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The scapula plays an important role in shoulder impingement syndrome. [8] It is a wide, flat bone lying on the posterior thoracic wall that provides an attachment for three different groups of muscles. The intrinsic muscles of the scapula include the muscles of the rotator cuff- the subscapularis, infraspinatus, teres minor and supraspinatus. [9]
Muscle groups such as serratus anterior, trapezius, and rhomboid major/minor need to be strengthened to allow for shoulder function. By stabilizing these muscles there is more alignment which causes a reduction in strain and protects the joints. Glenohumeral exercises are focused around strengthening the rotator cuff muscles.
In a typical case of a dislocated shoulder, a strong force that pulls the shoulder outward (abduction) or extreme rotation of the joint pops the ball of the humerus out of the shoulder socket. Dislocation commonly occurs when there is a backward pull on the arm that either catches the muscles unprepared to resist or overwhelms the muscles.
There are many reasons why we get shoulder pain and there’s a good explanation why it can move around and appear in so many places. It’s the most mobile joint in your body, which lends itself ...
Spastic hypertonia involves uncontrollable muscle spasms, stiffening or straightening out of muscles, shock-like contractions of all or part of a group of muscles, and abnormal muscle tone. It is seen in disorders such as cerebral palsy, stroke, and spinal cord injury. Rigidity is a severe state of hypertonia where muscle resistance occurs ...
Muscle stiffness and contraction can cause abnormal resting postures. Around 70% of those with SPS have the "classic" form of the disease. [5] People with classic SPS typically first experience intermittent tightness or aching in the muscles of the trunk. [6] These muscles repeatedly and involuntarily contract, causing them to grow and rigidify ...
Individual muscles can weaken while adjacent muscles remain strong. [83] The right shoulder and arm muscles are more often affected than the left upper extremity muscles, a pattern also seen in Poland syndrome and hereditary neuralgic amyotrophy; this could reflect a genetic, developmental/anatomic, or functional-related mechanism.
Subacromial bursitis is a condition caused by inflammation of the bursa that separates the superior surface of the supraspinatus tendon (one of the four tendons of the rotator cuff) from the overlying coraco-acromial ligament, acromion, and coracoid (the acromial arch) and from the deep surface of the deltoid muscle. [1]