Reactive Arthritis Clinical Presentation
- Author: Carlos J Lozada, MD; Chief Editor: Herbert S Diamond, MD more...
History
ReA usually develops 2-4 weeks after a genitourinary or gastrointestinal infection. Recent evidence indicates that a preceding respiratory infection with Chlamydia pneumoniae may also trigger the disease.[3] About 10% of patients do not have a preceding symptomatic infection.
Both postvenereal and postenteric forms of ReA may manifest initially as nongonococcal urethritis. Mild dysuria, mucopurulent discharge, prostatitis and epididymitis in men, and vaginal discharge and/or cervicitis in women are other possible manifestations.
The onset of ReA is usually acute and characterized by malaise, fatigue, and fever. An asymmetrical, predominately lower-extremity, oligoarthritis is the major presenting symptom. Low-back pain occurs in 50% of patients. Heel pain is common because of enthesopathies at the Achilles or plantar aponeurosis insertion on the calcaneus. The complete Reiter triad of urethritis, conjunctivitis, and arthritis may occur.
Physical
- Joints, axial skeleton, entheses
- Peripheral joint involvement associated with ReA is typically asymmetric and usually affects the weight-bearing joints (ie, knees, ankles, hips), but the shoulders, wrists, and elbows may also be affected.
- In more chronic and severe cases, the small joints of the hands and feet may also be involved. As in other spondyloarthropathies, dactylitis (ie, sausage digits) may develop.
- While 50% of patients with ReA may develop low-back pain, most physical examination findings in patients with acute disease are minimal except for decreased lumbar flexion. Patients with more chronic and severe axial disease may develop physical findings similar to ankylosing spondylitis.
- As with other spondyloarthropathies, the enthesopathy of ReA may be associated with findings of inflammation (ie, pain, tenderness, swelling) at the Achilles insertion. Other sites include the plantar fascial insertion on the calcaneus, ischial tuberosities, iliac crests, tibial tuberosities, and ribs.
- Skin and nails
- Keratoderma blennorrhagica on the palms and soles is indistinguishable from pustular psoriasis and is highly suggestive of chronic ReA.
- Erythema nodosum may develop but is uncommon.
- Nails can become thickened and crumble, resembling mycotic infection or psoriatic onychodystrophy, but nail pitting is not observed.
- Circinate balanitis may also develop.
- Other mucosal signs and symptoms: Painless shiny patches in the palate, tongue, and mucosa of the cheeks and lips have been described.
- Ocular findings
- Conjunctivitis is part of the classic triad of Reiter syndrome and can occur before or at the onset of arthritis.
- Other ocular lesions include acute uveitis (20% of patients), episcleritis, keratitis, and corneal ulcerations. The lesions tend to recur.
- Enteric infections
- Enteric infections may trigger ReA. Pathogens include Salmonella, Shigella, Yersinia, and Campylobacter species. The frequency of ReA after these enteric infections is about 1%-4%. Other enteric bacteria that have been associated with ReA include Clostridium difficile,[13] Escherichia coli, and Helicobacter pylori.[14]
- Some patients with ReA continue with intermittent bouts of diarrhea and abdominal pain. Lesions resembling ulcerative colitis or Crohn disease have been described when ileocolonoscopy is performed in patients with established ReA.[13]
- Other manifestations
- Other manifestations of ReA include mild renal pathology with proteinuria and microhematuria.
- In severe chronic cases, amyloid deposits and immunoglobulin A (IgA) nephropathy have been reported. Cardiac conduction abnormalities may develop, and aortitis with aortic regurgitation occurs in 1%-2% of ReA cases.
Causes
ReA is usually triggered by a genitourinary or gastrointestinal infection.
Bacteria postulated to be potential causes of reactive arthritis include Ureaplasma urealyticum, C trachomatis L2b serotype,[15] beta-hemolytic streptococci,[16] and Mycobacterium tuberculosis.[17] In addition, case reports have described reactive arthritis after vaccination with live vaccines[18, 19] and after intravesical therapy with Bacillus Calmette-Guérin (BCG).[20]
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