Is calcific tendonitis a form of arthritis?

Is calcific tendonitis a form of arthritis?

No. Calcific tendonitis is inflammation of the tendons while arthritis is inflammation and damage of the joint itself. Calcific tendonitis may be confused with calcium pyrophosphate dihydrate deposition disease (CPPD, or pseudogout) — a type of arthritis in which calcium phosphate crystals form in the joints.