Artificial shoulder. Coloured X-ray of an artificial (prosthetic) shoulder joint in a 74 year old patient. The prosthesis is anchored in the humerus (upper arm bone) and covers its head. The humerus articulates with the clavicle (collar bone, top right) and the scapula (shoulder blade, below clavicle) to form the shoulder joint. Joints may need to be replaced due to injury or disease, such as arthritis.
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