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Overview of Low Back Pain Disorders

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Overview of Low Back Pain Disorders C H A P T E R Overview of Low Back Pain Disorders 43 Khalid M. Malik, MD, FRCS b Rasha S. Jabri, MD b Honorio T. Benzon, MD Pain originating from the spine usually manifests as pain such as physical stress and the asymmetry of physical in the low back and neck, and infrequently as pain in the tasks.9,10 The psychosocial risk factors pertain to psycho- upper lumbar and mid back areas. Spinal pain (SP) can genic stress and are often related to job satisfaction, be grouped into three broad categories: acute pain when responsibility, and variety.11,12 Personal risk factors have the pain duration is between 2 to 4 weeks; subacute pain been acknowledged as physical, familial, anthropometric, when the pain persists for up to 12 weeks; and chronic gender, and personality traits.13,14 The following risk pain, when the pain continues for more than 12 weeks. factors have been associated with the development of Chronic SP could be further categorized as persistent or spinal pain: recurrent pain. l Jobs that are stressful and that require heavy lifting and use of heavy equipment15 EPIDEMIOLOGY l Cigarette smoking16,17 l Psychiatric, emotional, and personality issues11,12 Although acute SP is frequently self-limiting, chronic SP is l Obesity17 often persistent and recurring in character. Almost 30% l Spinal deformities and endplate injury18 of the patients with acute onset low back pain (LBP) will l Genetic predisposition19 progress to develop chronic LBP that is typically recalci- l Peripheral vascular disease20 trant to available treatments.1,2 This fact is evidenced by the decreased likelihood of return to work with increasing SP duration. The workers who were off work for 6 months with LBP had lifetime return to work rate of only 50%; this rate ANATOMY further dropped to 25% for workers who were off work for The human vertebral column consists of 7 cervical, 12 tho- 1 year, and to less than 5% for those who were off work for racic, 5 lumbar, 5 sacral, and 3 to 5 coccygeal vertebrae. 2 years.3 Despite the availability of a wide array of treatment Except for the sacral and coccygeal vertebrae, which are choices to SP patients offered by both conventional and normally fused, two adjacent vertebral bodies and an inter- other approaches, morbidity from SP has continued to rise vening intervertebral disc comprise a vertebral motion seg- sharply, satisfaction among SP patients has remained low, ment. The linear array of adjacent spinal motion segments and SP has remained the most prevalent cause of pain and forms the continuum of the spinal column that houses dor- disability in advanced industrialized nations.1,2 In addition sally the neural elements of spinal cord and nerve roots of to its chronic unrelenting nature, chronic SP patients are the cauda equina. The latter are encompassed dorsally and also prone to psychosocial, behavioral, and substance abuse– laterally by the neural arch, which is comprised of spinous and disability-related issues. Chronic SP therefore poses processes, spinal laminae and the ligamenta flava posteri- substantial challenges to individuals, their families, and the orly, and pedicles and intervertebral foraminae laterally. In community as a whole. addition to the linkage of the vertebral bodies by interver- The epidemiologic studies of chronic SP are approxima- tebral discs, the adjacent vertebral bodies are articulated tive by nature, because the conditions causing SP in general dorsally by a pair of synovial joints, the zygapophysial or are nonhomogenous and are often inadequately defined. facet joints. Various components of the spinal column also The lifetime incidence of LBP is therefore reported vari- enable attachment of the omnipotent trunk muscles and ably, ranging from 14% to as high as 90%.1,2,4 Acute LBP spinal ligaments. The most significant of the spinal liga- has been ranked as the fifth most common reason for all ments include the anterior and posterior longitudinal liga- physician visits; in a given year almost 50% of adults will ments and ligamentum flavum. The incredible forces ap- have LBP.5 The financial and socioeconomic impact of SP plied to the spinal column are transmitted to the lower to society is also colossal. For instance, the direct costs of extremities by two large synovial-fibrous joints, the sacro- health care for LBP disorders in the United States have iliac joints. been estimated at over $20 billion annually, whereas the The vertebral bodies are largely composed of cancellous indirect cost estimates are even higher, at over $50 billion bone housed in a thin layer of cortical bone. The interver- annually.6,7 In the United States, LBP has been cited as the tebral discs (IVDs) are made of annulus fibrosus (AF), most prevalent reason for lost work time, workers’ com- nucleus pulposus (NP), and vertebral endplates. The dis- pensation claims, and early social security disability.8 tinction between the AF and NP is most apparent at the lumbar levels and diminishes with advancing age. Both the NP and AF are populated by sparsely present cells im- RISK FACTORS mersed in abundant intercellular matrix. Cells populating The risk factors associated with SP have been classified the NP are found in clusters and are chondrocyte-like, into three broad categories: biomechanical, psychosocial, whereas the cells found in AF have fibrocytic features.21 The and personal. The biomechanical risk factors are deter- matrix composition of the two disc compartments is also mined by spinal loading, and typically include parameters significantly different. NP matrix is jelly-like, and is made 294 © Copyright 2011 Elsevier Inc., Ltd., BV. All rights reserved. CHAPTER 43 Overview of Low Back Pain Disorders 295 of high concentration of water and proteoglycans, whereas above and below. The posterior primary ramus, soon after matrix constituting AF is high in collagen arranged in the its division from the anterior primary ramus, branches into form of interlacing lamellae. These collagenous lamellae medial and lateral branches. The medial branch of the are firmly attached to the adjacent vertebral bodies and are posterior primary ramus supplies most dorsal spinal col- most dense anteriorly.21 Although the cancellous vertebral umn components, including facet joints, posterior neural bodies and the spinal canal contents are highly vascular, arch components, and spinous processes. The AF of the the IVDs are mostly avascular and the largest avascular IVD therefore has complex innervation from several structure in the body. The normal NP and inner third of sources and multiple spinal segments, including contribu- the AF completely lack any vasculature; moreover, the tions from the sinuvertebral nerves, segmental spinal avascular cartilaginous endplates act as a barrier separating nerve, gray ramus communicans nerve, and the sympa- the vertebral body vasculature from the IVD contents.21 thetic trunk; thus, a normal IVD has rich autonomic con- Innervation of the IVDs and the neural canal contents nections. The latter may contribute to the hyperalgesia (Fig. 43-1) is mainly by nerve plexuses along the anterior often exhibited by the chronically painful disc. Although and posterior longitudinal ligaments.22 The nerve plexus almost all components of a spinal motion segment have along the posterior longitudinal ligament receives its been implicated in generating pain, the pain receptors— input mainly from the sinuvertebral nerve and the gray mostly mechanoreceptors—are found mainly in the spinal rami communicans, while the plexus along the anterior ligaments, paraspinal muscles, vertebral body periosteum, longitudinal ligament is contributed to mainly by the gray and the outer third of the AF and facet joints.21,23 rami communicans.22 The sinuvertebral nerve originates from the segmental spinal nerve as it exits the interverte- bral foramen; it re-enters the vertebral canal and contrib- PATHOPHYSIOLOGY utes mostly to the posterior longitudinal plexus. In addi- The forces applied to the spinal column are borne directly tion to the segmental spinal nerve, the sinuvertebral nerve and efficiently by the vertebral bodies and the IVDs.24 The also receives contribution from the gray rami communi- flexibility and remarkable range of motion exhibited by an cans.22 The posterior longitudinal ligament plexus inner- active spine depend almost entirely on the cumulative plas- vates the ventral half of the vertebral column, including ticity exhibited by the individual IVDs. The individual the anterior dura and posterior intervertebral discs. The IVD, however, is only moderately plastic and the NP, like gray ramus communicans nerve emerges from the spinal the vertebral body, is practically incompressible due to its segmental nerve; soon after, it enters the intervertebral high water content. The compressive forces applied to the foramina and runs anteriorly along the inferior third of the IVD are borne by the NP and are distributed equally to vertebral body. It connects to the sympathetic trunk before the AF as a tensile force.25 branching into lateral and anterior branches to innervate NP incompressibility is maintained almost exclusively the lateral and anterior disc annulus of the disc levels by the hydrostatic pressure generated by its proteoglycan FIGURE 43-1 Segmental innervation of the lumbar spine. (From Paris SV: Anatomy as related to function and pain. Symposium on Evaluation and Care of Lumbar Spine Problems. Orthop Clin North Am 14:475–489, 1983.) 296 SECTION VI Chronic Pain Syndromes content,21 which is a function of intricate metabolic pro- cesses.26 Being mostly avascular, IVD obtains metabolic TABLE 43–1 Etiology of Spinal Pain requirements almost exclusively by diffusion from capil- lary plexuses in adjacent vertebral bodies and the outer AF. Mechanical Spinal Pain Discal catabolic activities are in addition facilitated by Herniated discs discal matrix metalloproteinases (MMPs).27 A delicate Spondylosis or degenerative disc disease balance therefore exists in the NP between the anabolic Discogenic pain, internal disc disruption, or annular tears activities of the disc cells and the enzymatic catabolic Spondylolisthesis or displacement of one vertebral body over the activities.
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