Calcium pyrophosphate deposition in nonhuman primates

Naturally occurring deposition of calcium pyrophosphate has been identified in six rhesus monkeys following acute episodes of trauma and various septicemias. Scanning electron microscopy with energy-dispersive X-ray analytical system and single crystal electron diffraction studies were used to identify the crystals within the articular cartilage. The osteoarthritis grading system was used to determine the degree of cartilage degenerative changes.