الفهرس 
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Abstract
Inflammation of the tendon of the supraspinatus muscle leads to supraspinatus tendinitis. This is the most common cause of shoulder pain. Supraspinatus tendinitis is often associated with Subacromial Impingement Syndrome. (Chang, 2004)
The rotator cuff provides dynamic stability by compressing the humeral head within the concave glenoid fossa during upper extremity motion, which is critical to normal functional activities (Wilk et al.,1993). Any pathologic condition of the rotator cuff may affect the ability of the rotator cuff to provide this pressive force, resulting in superior humeral head migration and potential impingement against the acromion (Juul, Kristensen et al.,2000).
Shoulder impingement syndrome has been defined as compression and mechanical abrasion of the rotator cuff structures as they pass beneath the coracoacromial arch during elevation of the arm (Neer, 1983 and Matsen & Arntz, 1990).
Therefore, a rehabilitation program designed to optimize rotator cuff strength is vital for the patient to regain normal functional activities.
Researchers disagree about the optimal exercises to strengthen the supraspinatus muscle. In several electromyographic (EMG) studies, Investigators have attempted to quantify the amount of supraspinatus EMG activity during various exercises along with specific exercise positions in asymptomatic individuals. But no researches was done in symptomatic patients.
The aim of our study was to detect activity of supraspinatus during different movements to recommend best exercises for supraspinatus to be used in rehabilitation program for supraspinatus for better biomechanics of the shoulder.
This study included 20 patients suffering from dominant shoulder pain attending the outpatient clinic of Physical Medicine, Rheumatology and Rehabilitation Department of Ain Shams University Hospitals and 10 normal persons served as a control group.
History taking and clinical examination was done, Patients were evaluated by diagnostic ultrasound in neutral position, during abduction, and during full can and empty can movements, the supraspinatus muscle tendon was observed during movement for impingement.
Electromyographic analysis of suprasinatus and middle deltoid muscles activity was conducted during common rehabilitation exercises (full can and empty can) by using 4 channels electromyography instrument.
a) Dynamic ultrasound performed during full can and empty can movements showed that the supraspinatus tendon was markedly impinged during the empty can movement compared with the full can movement.
b)There was no statistically significant difference in supraspinatus muscle EMG activity in both full can and empty can movements among patients and controls groups.
c)There was highly statistically significant increase in deltoid muscle EMG activity in empty can than full can movement among patients and control group.