Peripheral Arthritis

Classification and Characteristics

Peripheral arthritis can be classified into different types based on the pattern of joint involvement, duration, and relationship to underlying conditions, affecting limb joints and characterized by pain, swelling, and stiffness 1
Pauciarticular peripheral arthritis affects fewer than 5 joints, predominantly affects large weight-bearing joints of the lower limbs, has an asymmetrical distribution, is acute and self-limiting, and does not cause permanent joint damage, with symptoms correlating with underlying inflammatory bowel disease (IBD) flares 2, 3, 4, 5
Polyarticular peripheral arthritis affects more than 5 joints, predominantly affects upper limbs, has a symmetrical distribution, and has persistent symptoms lasting months or years, independent of IBD activity, and can lead to more persistent problems 2, 3, 4, 5

Diagnosis of peripheral arthritis is primarily clinical, based on joint pain with evidence of swelling or effusion, pattern of joint involvement, relationship to underlying conditions, morning stiffness, and absence of deformity on imaging 1
Key diagnostic features include non-erosive nature on radiographs, absence of specific laboratory markers, and consideration of all possible causes 1
Investigations such as ESR and CRP, RF and/or ACPA testing, X-rays of affected joints, and HLA-B27 testing should be considered 1
Imaging methods include radiography, MRI, ultrasound, and CT, with MRI being the gold standard for early detection of sacroiliitis and inflammatory changes 2, 6
Laboratory tests include inflammatory markers, autoimmune panels, and HLA-B27 testing for suspected axial spondyloarthropathy 2, 4, 6

Peripheral arthritis commonly occurs in association with inflammatory bowel disease, psoriatic arthritis, ankylosing spondylitis, reactive arthritis, and undifferentiated spondyloarthritis 1
The prognosis of peripheral arthritis is generally good, with most cases not becoming chronic or erosive, and regular monitoring of disease activity is recommended 1
Predictors of persistent inflammatory arthritis include disease duration, morning stiffness, functional impairment, involvement of small joints, and presence of radiographic erosions 1

Treatment depends on the type of peripheral arthritis and may include treatment of underlying condition, rest and physiotherapy, simple analgesia, short-term NSAIDs, and local steroid injections 1, 3, 4
Rheumatology referral, NSAIDs or systemic corticosteroids, and disease-modifying antirheumatic drugs (DMARDs) may be necessary for persistent or refractory cases 1, 3, 4
The American Gastroenterological Association recommends caution when prescribing NSAIDs to patients with IBD, due to the potential risk of aggravating underlying IBD, although this risk appears low when prescribed at low doses and for short durations 4
The European League Against Rheumatism recommends early rheumatology referral for patients with persistent peripheral arthritis, and suggests that sulfasalazine, methotrexate, and azathioprine are generally ineffective for axial symptoms 4, 5
Treatment of Type I Peripheral Arthropathy involves treatment of underlying IBD, rest, physiotherapy, simple analgesia, short-term NSAIDs, and local steroid injections for persistent symptoms 3, 4
Treatment of Type II Peripheral Arthropathy requires rheumatology referral, NSAIDs or systemic corticosteroids, sulfasalazine, and immunomodulators or anti-TNF therapy for refractory cases 3, 4
Treatment of Axial Arthropathy involves intensive physiotherapy, short-term NSAIDs, and anti-TNF therapy for patients intolerant or refractory to NSAIDs 4, 5

Patients with inflammatory arthritis should be monitored with serial rheumatologic examinations and inflammatory markers every 4-6 weeks after treatment initiation 7
Early diagnosis of axial spondyloarthropathy is vital to prevent long-term disability, and can be suspected in young people with low back pain, pain lasting more than 3 months, and morning stiffness lasting more than 30 minutes 3
MRI is recommended for early detection of sacroiliitis in symptomatic patients with normal plain radiography (non-radiographic SpA) 2