Buildup of calcium phosphate in the ankle joints has been found in about 50% of the general population, and may be associated with osteoarthritis. Another common cause of<unk>  is calcium pyrophosphate dihydrate crystal deposition disease (CPPD). CPPD is estimated to affect 4% to 7% of the adult populations of Europe and the United States. Previous studies have overestimated the prevalence by simply estimating the prevalence of<unk>  regardless of cause. A magnesium deficiency may cause<unk> , and magnesium supplementation may reduce or alleviate symptoms. In some cases, arthritis from injury can cause<unk> . Other causes of<unk>  include: *Hypercalcaemia, especially when caused by hyperparathyroidism *Arthritis *Pseudogout *Wilson disease *Hemochromatosis *Ochronosis *Hypophosphatasia *Hypothyroidism *Hyperoxalemia *Acromegaly *Gitelman syndrome
Chondrocalcinosis
Calcinosis cutis
Calcinosis
Phakomatosis
Lipodermatosclerosis
Nephrocalcinosis
Silica granuloma
Papillomatosis