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Synovitis: Causes, Symptoms & Treatment

Synovitis is an inflammation of the synovial membrane lining the joints, causing pain, swelling, and restricted movement.

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Things worth knowing about "Synovitis"

Synovitis is an inflammation of the synovial membrane lining the joints, causing pain, swelling, and restricted movement.

What is Synovitis?

Synovitis (also referred to as synovialitis) is an inflammation of the synovial membrane – the thin tissue layer that lines the inside of a joint capsule. This membrane normally produces synovial fluid, which lubricates and nourishes the joint. When inflamed, it produces excess fluid, leading to joint swelling, pain, and reduced mobility. Synovitis can affect any joint in the body, but most commonly involves the knee, hip, shoulder, wrist, and finger joints.

Causes

Synovitis can be triggered by a variety of conditions:

Rheumatic and autoimmune diseases: Rheumatoid arthritis, psoriatic arthritis, systemic lupus erythematosus, and other autoimmune disorders are among the most common causes of chronic synovitis.
Infections: Bacteria, viruses, or fungi can directly infect the synovial membrane, causing septic or infectious synovitis, a medical emergency requiring prompt treatment.
Trauma and overuse: Joint injuries, repetitive mechanical stress, or overloading can trigger a reactive synovitis.
Metabolic disorders: Gout (caused by uric acid crystal deposits) and pseudogout (calcium pyrophosphate crystal deposits) irritate the synovial membrane and provoke inflammation.
Idiopathic (transient) synovitis: Especially common in children, transient synovitis of the hip (also called coxitis fugax) is a self-limiting condition without a clearly identified cause.

Symptoms

The symptoms of synovitis may vary depending on the underlying cause and the affected joint. Common signs include:

Joint swelling due to the accumulation of excess synovial fluid (joint effusion)
Pain in the affected joint, often present even at rest
Warmth and redness over the joint
Stiffness and limited range of motion, particularly in the morning
Fever and general malaise in cases of infectious synovitis

Diagnosis

The diagnosis of synovitis is based on a combination of clinical and diagnostic assessments:

Physical examination: The physician assesses the joint for swelling, warmth, tenderness, and range of motion.
Blood tests: Inflammatory markers such as CRP (C-reactive protein) and ESR (erythrocyte sedimentation rate), as well as specific antibodies (e.g., rheumatoid factor, anti-CCP), may be elevated.
Imaging: Ultrasound and MRI (magnetic resonance imaging) are highly sensitive tools for detecting synovitis early and assessing the extent of inflammation. X-rays may show secondary changes in chronic cases.
Joint aspiration: Synovial fluid can be withdrawn and analyzed when infection or crystal-induced arthritis is suspected.
Synovial biopsy: In select cases, a tissue sample from the synovial membrane may be required for a definitive diagnosis.

Treatment

Treatment is directed at the underlying cause of synovitis and aims to reduce inflammation, relieve pain, and preserve joint function.

Medication-based Treatment

NSAIDs (Non-steroidal anti-inflammatory drugs): Medications such as ibuprofen or diclofenac reduce pain and inflammation effectively in mild to moderate cases.
Corticosteroids: Cortisone can be administered systemically (orally or intravenously) or locally via intra-articular injection for rapid inflammation control.
DMARDs (Disease-modifying antirheumatic drugs): In autoimmune-related synovitis, medications such as methotrexate or biologics are used for long-term disease management.
Antibiotics: Infectious synovitis requires targeted antibiotic therapy, often administered intravenously in hospital settings.

Non-medication-based Treatment

Rest and joint protection during the acute phase to reduce mechanical stress
Physiotherapy to restore mobility and strengthen surrounding muscles after the inflammation subsides
Cold therapy (ice packs) to reduce pain and swelling
Joint aspiration to relieve pressure caused by large effusions

Surgical Treatment

In chronic or refractory cases, a synovectomy – the surgical or arthroscopic removal of the inflamed synovial membrane – may be performed to provide long-term relief and prevent further joint damage.

Prognosis

The prognosis depends largely on the underlying cause. Transient synovitis in children typically resolves completely within a few weeks without lasting complications. Infectious synovitis requires urgent treatment to prevent permanent joint damage. Chronic synovitis associated with autoimmune diseases requires ongoing management to slow joint deterioration and preserve quality of life.

References

Firestein G.S. et al.: Kelley's & Firestein's Textbook of Rheumatology, 10th edition, Elsevier, 2017.
Colebatch A.N. et al.: EULAR recommendations for the use of imaging in the clinical management of peripheral joint osteoarthritis. Annals of the Rheumatic Diseases, 2013; 72(6): 804–814.
Mathews C.J., Kingsley G., Field M. et al.: Management of septic arthritis: a systematic review. Annals of the Rheumatic Diseases, 2007; 66(4): 440–445.

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