Calcified shoulder joint. Coloured X-ray of a calcified shoulder joint. There is a deposit of calcium at the top right of the shoulder joint. At right is the humerus (upper arm bone), which joins with the scapula (shoulder blade) at upper right. At top left is the clavicle (collarbone). The majority of calcium (99%) is usually deposited in the teeth and bones, with the remainder dissolving in the blood. However, metabolic or hormonal disturbances, or injury, can cause calcium to be deposited elsewhere in the body.