Almost always associated with pain and restricted movement, although shoulder pain can also be caused by disorders of the heart, gall bladder or diaphragm. The most important shoulder conditions are fractures of the humerus (upper arm) or clavicle (shoulder blade). The shoulder can also be dislocated by a fall or other accident, and injuries to children can cause epiphysiolysis. Arthritis of the shoulder often occurs as a rheumatic disorder; tendon and mucous goblet cell inflammation can be associated with calcium deposits. Shoulder pain also occurs in polymyalgia rheumatica and in neuralgic pain and circulatory disorders caused by a cervical rib. Shoulder conditions can cause frozen shoulder.