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Infraspinatus, 14. Teres minor), 15. Biceps muscle. The rotator cuff (SITS muscles) is a group of muscles and their tendons that act to stabilize the human shoulder and allow for its extensive range of motion. Of the seven scapulohumeral muscles, four make up the rotator cuff. The four muscles are: supraspinatus muscle; infraspinatus muscle ...
A strain is a type of acute injury that occurs to the muscle or tendon. Similar to sprains, it can vary in severity, from a stretching of the muscle or tendon to a complete tear of the tendon from the muscle. Some of the most common places that strains occur are in the foot, back of the leg (hamstring), or back. [2]
The humeral head may migrate upward (high-riding humeral head) secondary to tears of the infraspinatus, or combined tears of the supraspinatus and infraspinatus. [51] The migration can be measured by the distance between: A line crossing the center of a line between the superior and inferior rims of the glenoid articular surface (blue in image).
The patient is asked to either sit on an examination table or stand while performing this test. Examiner should be standing on the patient's lateral side or behind the arm being evaluated. Examiner will passively abduct the patient's shoulder (humerus) to 90 degrees. The patient is then asked to slowly lower or adduct the shoulder to their side.
In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. [1] As one of the four muscles of the rotator cuff , the main function of the infraspinatus is to externally rotate the humerus and stabilize the shoulder joint.
Ultrasonography, arthrography and MRI can be used to detect rotator cuff muscle pathology. MRI is the best imaging test prior to arthroscopic surgery. [2] Due to lack of understanding of the pathoaetiology, and lack of diagnostic accuracy in the assessment process by many physicians, [19] several opinions are recommended before intervention.
The Hawkins–Kennedy Test is a test used in the evaluation of orthopedic shoulder injury. It was first described in the 1980s by Canadians R. Hawkins and J. Kennedy, and a positive test is most likely indicative of damage to the tendon of the supraspinatus muscle .
In both tests, the patient is placed in a standing or sitting position, and the arms are raised parallel to the ground in the scapular plane. [2] The tests differ in the rotation of the arm; in the empty can test, the arm is rotated to full internal rotation (thumb down) and in the full can test, the arm is rotated to 45° external rotation, thumb up. [1]