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Dactylitis: Causes, Symptoms & Treatment

Dactylitis is an inflammation of an entire finger or toe, causing painful sausage-like swelling. It commonly occurs in rheumatic diseases or infections.

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Things worth knowing about "Dactylitis"

Dactylitis is an inflammation of an entire finger or toe, causing painful sausage-like swelling. It commonly occurs in rheumatic diseases or infections.

What is Dactylitis?

Dactylitis refers to diffuse inflammatory swelling affecting an entire finger or toe, from the base to the tip. The term derives from the Greek word daktylos, meaning finger. Because of its characteristic appearance, dactylitis is often referred to clinically as a sausage digit. Unlike simple joint swelling, dactylitis involves the soft tissue structures throughout the entire digit, including the tendon sheaths, subcutaneous tissue, and skin.

Causes

Dactylitis can result from a variety of underlying conditions. The most common causes include:

Rheumatic diseases: Dactylitis is a hallmark feature of psoriatic arthritis, a joint disease associated with psoriasis. It also occurs in reactive arthritis and other forms of spondyloarthropathy.
Sickle cell disease: In young children, dactylitis may be the first sign of sickle cell disease, caused by vaso-occlusion in the small bones of the hands and feet.
Infections: Bacterial pathogens such as Staphylococcus aureus or Streptococcus pyogenes can cause infectious dactylitis, particularly in children.
Tuberculosis: In rare cases, Mycobacterium tuberculosis can infect the small bones of the fingers or toes, a condition known as spina ventosa.
Sarcoidosis: This systemic granulomatous disease can occasionally present with dactylitis.

Symptoms

The hallmark symptom of dactylitis is a diffuse, sausage-shaped swelling of one or more fingers or toes. Additional symptoms may include:

Redness and warmth over the affected digit
Pain, especially with movement or pressure
Reduced range of motion in the affected finger or toe
In infectious dactylitis: fever and general malaise may be present

The swelling typically extends along the entire length of the digit and is visually distinct from isolated joint swelling.

Diagnosis

Dactylitis is primarily diagnosed through clinical examination. Supporting investigations may include:

Blood tests: Inflammatory markers (CRP, ESR), complete blood count, and specific markers such as rheumatoid factor, anti-CCP antibodies, or HLA-B27 typing.
Imaging: X-rays, ultrasound, or MRI can visualize tendon sheath inflammation, bone changes, and the extent of tissue involvement.
Microbiological testing: If an infectious cause is suspected, swabs or blood cultures are taken to identify the responsible pathogen.

Treatment

Treatment of dactylitis depends on the underlying cause:

Rheumatic dactylitis: Nonsteroidal anti-inflammatory drugs (NSAIDs), corticosteroids (including local injections), and in severe cases, biologics or disease-modifying antirheumatic drugs (DMARDs).
Sickle cell disease: Pain management, hydration, and disease-specific hematological therapy as needed.
Infectious dactylitis: Targeted antibiotic or antifungal therapy based on the identified pathogen.
Physiotherapy: To maintain joint mobility and prevent long-term functional impairment.

Early diagnosis and appropriate treatment are essential to prevent permanent damage to the affected digits.

References

Olivieri I. et al. - Dactylitis: A term for different digit diseases. Scandinavian Journal of Rheumatology, 2006; 35(5): 333-340.
Brockbank J., Gladman D. - Diagnosis and management of psoriatic arthritis. Drugs, 2002; 62(17): 2447-2457.
World Health Organization (WHO) - Sickle-cell disease and other haemoglobin disorders. Fact Sheet, 2023. Available at: https://www.who.int

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