Which term indicates an accumulation of crystalline depositions in articular surfaces, bones, soft tissue, and cartilage?

Tophi is a deposition of the mono sodium urate crystals who has high level of uric acid in the blood. This conditions known as hyperuricemia.

Tophi are indication of gout. Most of the people suffering from tophi might have previous attack of arthritis which eventually leads to tophi.

This is really painful and most of the pain occurs in the joints of the body.