Calcium pyrophosphate arthropathy is associated with various clinical scenarios and can mimic other conditions. Investigation requires consideration of life-threatening alternative diagnoses.
Calcium pyrophosphate (CPP) crystals are frequently present in joints, particularly in the elderly, and are associated with several different clinical scenarios including acute CPP crystal arthritis, osteoarthritis with CPP deposition and chronic CPP crystal inflammatory arthritis. The various types of presentation potentially mimic other conditions. The nomenclature in this article is as recommended by EULAR (European League Against Rheumatism).1 Chondrocalcinosis is a radiological finding of calcification within cartilage that is most commonly caused by CPP crystal deposition.1,2