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CPPD Arthropathy: Causes, Symptoms & Treatment

CPPD arthropathy is a joint disease in which calcium pyrophosphate crystals deposit in the joint cartilage, causing inflammation, pain, and progressive joint damage.

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Things worth knowing about "CPPD arthropathy"

CPPD arthropathy is a joint disease in which calcium pyrophosphate crystals deposit in the joint cartilage, causing inflammation, pain, and progressive joint damage.

What is CPPD Arthropathy?

CPPD arthropathy (calcium pyrophosphate deposition arthropathy) is a rheumatic joint disease caused by the accumulation of calcium pyrophosphate dihydrate (CPPD) crystals within the joint cartilage and surrounding tissues. These crystal deposits can trigger inflammation, joint damage, and chronic pain. The condition predominantly affects older adults and is commonly referred to as pseudogout when it manifests as acute inflammatory flares.

Causes

The exact cause of CPPD arthropathy is not fully understood. However, several risk factors have been identified:

Age: The risk increases significantly with advancing age.
Metabolic disorders: Conditions such as hyperparathyroidism (overactive parathyroid glands), hemochromatosis (iron overload disease), hypomagnesemia (low magnesium levels), and hypothyroidism (underactive thyroid) are associated with increased risk.
Genetic predisposition: Familial forms of the disease have been documented.
Joint injuries: Previous joint trauma or surgery may predispose a joint to crystal deposition.
Gout: Co-occurrence with gout is possible.

Symptoms

CPPD arthropathy can present in several clinical forms:

Acute pseudogout: Sudden onset of severe joint pain, redness, swelling, and warmth -- resembling a gout attack. The knee joint is most commonly affected.
Chronic arthropathy: Persistent joint pain, stiffness, and reduced range of motion, similar to osteoarthritis.
Asymptomatic form: Crystal deposits without clinical symptoms, often discovered incidentally on X-ray imaging.
Pseudo-rheumatoid form: Symmetrical joint inflammation resembling rheumatoid arthritis.

Diagnosis

Diagnosis of CPPD arthropathy is based on a combination of clinical assessment and diagnostic testing:

Joint aspiration: The most important diagnostic step involves analyzing the synovial fluid under polarized light microscopy to directly identify CPPD crystals.
X-ray imaging: Typical calcifications of the joint cartilage (chondrocalcinosis) are often visible on plain radiographs.
Ultrasound and MRI: Useful for better visualization of crystal deposits and joint inflammation.
Laboratory tests: Blood tests to rule out underlying metabolic disorders (e.g., calcium, magnesium, ferritin, thyroid hormone levels).

Treatment

There is currently no treatment that reverses crystal formation. Management therefore focuses on relieving symptoms and controlling inflammation:

Acute Flare (Pseudogout)

Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or naproxen for pain relief and reduction of inflammation.
Colchicine at low doses for treatment and prevention of acute flares.
Corticosteroids (intra-articular or systemic) when NSAIDs or colchicine are contraindicated.

Chronic Disease Management

Physiotherapy to maintain joint function and strengthen surrounding muscles.
Analgesics for ongoing pain management.
Treatment of underlying metabolic disorders (e.g., correcting calcium or magnesium imbalances).
Surgical intervention (e.g., joint replacement) may be required in cases of severe joint damage.

References

Zhang W et al. - EULAR recommendations for calcium pyrophosphate deposition. Part I: terminology and diagnosis. Annals of the Rheumatic Diseases, 2011;70(4):563–570.
Rosenthal AK, Ryan LM. - Calcium Pyrophosphate Deposition Disease. New England Journal of Medicine, 2016;374(26):2575–2584.
Nevitt MC, Lane NE. - Calcium Pyrophosphate Deposition Disease. In: Firestein GS et al. (eds.) Kelley & Firestein's Textbook of Rheumatology, 10th ed. Elsevier, 2017.

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