Fractured arm. Frontal X-ray of a patient with a fracture (lower centre) of the upper arm bone (humerus). At left is the side of the rib cage and at top is the shoulder, where the humerus articulates with the shoulder blade (scapula), in a ball and socket joint. The bone will be immobilised, either externally, using a cast, or internally, using metal pins, to allow it to heal.
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