- Inflammatory arthritis due to deposition of pyrophosphate crystals, associated with OA, hyperparathyroidism, and haemochromatosis.
- P/c: less severe than gout, difficult to differentiate from other athritides. Knee, wrist, shoulder affected, maybe triggered by inter-current illness, and metabolic disturbance.
- Ix: chondrocalcinosis maybe seen on Xray (calcification of articular cartilage), joint crystals present.
- Mx: tx like acute gout. Consider referral to rheum for DMARDs.