What is Pseudogout?

Pseudogout, also known as calcium pyrophosphate dihydrate (CPPD) crystal deposition disease, is a type of arthritis caused by the accumulation of calcium pyrophosphate crystals in the joints. It often mimics gout but is caused by different crystals and usually affects larger joints such as the knees or wrists.

What causes Pseudogout?

Pseudogout results from the buildup of calcium pyrophosphate crystals in the cartilage and joint fluid. The exact reason these crystals form is not always clear, but risk factors include:

• Age: More common in people over 60 years
• Joint injury or surgery
• Genetic predisposition
• Underlying medical conditions such as:
  • Osteoarthritis
  • Hyperparathyroidism
  • Hemochromatosis (iron overload)
  • Hypomagnesemia (low magnesium levels)
  • Hypophosphatasia

What are the symptoms of Pseudogout?

Symptoms can appear suddenly and may include:

• Sudden onset of joint pain, swelling, warmth, and redness
• Most commonly affects the knee, but can involve wrists, ankles, shoulders, elbows, or hips
• Joint stiffness and decreased range of motion
• Symptoms often last days to weeks
• May have recurrent episodes

In some cases, pseudogout can cause chronic joint inflammation resembling osteoarthritis.

How is Pseudogout diagnosed?

Diagnosis involves:

• Clinical examination of affected joints
• Joint fluid analysis: Removal of fluid from the joint (arthrocentesis) and examination under a microscope to identify calcium pyrophosphate crystals
• X-rays: May show calcification in the cartilage (chondrocalcinosis)
• Blood tests: To rule out other causes and check for underlying conditions

What are the treatment options for Pseudogout?

Treatment focuses on relieving symptoms and managing inflammation:

Medications:

• Nonsteroidal anti-inflammatory drugs (NSAIDs) to reduce pain and swelling
• Colchicine can help reduce inflammation and prevent flare-ups
• Corticosteroids: Injected directly into the affected joint or given orally in severe cases
• Pain relievers like acetaminophen may be used for mild pain

Other Measures:

• Resting and elevating the affected joint
• Applying ice packs to reduce swelling
• Physical therapy to maintain joint function after flare-ups

What is the prognosis for Pseudogout?

Pseudogout is a chronic condition that may have intermittent flare-ups. While it can cause joint damage over time, appropriate management often controls symptoms and improves quality of life. Some people experience only occasional attacks.

How can Pseudogout be prevented or managed long-term?

Preventive strategies include:

• Managing underlying metabolic disorders such as hyperparathyroidism or hemochromatosis
• Maintaining a healthy lifestyle and managing joint injuries carefully
• Taking medications like colchicine to prevent recurrent attacks if prescribed