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Spondylo 4.26.04 Spondyloarthropathies Dafna Gladman, MD, FRCPC Contents 1. Introduction 2. Ankylosing Spondylitis (AS) 3. Reactive Arthritis (ReA) 4. Psoriatic Arthritis 5. SAPHO Syndrome 6. Arthritis of Inflammatory Bowel Disease 7. Arthropathies Associated with Other Bowel Disease 8. Undifferentiated Spondyloarthropathy 9. Summary 10. References 11. Questions SPONDYLOARTHROPATHIES 1 1. Introduction The spondyloarthropathies are a group of inflamma - The inflammatory arthritis that affects the back in the tory arthritic conditions whose main clinical feature conditions classified among the spondyloarthropathie s is an inflammatory arthritis of the back. In the first manifests with pain associated with stiffness in the half of the last century, these conditions were con - buttocks and back. Radiological evidence of sacroili - sidered variants of rheumatoid arthritis (RA). How - itis and spondylitis may be documented on radio - ever, the discovery of rheumatoid factor in 1948 graphs of the pelvis and spine. Peripheral arthritis allowed the recognition that certain forms of inflam - may be associated with the spondylitis. Some of the matory arthritis were seropositive for rheumatoid features that distinguish the seronegative spondy - factor while others were seronegative; this facilitated loarthropathies from the seropositive forms of the classification of the rheumatologic conditions. It arthritis are documented in Table 1. was noted that the conditions that included inflam - matory back disease were seronegative. Table 1 A Comparison Between Seropositive and Seronegative Arthritis Feature Seronegative Seropositive Peripheral arthritis Usually asymmetric Usually symmetric Large joints Small and medium size joints Lower extremities Upper and lower extremities Axial involvement Sacroiliac joints Nil Apophyseal joints of spine Rarely rheumatoid inflammation Syndesmophytes Enthesitis Common Uncommon Periostitis Common Uncommon Tendinitis Achilles, plantar fascia Finger tendons Rheumatoid nodules Never Often Iritis Common Uncommon Aortic root dilatation Common Uncommon Scaly skin rash Common Unusual Bowel inflammation Common Unusual Urethritis Common Unusual 2 EDUCATIONAL REVIEW MANUAL IN INTERNAL MEDICINE. VOLUME I: RHEUMATOLOGY 2. Ankylosing Spondylitis (AS) Clinical Features Peripheral arthritis tends to be asymmetric and most commonly involves the lower extremities. There is often enthesitis, inflammation at the insertion of ten - Ankylosing spondylitis (AS) is primarily an inflam - 1 dons into bone. Certain extra-articular features are matory arthritis of the back. It involves the sacroiliac common to this group of conditions, including skin joints and the apophyseal joints of the spine. It affects and mucous membrane lesions, bowel complaints, men in a higher frequency than women (at a ratio of eye involvement, and aortic root dilatation. Another 5:1), with an age of onset usually in the late teens. AS feature common to the spondyloarthropathies is the begins with an insidious onset of pain and stiffness in familial aggregation, which occurs not only within the low back. The most characteristic feature of the 2 each condition, but also among the entities within back pain is pain at night. Patients often awaken in the group. An association with HLA-B27 has been the early morning between 2 AM and 5 AM with back documented in the diseases included in this group pain and stiffness, and usually take either a shower or that is now recognized as the “HLA-B27 seronega - exercise before resuming sleep. In time, AS pro - tive spondyloarthropathies.” The diseases included gresses to involve the whole spine and results in spinal in this group include: the prototype, ankylosing deformities, including flattening of the lumbar lordo - spondylitis; reactive arthritis (previously known as sis, kyphosis of the thoracic spine, and hyperextension Reiter’s syndrome); psoriatic arthritis; the arthritis of of the cervical spine. These in turn result in flexion inflammatory bowel disease; and an entity called contractures of the hips and knees with significant undifferentiated spondyloarthropathy (USpA). morbidity and disability. Other forms of arthritis associated with bowel dis - ease are also included. Peripheral Arthritis Peripheral arthritis occurs uncommonly in AS, but when it occurs, it is usually late in the course of the 3 arthritis. Peripheral arthritis developing early in the course of the disease is a predictor of disease progres - 4 sion. The arthritis usually presents in the lower extremities in an asymmetric distribution. Involve - ment of the “axial” joints, including shoulders and hips, is more common than involvement of more dis - tal joints. In the shoulder, there may be a unique lesion 5 of erosion at insertion of the rotator cuff. There may be progressive flexion deformity in the hips and even - tual destruction of the joint. Enthesitis Other sites of inflammation in AS include the tendons and their insertions. Common sites for tendinitis include the Achilles tendon and the plantar fascia. These present with pain which is inflammatory in nature, being worse with inactivity and improving with activity. Inflammation at tendon insertion, or enthesitis, is common at the site of the Achilles ten - don or the insertion of the plantar fascia, into the cal - caneous. Other sites include the ischial tuberosity, rotator cuff insertion, trochanteric area and the patel - lar tendon insertion. Enthesitis presents with pain that like the other articular manifestations is inflamma - tory in nature. It tends to be aggravated by rest and improve with activity. Several attempts to develop an instrument to assess enthesitis in AS have been pub - SPONDYLOARTHROPATHIES 3 Radiological Changes in AS lished. The Mander enthesitis index includes 66 sites, some of which may overlap with fibromyalgia tender 6 points. A recent modification of the Mander index, The radiological changes reflect the clinical disease the “Maastricht Ankylosing Spondylitis Enthesitis process. The sacroiliac joints are commonly the ini - Score” (MASES) reduced the number of sites to only tial sites of inflammation. They demonstrate ero - thirteen, and is likely to be more manageable clini - sions with subsequent ankylosis of the joints. The 7 13 cally. Recent evidence suggests that enthesitis may New York criteria describe the sacroiliac involve - be underestimated by clinical examination, and ment according to four grades: grade 1 is suspicious; that ultrasound is better suited to document these grade 2 shows erosions and sclerosis; grade 3 shows 8,9 features of AS. erosions, sclerosis, and early ankylosis; and grade 4 reflects total ankylosis. These radiographic changes Extra-articular Manifestations of AS reflect damage rather than inflammation. Magnetic Extra-articular features include: iritis, particularly Resonance Imaging (MRI) provides a better anterior uveitis; cardiac manifestations, including approach to identifying inflammation in the sacroil - 14,15,16 dilatation of the root of the aorta and conduction iac joints, and may help earlier diagnosis of AS. defects; fibrosis of the upper lobes of the lungs; cauda equina syndrome which results from multiple Radiologic Signs and Disease Progression thecal diverticulae or dilated lumbar sacs; and later In the spine, the thoracolumbar junction tends to be in the course of the disease, amyloidosis. an early site of involvement, with subsequent pro - gression both caudally and distally to affect the whole Uveitis, particularly acute anterior uveitis (AAU) spine. The early radiologic sign is the Romanus 10 17 occurs in 20% to 30% of patients. The eye involve - lesion, which reflects erosion at the disc margin. ment in AS is characterized by: 1) its acute presenta - Squaring of the vertebra then results, followed by the tion, usually in a unilateral distribution; 2) its fre - development of the syndesmophyte, as a conse - quent recurrence; and 3) the development of anterior quence of ossification of the outer layer of the synechiae, adhesions between the iris and the nucleus fibrosus of the intervertebral disc. In the late cornea. It has been suggested that uveitis in AS is stages of the disease, total ankylosis of the spine associated with more severe spondyloarthropathy. A occurs with ossification of the longitudinal ligaments. decrease in anterior uveitis was documented follow - 11 ing treatment with anti-TNF agents. The Bath Ankylosing Spondylitis Radiology Index (BASRI) provides a method for assessing the spine Aortic root dilatation was recognized in the 1960s as and the hip. It includes an assessment of erosions and a complication of AS. It was initially described syndesmophytes with values weighted by the number 18 among patients who had had the disease for a pro - of vertebral sites involved. The modified Stoke longed period. The pathology is similar to that of AS Ankylosing Spondylitis Spine Score (mSASSS) pro - in other areas. There is an initial inflammatory infil - vides a more detailed analysis of the changes in the 19 trate at the base of the aorta that results in fibrosis, spine in AS. The use of these indices together with which in turn leads to aortic root dilatation and con - clinical assessment is recommended when assessing 20 duction defects. Thus, patients with longstanding AS patients with AS. may present with a tambour quality of their second heart sound, an aortic diastolic murmur, or with first, The enthesitis observed in AS patients may be second and even complete heart block. Several detected radiologically by spurs at the insertion of 12 patients have
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