The labrum is  the articular surface (the area where the ball of the arm bone or humerus connects to the actual joint surface or glenoid cavity *the socket of the shoulder).   Its like looking at the Universal Joint on a car crankshaft.  The surface on the inside of the socket is where the labrum forms a secure ‘cuff’ for the bony humerus to insert into.  Like a ring of fibre that makes the articulation more secure, it helps to create a deeper rim.  Like the rubber ring on a preserving jar.

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AuthorPeter Furness
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often, as a therapist, working along lines of movement that influence the shoulder itself is where we can reinforce efficient and better technique in the movement of the joint and ensure healthy and functional operation.  These 'secondary movers' are also advantageous when you are in the middle stage of rehabilitation where acute pain is donwgraded, but functional movement is still restricted.  Detailed work here can contribute to effective bio-mechanics of the joint for future pain free movement.