The Critical Role of the Rotator Cuff The rotator cuff, comprising the supraspinatus, infraspinatus, teres minor, and subscapularis, acts as a dynamic stabilizer for the humeral head. This condition occurs when the tendons of the rotator cuff or the subacromial bursa are compressed between the humeral head and the acromion process of the scapula.
90 Degree Shoulder Abduction Rehabilitation Strategies
A deficiency or injury in any of these muscles can severely limit the ability to achieve or control this position, leading to pain and instability. The initial 0 to 30 degrees of abduction is primarily driven by the deltoid muscle and the rotator cuff, specifically the supraspinatus, which stabilizes the humeral head.
Active abduction assesses the client's own muscular control and range, while passive abduction, where the examiner moves the arm, helps distinguish between muscular tightness and joint capsule restrictions. The infraspinatus and teres minor externally rotate the humerus, which is necessary to clear the greater tubercle from the acromion.
90 Degree Shoulder Abduction Rehabilitation Strategies
During 90 degrees of abduction, the supraspinatus is particularly active, compressing the humeral head into the glenoid fossa to prevent superior translation. Assessing Range of Motion and Function Clinicians and fitness professionals utilize specific tests to evaluate 90 degree shoulder abduction.
More About 90 Degree shoulder abduction
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