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Shoulder Complex

shoulder ligaments and joints

QuestionAnswer
Scapulothoracic Formed by the relevant bones & the muscles that attach to both scapula & thoracic skeleton
Sternoclavicular Checks med. clavicular dislocation, Serves as a pivot point for SC motion, "Base of Operation" joining the UE to axial skeleton, while contributing to mobility & withstanding imposed stresses
Acromioclavicular maintain the relation b/n clavicle & scapula in the early stages of elevation of the UE & to allow the scapula additional range of rotation on the thorax in the latter stages of limb elevation
Glenohumeral Closed packed position: ABd & ER, Capsule fibers twists & tightens
Scapular winging occurs as scapula moves around thoracic cage about a vertical axis (ABd / protraction)
Tipping must occur for the scapula to maintain contact w/rib cage during elevation or depression of scapula
Ant & Post Sternoclavicular lig. Anterior checks ant. mov’t of medial clavicle, Posterior checks post. mov’t, assist in preventing upward displacement of medial clavicle
Costoclavicular (rhomboid) lig. main check for elevation of lateral clavicle & superior glide of medial clavicle during elevation
Interclavicular lig. checks inferior glide, lateral displacement & depression of clavicle (protects vital structures)
Acromioclavicular lig. fairly weak; strengthens capsule superiorly
Coracoclavicular lig. Prevents superior dislocation & check depression & downward rotation of scapula
Coracohumeral lig. may prevent inferior subluxation of humeral head and limits ER in 0-60° of ABduction
Transverse Humeral lig. Converts groove into a canal for biceps L.H. Holds biceps L.H. tendon & sheath in place
Glenohumeral lig. stretched in anatomical position, prevents subluxation of humeral head in this position,stabilizes jt anteriorly, limits ER & anterior translation when arm b/n 0-90° of ABd.,most important static restraint
Created by: apage
 

 



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