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Enthesitis – Causes, Symptoms & Treatment

Enthesitis is an inflammation of the enthesis, the site where tendons or ligaments attach to bone. It is commonly associated with rheumatic diseases and causes pain and stiffness.

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Things worth knowing about "Enthesitis"

Enthesitis is an inflammation of the enthesis, the site where tendons or ligaments attach to bone. It is commonly associated with rheumatic diseases and causes pain and stiffness.

What Is Enthesitis?

Enthesitis refers to inflammation of the enthesis – the anatomical region where tendons, ligaments, or joint capsules attach to bone. These transition zones are particularly susceptible to mechanical stress and immune-mediated inflammatory reactions. Enthesitis can affect one or multiple sites simultaneously and is a hallmark feature of several rheumatic conditions, particularly the spondyloarthropathies.

Causes

Enthesitis can arise from several different mechanisms:

Autoimmune conditions: Spondyloarthritides such as ankylosing spondylitis, psoriatic arthritis, and reactive arthritis are among the most common underlying causes.
Mechanical overuse: Repetitive strain on tendon insertion sites, for example during sports or physical labor, can trigger local inflammation.
Infections: Certain bacterial infections may provoke reactive enthesitis.
Psoriasis: Enthesitis frequently accompanies psoriatic skin disease, even in the absence of frank arthritis.

Symptoms

The typical symptoms of enthesitis include:

Localized pain at tendon insertion sites, often worsened by pressure or movement
Swelling and local warmth over the affected area
Morning stiffness or stiffness after periods of inactivity
Restricted range of motion in the surrounding joint

Commonly affected sites include the Achilles tendon insertion, the plantar fascia (sole of the foot), the patellar tendon insertion, and attachment sites along the spine and pelvis.

Diagnosis

Enthesitis is diagnosed through a combination of:

Clinical examination: Tenderness on palpation at characteristic entheseal sites
Imaging: Ultrasound can reveal thickening, calcifications, and abnormal blood flow; MRI provides detailed visualization of soft tissue inflammation
Laboratory tests: Inflammatory markers such as CRP and ESR may be elevated; HLA-B27 testing is relevant when spondyloarthritis is suspected
Medical history: Questions regarding associated conditions such as psoriasis, inflammatory bowel disease, or prior infections

Treatment

Treatment is tailored to the underlying cause and severity of inflammation:

Pharmacological Treatment

NSAIDs (nonsteroidal anti-inflammatory drugs) such as ibuprofen or naproxen for pain relief and reduction of inflammation
Local corticosteroid injections at the affected enthesis in cases of severe symptoms
Biologics (e.g., TNF inhibitors, IL-17 inhibitors) for enthesitis associated with spondyloarthritis or psoriatic arthritis
DMARDs (disease-modifying antirheumatic drugs) for specific underlying conditions

Physical Therapy

Physiotherapy to restore mobility and strengthen the surrounding musculature
Extracorporeal shock wave therapy (ESWT) for chronic enthesitis, particularly at the Achilles tendon
Orthotic devices (e.g., insoles) to offload affected insertion sites

General Measures

Rest during acute flares
Gradual return to physical activity
Weight management to reduce mechanical load on entheseal regions

References

Rudwaleit M. et al. - The Assessment of SpondyloArthritis International Society (ASAS) classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general. Annals of the Rheumatic Diseases, 2011.
Mease P.J. - Enthesitis in psoriatic arthritis pathophysiology, assessment, and treatment. Drugs, 2014.
Sieper J. et al. - Axial spondyloarthritis. Nature Reviews Disease Primers, 2015.

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