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[A clinical study of calcium pyrophosphate dihydrate crystal deposition disease]
Insights
Calcium pyrophosphate dihydrate crystal deposition disease (CPPD c.d.d.) affects 9.7% of older adults, often asymptomatically. Associated findings include spinal scoliosis and knee osteoarthritis-like changes.
Area of Science:
- Rheumatology
- Crystal-induced Arthropathies
- Geriatric Medicine
Background:
- Calcium pyrophosphate dihydrate crystal deposition disease (CPPD c.d.d.) is a common condition in older adults.
- Understanding the clinical manifestations and associated conditions of CPPD c.d.d. is crucial for diagnosis and management.
Purpose of the Study:
- To investigate the clinical features and prevalence of CPPD c.d.d. in an elderly population.
- To identify associated musculoskeletal abnormalities and histological characteristics of CPPD c.d.d.
Main Methods:
- Prevalence study in 300 individuals aged 50+ residing in an old-age home.
- Comparative analysis between CPPD c.d.d. patients and controls.
- Clinical and histological examination of 50 CPPD c.d.d. patients.
Main Results:
- CPPD c.d.d. prevalence was 9.7% in the studied population.
- The asymptomatic type was most common.
- Lumbar scoliosis, knee osteoarthritis-like changes, subchondral bone cysts, and patellar maltracking were more frequent in CPPD c.d.d. patients.
- Calcification extended beyond articular cartilage to periarticular tissues and ligamentum flavum.
- Histology showed destructive tissue changes around crystal deposits, initiated by chondrocyte degeneration.
Conclusions:
- CPPD c.d.d. is prevalent in the elderly, frequently asymptomatic, and associated with specific skeletal changes.
- Degenerating chondrocytes and metaplastic chondrocytes appear to initiate CPPD crystal formation.
- Further research into the pathogenesis and long-term consequences of CPPD c.d.d. is warranted.
Abstract:
Clinical features of calcium pyrophosphate dihydrate crystal deposition disease (CPPD c.d.d.) were studied and the following results were obtained. The prevalence of CPPD c.d.d. was 9.7% in 300 persons aged 50 or older, who stayed or worked at an old-age home. The most common type of CPPD c.d.d. was the asymptomatic type. Comparative studies between the patients with CPPD c.d.d. and subjects without it revealed that scoliosis of the lumbar spine, osteoarthritis-like changes of the knee, subchondral bone cyst and patella wrapped around the femur were statistically more frequent in the former. The clinical study of 50 patients with CPPD c.d.d. revealed calcification not only in the articular cartilage but also in periarticular tissues and ligamentum flavum. The histological study demonstrated frequent destructive changes of the tissues around the site of CPPD crystal deposition. Formation of CPPD crystals appeared to be initiated by degenerating chondrocytes and metaplastic chondrocytes.
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