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Shoulder instability - Coggle Diagram
Shoulder instability
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Most common nerve injury with ant dislocation:
-axillary nerve (30% incidence)
-risk of nerve injury increases with older age, duration of dislocation, and force of trauma
-traction neuropraxia is most common
-nerve originates on post cord of BP, anterior branch (humeral circumflex) wraps around humeral wall at surgical neck exposing it to trauma
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How do shape, size, and orientation of glenoid fossa affect joint stability?
-avg height is 35 mm
-avg width 25 mm
-75% of specimens retroverted 7 deg, 25% anteverted 2-10 deg
-glenoid tilted superiomedial to inferolateral avg of 15 deg
-labrum enhances depth by 50%
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dislocation after electric shock or seizure:
-can result in violent contraction of all muscle groups
-combined strength of lats, pecs, and subscap overwhelms IS/TMi which can result in post dislocation
TUBS: traumatic onset, unidirectional (ant), bankart lesion (usually present), Surgery (success rate with non-op is >20%)
AMBRI: atraumatic, multidirectional, bilateral (usually), REhab (>80% success rate), Inferior capsular shift (procedure of choice if conservative treatment fails)
ALPSA lesion: Anterior, Labroligamentous Periosteal Sleeve Avulsion
-often accompanies traumatic anterior dislocation
-characterized by labrum and periosteal sleeve of the anterior glenoid being avulsed and displaced medially
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