowledge of the lumbosacral region structural architecture, pathology, and innervation.
 
 Ligamentous structure of the lumbar region The various ligaments of the lumbar vertebral column form a continuous, dense, connective-tissue stocking surrounding the vertebrae and extending into the sacral area. For ease of description, the vertebral connective tissue sheath can be divided into three parts: (1) the neural arch sh'uctures; (2) the capsular structures; and (3) the ventral or vertebral body structures (Fig. 1 .1). However, it should be noted that the partitions between each of these three divisions are for convenience only, as the connective tissue of the dorsal and ventral components is essentially continuous across the pedicles of the vertebrae. Neural arch ligaments The neural arch of each I umbar vertebra is composed of the pedicles, laminae, transverse processes, and spine (Figs 1.1 and 1 .2). Two major ligaments participate in surrounding the neural arch: the ligamentum flavum and the interspi.nous ligament; two additional small ligaments are also described: the supraspinous ligament posteriorly and the intertransverse ligament laterally. To view the ligaments of the neural arch, the multifidus muscle must be completely removed from the lumbosacral region (Figs 1 .2 and 1 .3). Although most of these ligaments have a distinct biochemical make-up when analyzed in isolation (Ballard & Weinstein 1 992, Fujii & Hamada 1993, Fujii et al 1993, Yahia
 
 Ventral
 
 Capsular
 
 Neural arch
 
 ligaments
 
 ligaments
 
 ligaments Superior articular
 
 --'--'\--- process ----- -( C , 1"...\"\ .. ) \ ') \ ( C ('
 
 (
 
 Transverse
 
 -