This injury was reported as a shoulder subluxation (a partial dislocation of
the head of the humerus which comes back into place on it's own), which is not something that deals with the AC ligament.
When he checked the clinical literature, the break looked like a dead ringer for a so - called «four - part proximal humeral fracture» — a characteristic shoulder bone fracture in which the shoulder blade smashes like an anvil into
the head of the humerus, driving it forcefully into the long bone.
This muscle runs from your clavicle, manubrium which is the top part of the sternum, the upper costal cartridges and the upper area of the external obliques to
the head of the humerus of your upper arm next to the shoulder joint.
Lying on your side with your arm overstretched forward causes
the head of your humerus bone to fall forwards, overstretching and compressing the tendons of the rotator cuff muscles.
A posterior shoulder dislocation occurs when
the head of the humerus moves backwards out of the socket.
On the above image, Delavier's finger is pointing at the insertion of the long head on the scapula, above
the head of the humerus.
Your pectoralis major is a thick, palm - shaped muscle that attaches to
the head of the humerus bones on either side of the body.
It is important in throwing motions to control any forward motion of
the head of humerus.
Its main function is to stabilise the upper arm by holding
the head of the humerus in position.
This mobility exercise doesn't bring the shoulder through a full range of motion, but it stretches the ligament by distracting
the head of the humerus (upper arm bone) from the joint capsule.
Shoulder dislocations occur when
the head of the humerus bone pops out of the shoulder joint.
Its main function is to assist in abducting the humerus and to hold
the head of the humerus in the glenoid fossa.
It assists in stabilizing
the head of the humerus in the glenoid cavity while the arm is elevated.
It assists in stabilizing
the head of the humerus in the glenoid cavity while the arm is elevated; the superior fibers aid in abduction, and the inferior fibers in adduction.
The rotator cuff is a group of tiny muscles that hold
the head of the humerus in its socket, ie.
Soft shoulders are passively shrugged shoulders, where
the head of the humerus isn't «packed» and centered in the shoulder socket.
X-rays of shoulder OCD will show flattening of
the head of the humerus.