ABSTRACT
Crystalline calcium pyrophosphate dihydrate (CPPD) and basic calcium
phosphate (BCP) are the two most common forms of pathologic articular
mineral found in articular tissues. Each occurs frequently in patients with
osteoarthritis, and each may be phlogistic, causing acute attacks of pseudogout in
the case of CPPD crystals and acute calcific periarthritis in the case of BCP
crystals (1-3).
