Freedom of movement

    The shoulder joint has a considerable amount of freedom, giving it an extremely high level of mobility, with the aim of positioning the hand in as many sectors as possible.


    The proximal end of the humerus, known as the "head of the humerus", is part of a sphere covered by a sliding surface, the cartilage. It is articulated around the socket, a small, smooth surface in the shape of a plate on the shoulder blade.


    The active mobility of the shoulder is ensured by a set of four muscles that are inserted into the tip of the humerus, known as the rotator cuff.
    This set of muscles slides between the head of the humerus on the bottom and a bone arch known as the acromion on the top.


    The long portion of the biceps enters the joint through this set of muscles, attaching on to the shoulder blade at the top of the socket.
    As a result of trauma or degeneration, the insertion of the tendons on the rotator cuff can be ruptured, resulting in pain and a certain degree of functional impairment, which varies depending on the size of the lesion.


    Wear, or the disappearance of the cartilage is known as "osteoarthritis". This loss of the sliding action results in pain and a loss of mobility.

    The team | © 2013