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Shoulder Complex
shoulder ligaments and joints
| Question | Answer |
|---|---|
| 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