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Kin 3K03: Sports Injuries (AC Joint & SC Joint Summary)

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Krista M Baker

Sports Injuries: Kin 3K03 AC & SC JOINTS Acromioclavicular Joint (AC) - Not too much movement Sternoclavicular Joint (SC) - Large ROM of the clavicle Muscular Supporters -trapezius (upper fibers), deltoid (anterior fibers) -rhomboids and trapezius (lower and middle) indirectly influence how the AC joint operates Coracoclavicular Ligaments - Gliding, translating, small amount of rotation in the AC joint - Joint capsule contributes to the stability but coracoclavicular ligaments are the main stabilizers - Primary stabilizers for the AC joint, binds clavicle down to the scapula AC Joint Sprain • Acute: “Separated Shoulder” o Not a dislocation, clavicle separated from scapula  Sprain o Sprain of capsule (easiest to sprain) o Sprain of ligaments (harder to fail, need more trauma) 2 Mechanisms of Injury o DIRECT  Most common way, direct physical contact to the joint (acromion and clavicle shearing on each other) o INDIRECT  FOOSH, load from the fall goes up to the AC joint Signs and Symptoms  Deformity (2 -3 degree sprain).  Step deformity = lowering of the acromion relative to the clavicle. Caused by weight of arm pulling it down and muscle guarding  Muscle guarding: upper trapezius contracts to protect the shoulder  lifts the clavicle up more  Swelling: easy to see, localized.  Bruising: can spread from shoulder down to armpit.  Get x-ray done to rule out clavicle fracture  During x-ray, they make you hold weights on the injured shoulder to see how much the clavicle and acromion separates, determining degree of sprain. Sports Injuries: Kin 3K03 AC Joint Aggravated By: o Weight of arm o ROM - Abduction + flexion of shoulder (especially > 90 degrees) - Bringing arm over the shoulder - Muscles cause scapula to superiorly rotate when you raise your arm, when scapula rotates superiorly, it will pull on the fibers of the joint that’s already injured - Cross flexion/extension… shearing between clavicle and scapula o Rockwood Classification: Independent - Only type 1 to type 3 for us - Which tissues failing and which direction clavicle moves (in severe injuries, clavicle can go inferiorly and posteriorly) - Class 1-3 Rockwood Injuries (INDEPENDENT STUDY)  Class 1  mild sprain to AC ligament, no elevation of clavicle  Class 2  ruptured AC ligament, CC ligament sprain, ruptured joint capsule, minimally detached deltoid and trapezius m
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