Calcium Pyrophosphate Crystal Deposition Disorders
Summary
Calcium pyrophosphate crystal deposition disorders encompass a spectrum in which calcium pyrophosphate dihydrate crystals accumulate in synovial fluid, fibrocartilage and hyaline cartilage. Age remains the principal risk factor, with prevalence rising sharply beyond the sixth decade. Deposits provoke acute inflammatory episodes resembling gout (pseudogout), persistent arthralgia or joint degeneration. Pathogenesis involves dysregulated inorganic pyrophosphate metabolism, with contributions from genetic variants in ANKH and ENPP1, metabolic derangements such as hypomagnesaemia, and biomechanical stresses. Diagnosis relies on crystal identification in synovial aspirates and imaging detection of chondrocalcinosis. Radiography, ultrasonography and advanced spectroscopic methods permit characterisation of crystal size, composition and distribution. Current management aims to ameliorate inflammation and optimise joint function, but disease-modifying treatments are lacking. Heightened awareness of systemic associations and pharmacological triggers is driving renewed research into targeted interventions and prevention strategies globally.
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Calcium Pyrophosphate Crystal Deposition Disorders publication trend
The graph below shows the total number of articles in calcium pyrophosphate crystal deposition disorders across all publications each year (not limited to Nature Index journals).
Technical terms
Calcium pyrophosphate (CPP) crystals: microscopic bioinorganic salts composed of calcium and pyrophosphate that precipitate in joint tissues.
Chondrocalcinosis: radiographic or sonographic appearance of calcium crystal deposition within cartilage.
Pseudogout: acute inflammatory arthritis triggered by the release of CPP crystals into the joint space.
Ultrasonography: imaging technique using high‐frequency sound waves to visualise soft tissues and crystal deposits.
Raman spectroscopy: vibrational spectroscopic method for characterising molecular composition of crystal specimens.
References
- Calcium Pyrophosphate Crystal Formation and Deposition: Where Do we Stand and What Does the Future hold?. Current Rheumatology Reports (2024).
- Dose-response relationship between lower serum magnesium level and higher prevalence of knee chondrocalcinosis. Arthritis Research & Therapy (2017).
- Comparison of three imaging techniques in diagnosis of chondrocalcinosis of the knees in calcium pyrophosphate deposition disease. Rheumatology (2013).
- The association between ANKH promoter polymorphism and chondrocalcinosis is independent of age and osteoarthritis: results of a case–control study. Arthritis Research & Therapy (2014).
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