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Monoarthritis: Causes, Symptoms & Treatment

Monoarthritis is an inflammation affecting a single joint. It can occur acutely or chronically and has various causes including infections, gout, or trauma.

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Things worth knowing about "Monoarthritis"

Monoarthritis is an inflammation affecting a single joint. It can occur acutely or chronically and has various causes including infections, gout, or trauma.

What is Monoarthritis?

Monoarthritis refers to the inflammation of a single joint. Unlike polyarthritis, which involves multiple joints simultaneously, monoarthritis is confined to one joint area. It can develop suddenly (acute) or gradually over time (chronic) and commonly affects large joints such as the knee, hip, ankle, or wrist.

Causes

Monoarthritis can have a wide range of underlying causes. The most common include:

Infectious (septic) arthritis: Bacteria, viruses, or fungi enter the joint through the bloodstream or a wound, triggering inflammation. Common pathogens include Staphylococcus aureus and Neisseria gonorrhoeae.
Crystal arthropathies: Deposits of uric acid crystals (gout) or calcium pyrophosphate crystals (pseudogout) in the joint cause intense inflammatory reactions.
Traumatic causes: Injuries, contusions, or overuse can provoke a reactive joint inflammation.
Reactive arthritis: An infection elsewhere in the body (e.g., urinary tract or gastrointestinal tract) triggers an immune response that affects the joint.
Early-stage systemic disease: Rheumatoid arthritis, psoriatic arthritis, or ankylosing spondylitis may begin as monoarthritis in the early stages.
Osteoarthritis: Degenerative changes in a single joint can produce signs of inflammation.

Symptoms

The characteristic symptoms of monoarthritis include:

Pain in the affected joint, both at rest and during movement
Swelling and visible enlargement of the joint
Redness of the skin over the joint
Warmth around the joint area
Limited range of motion and joint stiffness
In cases of infectious origin: fever, chills, and general malaise

Diagnosis

Diagnosing monoarthritis requires careful evaluation, as the treatment depends heavily on the underlying cause. The following diagnostic steps are commonly used:

Physical Examination

The physician examines the joint for swelling, redness, warmth, and range of motion.

Laboratory Tests

Blood tests measuring inflammatory markers such as CRP (C-reactive protein), ESR (erythrocyte sedimentation rate), blood count, uric acid levels, and infection markers help narrow down the cause.

Joint Aspiration (Arthrocentesis)

If infectious arthritis or a crystal arthropathy is suspected, joint fluid (synovial fluid) is aspirated and analysed in the laboratory. This is a critical diagnostic step that can confirm the diagnosis.

Imaging

X-rays, ultrasound, or MRI can visualise joint changes, bone damage, or fluid accumulation within the joint.

Treatment

The treatment of monoarthritis is directed at the underlying cause:

Infectious Arthritis

A bacterial joint infection is treated with antibiotics, often administered intravenously in a hospital setting. Joint irrigation or surgical intervention may be required to remove pus and bacteria.

Gout and Crystal Arthropathies

Acute gout attacks are treated with non-steroidal anti-inflammatory drugs (NSAIDs), colchicine, or corticosteroids. Long-term management includes urate-lowering therapy such as allopurinol.

Reactive Arthritis

Anti-inflammatory medications (NSAIDs) and, where appropriate, treatment of the underlying infection are the primary approaches.

Symptomatic Treatment

Regardless of the cause, management includes pain relief, immobilisation of the joint during the acute phase, and targeted physiotherapy to restore mobility.

When to See a Doctor?

Acute monoarthritis should always be promptly evaluated by a physician. Immediate medical attention is particularly important when:

Sudden onset of severe joint pain and swelling occurs
Fever or chills accompany the joint symptoms
Significant limitation of movement is present
The patient has pre-existing conditions such as diabetes or a weakened immune system

Untreated septic arthritis can cause permanent joint damage within hours to days and must be treated as a medical emergency.

References

Coakley G. et al. - BSR & BHPR, BOA, RCGP and BSAC guidelines for management of the hot swollen joint in adults. Rheumatology (Oxford), 2006; 45(8): 1039-1041.
Goldenberg D.L. - Septic arthritis. The Lancet, 1998; 351(9097): 197-202.
Richette P., Bardin T. - Gout. The Lancet, 2010; 375(9711): 318-328.

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