Kinesiology 2230A/B Lecture Notes - Lecture 12: Subscapularis Muscle, Upper Extremity Of Humerus, Subacromial Bursa
28 Feb 2016
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Document Summary
Feel pain when contracting pain with stretch and contraction. Raise arms above head and then slowly lower, if tear, the patient cannot hold arm at 90 degrees and arm will drop. Supraspinatus tear raise arm and slowly lower to 90 degrees, cannot hold at. Not a true strain or tear, it is tendinosis because it is over time. Over wear and tear it finally splits. Weakness of rotator cuff muscles reduces the effectiveness of centralization of the humeral head. With impingement the humerus is pulled too far up and pinches the supraspinatus or sub-acromial bursa. The causes pain during rom between 70-120 degrees. Issue of muscle imbalance deltoid too strong and rotator cuff too weak. Painful arc at 70 degrees 120 degrees. Diffuse pain around acromion and over deltoid. Supraspinatus refers pain into the deltoid - displacement. Signs: easy to test hard to fix. Poor joint stability usually anterior humeral head.
