KIN 100 Lecture Notes - Lecture 14: Sternoclavicular Joint, Acromioclavicular Joint, Joint Stability
Document Summary
Both limit the amount of elevation on the lateral end. Directed medially from the first rib to the clavicle. Aided by the pull of the anterior and posterior bundles. Increase surface of the two articulating surfaces. Disc remains stationary as elevation and depression are preformed. Assists with absorbing forces from the upper extremities. Discuss the anatomical configuration of the humerus and the glenoid fossa as they relate to glenohumeral joint stability: Motion in the plane of the scapula. Sits at 35 degrees in reference to the thorax. Flexion and extension in the plane of the scapula. Least amount of stress on the surrounding structures. What role do the glenoid labrum and joint capsule play in joint stability. Increase the surface for the head of the humerus. Increased the concave depth by 50% in the glenoid fossa. Capsule is tight superiorly and loose inferiorly. Rotation and pushes it into closed back position.
