Kinesiology 3336A/B Lecture Notes - Lecture 13: Humerus, Trapezius Muscle, Joint Stability
9 Mar 2017
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Joe is a 45 yo recreational tennis player. Has been having posterior shoulder pain with serving. Also sore when he plays catch with his kids. Feels okay doing his heavy assembly line job all day. Shoulder complex: consists of humerus, scapula (glenohumeral joint) articulation through the ac and sc joints, anytime we move our arm, there will be movement of the glenohumeral, ac and sc joints. They work together: all must work together with musculature to maintain the. Instantaneous center of motion (icom) and the gh joint: bony structures keep articulation in contact, rotator cuff muscles- compress and centralize humeral head, scapular stabilizers help position for maximal stability. If there is breakdown of any of these, there will be pathology. Pathology disruption one or more components of the complex = altered icom: result: pain / dysfunction. Dynamic: scapular stabilizers, rotator cuff, upper trapezius, lower trapezius, serratus anterior, biceps, latissimus dorsi, rhomboids, middle trapezius, levator scapula, deltoid.
