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Chondrocalcinosis: Causes, Symptoms & Treatment
Chondrocalcinosis is a joint disease in which calcium pyrophosphate crystals deposit in cartilage tissue, potentially causing pain, swelling, and inflammation.
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Chondrocalcinosis is a joint disease in which calcium pyrophosphate crystals deposit in cartilage tissue, potentially causing pain, swelling, and inflammation.
What is Chondrocalcinosis?
Chondrocalcinosis is a musculoskeletal disorder characterized by the deposition of calcium pyrophosphate dihydrate (CPPD) crystals in cartilage, joint capsules, and surrounding tissues. These crystal deposits can trigger joint inflammation, pain, and reduced mobility. The condition is also referred to as calcium pyrophosphate deposition disease (CPPD disease). On X-rays, the deposits appear as characteristic calcifications within the cartilage.
Causes
The exact causes of chondrocalcinosis are not fully understood. Several forms are distinguished:
- Idiopathic form: The most common form, with no identifiable underlying condition. It predominantly affects older individuals.
- Hereditary form: A rare, familial form with an earlier age of onset.
- Secondary form: Associated with metabolic disorders such as hyperparathyroidism (overactivity of the parathyroid glands), hemochromatosis (iron overload disorder), hypomagnesemia (low magnesium levels), hypothyroidism (underactive thyroid), or gout.
Symptoms
Chondrocalcinosis may be entirely asymptomatic or present in several clinical patterns:
- Acute pseudogout attack: Sudden, severe joint pain, swelling, redness, and warmth – most commonly affecting the knee. These episodes closely resemble gout attacks.
- Chronic arthropathy: Long-term, degenerative joint changes with persistent pain and reduced range of motion, similar to osteoarthritis.
- Asymptomatic form: Incidental finding on X-ray without any clinical symptoms.
- Pseudorheumatoid form: Chronic inflammation of multiple joints resembling rheumatoid arthritis.
Diagnosis
Diagnosis of chondrocalcinosis relies on a combination of clinical and imaging findings:
- X-ray imaging: Detection of calcifications in joint cartilage (characteristic of chondrocalcinosis), most commonly in the knee, wrist, and pubic symphysis.
- Joint aspiration (synovial fluid analysis): Examination of synovial fluid under a polarized light microscope to identify CPPD crystals.
- Ultrasound and MRI: Complementary imaging for assessing cartilage and soft tissue changes.
- Laboratory tests: Screening for secondary causes by measuring calcium, phosphate, magnesium, iron, ferritin, thyroid function, and parathyroid hormone levels.
Treatment
There is currently no treatment available that dissolves the crystal deposits. Therapy therefore focuses on relieving symptoms and managing inflammatory episodes:
Acute Treatment of Pseudogout Attacks
- Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac to reduce inflammation and relieve pain.
- Colchicine at low doses to abort acute attacks.
- Corticosteroids (systemic or intra-articular injection) when NSAIDs or colchicine are contraindicated.
- Joint aspiration to relieve pressure in cases of significant joint effusion.
Long-Term Management
- Treatment of the underlying condition in secondary chondrocalcinosis (e.g., management of hyperparathyroidism or hemochromatosis).
- Physiotherapy and joint-friendly exercise to maintain joint function.
- Low-dose colchicine for prevention of recurrent attacks.
Prognosis
Chondrocalcinosis typically follows a chronic course with recurring inflammatory episodes and progressive joint changes. However, early diagnosis and consistent management can significantly improve quality of life and slow the progression of joint damage.
References
- Richette P. et al. - Calcium pyrophosphate deposition disease. In: Lancet 2017; 390(10093):501-512.
- Zhang W. et al. - EULAR recommendations for calcium pyrophosphate deposition. In: Annals of the Rheumatic Diseases 2011; 70(4):563-570.
- Rosenthal A.K., Ryan L.M. - Calcium Pyrophosphate Deposition Disease. In: New England Journal of Medicine 2016; 374(26):2575-2584.
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