Pseudogout - Symptoms, Causes, Diagnosis & Treatment

Sudden joint pain, swelling and stiffness can make everyday activities such as walking, climbing stairs or moving the hands difficult. One possible cause is pseudogout, an inflammatory joint condition associated with the accumulation of calcium pyrophosphate crystals in the joints. It commonly affects the knees, wrists, and other joints.

Understanding pseudogout symptoms, risk factors, and treatment options can help individuals seek timely medical attention. Although the condition cannot currently be cured, appropriate treatment can help manage inflammation, relieve discomfort, and improve joint function.

What Is Pseudogout?

Pseudogout is a form of acute inflammatory arthritis caused by calcium pyrophosphate crystal deposition. It occurs within the broader condition known as calcium pyrophosphate deposition disease (CPPD). It develops when calcium pyrophosphate dihydrate crystals accumulate in the cartilage and other tissues around the joints. These crystals can trigger inflammation, resulting in episodes of pain and swelling.

The term CPPD describes the underlying crystal deposition condition, while pseudogout commonly refers to episodes of acute joint inflammation caused by these crystals. Some individuals may have crystal deposits without experiencing noticeable symptoms.

The condition can affect different joints, but the knee is particularly common. Pseudogout arthritis may develop suddenly and last for several days or weeks, depending on the severity of the episode.

What Are the Symptoms of Pseudogout?

Pseudogout symptoms may appear suddenly and vary in intensity. Common signs include:

• Joint pain: Sudden or intense pain in the affected joint.
• Swelling: Visible swelling around the joint due to inflammation.
• Warmth and redness: The affected area may feel warm and appear red or discoloured.
• Stiffness: Reduced flexibility or difficulty moving the joint.
• Limited mobility: Pain may make walking, standing or performing routine activities difficult.

Symptoms can affect one or more joints. In some cases, repeated episodes may contribute to ongoing discomfort, stiffness, and joint damage.

Sudden joint pain accompanied by swelling and warmth requires prompt medical assessment because joint infections and other conditions can produce similar symptoms.

What Are the Causes of Pseudogout?

The primary cause of pseudogout is the deposition of calcium pyrophosphate crystals in and around the joints. However, the exact reason these crystals form in some people is not fully understood.

Several factors may increase the likelihood of developing CPPD, including:

• Ageing: The risk increases with age, particularly among older adults.
• Joint injury: Previous trauma or surgery may increase the risk of crystal deposition in an affected joint.
• Osteoarthritis: Existing joint degeneration is associated with CPPD.
• Metabolic conditions: Disorders such as hyperparathyroidism, haemochromatosis and low magnesium levels may be associated with crystal formation.
• Family history: Genetic factors may contribute to the condition in some families.

These factors do not mean that everyone exposed to them will develop pseudogout. A healthcare professional can assess relevant medical history and determine whether further investigations are necessary.

How Is Pseudogout Diagnosed?

Diagnosing pseudogout involves evaluating symptoms, examining the affected joint and, when necessary, performing additional tests.

Common diagnostic methods include:

• Joint fluid analysis: A healthcare professional may collect fluid from the affected joint using a needle. Laboratory examination can identify calcium pyrophosphate crystals and help distinguish pseudogout from other causes of joint inflammation.
• X-rays: Imaging may reveal calcium deposits in cartilage, a finding known as chondrocalcinosis.
• Other imaging tests: Ultrasound or other imaging methods may be used when clinically appropriate.
• Blood tests: These may help identify associated metabolic conditions or assess other possible causes of symptoms.

The presence of chondrocalcinosis on imaging does not necessarily mean that a person has symptomatic CPPD or pseudogout. Diagnosis depends on the clinical findings and relevant test results.

What Is the Difference Between Pseudogout and Gout?

Although pseudogout and gout can cause similar episodes of joint pain, they involve different types of crystals.

The differences between pseudogout and gout are important because the conditions require different management approaches. Symptoms alone may not be sufficient to distinguish them, so medical evaluation is essential.

What Is the Treatment for Pseudogout?

There is currently no treatment that removes all existing calcium pyrophosphate crystal deposits or permanently cures CPPD. However, pseudogout treatment can help control inflammation, relieve pain, and maintain joint mobility.

Depending on the individual's condition, treatment may include:

• Anti-inflammatory medicines: A healthcare professional may recommend appropriate medicines to reduce pain and swelling.
• Colchicine: This prescription medicine may be used to manage acute attacks or help prevent recurrent episodes in selected patients.
• Corticosteroids: These may be prescribed orally or injected into an affected joint to control inflammation.
• Joint fluid drainage: Removing excess fluid from a swollen joint may relieve pressure and help with diagnosis.
• Rest and cold packs: Resting the affected joint and applying a cold pack wrapped in a cloth may provide temporary relief.

Treatment depends on symptom severity, other medical conditions, and the medicines a person can safely take. Do not start anti-inflammatory medicines or other prescription treatments without appropriate medical advice.

For people with calcium pyrophosphate arthropathy, ongoing medical care may also help monitor joint function and address associated conditions.

When Should You Consult a Doctor?

Consult a healthcare professional if you experience persistent joint stiffness, recurring swelling or unexplained joint pain. Seek urgent medical assessment if a joint becomes suddenly painful, hot, and swollen, particularly when accompanied by fever or difficulty moving the joint. These symptoms may indicate an infection that requires prompt treatment.

A rheumatologist, a specialist in arthritis and other inflammatory joint conditions, may be involved in diagnosis and ongoing management.

Reader Information: This article is for informational purposes only and does not replace professional medical advice, diagnosis, or treatment. If you experience sudden joint pain, swelling, warmth, or stiffness, consult a qualified healthcare professional for appropriate evaluation and care. Seek urgent medical attention if a joint becomes hot and swollen, particularly when accompanied by fever, as a joint infection must be ruled out.