Ectopic calcification is a deposition of calcium salts that occurs outside of skeletal tissue in addition to normal physiologic calcification. This alteration usually occurs at tendon attachments, ligaments, vascular walls, and bone fascia of the skeleton. The precipitation of calcium ions from the skeletal system often leads to the development of osteoporosis, so some scholars advocate ectopic calcification as an indirect sign of osteoporosis. Ectopic calcification mostly occurs around large joints, such as the hip and elbow joints. It is commonly seen in patients with neurological paralysis. The predisposing factors may be neurological and bioelectrical factors. In the early stage, there is significant localized swelling and pain, and joint movement is limited. In the late stage, joint movement is limited due to bone tissue formation.