Kinesiology 2236A/B Lecture Notes - Lecture 11: Medical Emergency, Upper Extremity Of Humerus, Serratus Anterior Muscle

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2236A/B
• Professor: Dave Humphreys

Document Summary

Full of complex joints (starting at sc and moving laterally) 70% of injuries happen in the upper extremity. As arm moves through flexion and/or abduction the clavicle retracts, elevates and rotates posteriorly. Motor vehicle accidents and sport injuries are most common cause of injuries. Can be: direct- blow to clavicle o. Subclavian vein and artery, trachea, esophagus o: medical emergency. Anterior dislocations rarely occur as a result of direct trauma. Occurs when an anterolateral force is applied to the clavicle and the shoulder is rolled backward. In three separate studies looking at sc joint dislocations, an indirect force was the most common mechanism of injury. Anterior injuries reduced with lateral traction: clavicle now sitting across the front, lie on back, put a force across and out to the side, pulling it back to where its suppose to be. High incidence of re-injury: unstable joint o. Functions to protect neurovascular bundle (brachial plexus), for muscle attachment and bony attachment of shoulder.