Background
Enteropathic arthropathies comprise a larger collection of rheumatologic conditions that share a link to GI pathology, although the term typically refers to the inflammatory spondyloarthropathies associated with inflammatory bowel disease (IBD) and to reactive arthritis caused by bacterial (eg, Shigella, Salmonella, Campylobacter, Yersinia, Clostridium difficile) and parasitic (eg, Strongyloides stercoralis, Giardia lamblia, Ascaris lumbricoides, Cryptosporidium species) infections. Psoriatic arthritis, ankylosing spondylitis (AS), and undifferentiated spondyloarthropathy are the other conditions included in the inflammatory spondyloarthropathies that share common clinical and possible etiologic features.
Other GI conditions with musculoskeletal manifestations include intestinal bypass (jejunoileal) arthritis, celiac disease, Whipple disease, and collagenous colitis.
Pathophysiology
The precise causes of enteropathic arthropathies are unknown. Inflammation of the GI tract may increase permeability, resulting in absorption of antigenic material, including bacterial antigens. These arthrogenic antigens may then localize in musculoskeletal tissues (including entheses and synovium), thus eliciting an inflammatory response. Alternatively, an autoimmune response may be induced through molecular mimicry, in which the host's immune response to these antigens cross-reacts with self-antigens in synovium and other target organs.
Of particular interest is the strong association between reactive arthritis and HLA-B27, an HLA class I molecule. A potentially arthrogenic, bacterially derived antigen peptide could fit in the antigen-presenting groove of the B27 molecule, resulting in a CD8+ T-cell response. HLA-B27 transgenic rats develop features of enteropathic arthropathy with arthritis and gut inflammation.
Epidemiology
Frequency
United States
The prevalence of ulcerative colitis (UC) and Crohn disease (CD) is estimated to be 0.05-0.1%, with an increasing incidence for each in the last few decades. While extraintestinal manifestations affecting the skin, eyes, and joints, among other systems, develop in about one quarter of patients with IBD, musculoskeletal manifestations are the most common, with approximately 5-20% of individuals with IBD developing peripheral arthritis and/or spondylitis. The prevalence of IBD in AS is 5-10%, although up to one third to two thirds of patients with AS have been found to have subclinical inflammation by colonoscopy. Axial involvement occurs more commonly in CD than in UC.
International
The incidence and prevalence rates of ulcerative colitis and Crohn disease in northern and Western Europe are similar to those in the United States, but rates are lower in other regions of the world.
Race
The incidence of IBD is higher in whites, especially those of Jewish descent, than in other racial groups.
Sex
The peripheral arthritis of ulcerative colitis or Crohn disease does not have a sexual predilection.
IBD-associated AS occurs equally in men and women, while idiopathic AS is 2.5 times more common in men.[1]
Whipple disease is more common in men, with a male-to-female ratio of 9:1.
Age
IBD is most common in persons aged 15-35 years. Axial involvement in IBD occurs at any age, in contrast to idiopathic AS, which affects men younger than 40 years.
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