Shoulder Complex Flashcards
mobility and stability in shoulder girlde
is susceptible to dysfunction and instability due to competing mobility and stability demands
elevation and depression with sternoclavicular joint
Convex on concave Elevation -Superior roll, inferior glide Depression -Inferior roll, superior glide
protraction and retraction with sternoclavicular joint
Concave Convex Protraction -Anterior roll and glide Retraction -Posterior roll and glide
ant and post rotation sternoclavicular
Posterior rotation - Inferior surface turns anteriorly - Also described as backward rotation Anterior rotation - Inferior surface returns to inferior position - Minimal motion from neutral
Closed packed sternoclavicular
full posterior rotation
AC joint fx
allow scapula to rotate
osteokinematics of AC
IR/ER
ant tilt post tilt
upward downward rotaiton
ant/post tilt
maintains contact of scap on curved thorax during elevation and depression
upward downward rotation
positioning glenoid in optimal position
AC closed packed
full upward rotation
AC joint clinical for sports
commonly injured due to sloped nature
Scapulothoracic is dependent on which joints
depends on the integrity of the SC and AC joint
scapulothoracic joint osteokinematics
Elevation/depression
protraction/retraction
upward/downward rotation’
anterior/posterior tilt
internal/external rotation
GH angle of inclination
130 to 150 off frontal plane
Head to neck angle
GH angle of torsion
30 posterior off transverse plane
head twist angle
Retroversion
retroversion GH
posterior orientation of humeral head with regard to condyles
increased retroversion can lead to what
increase ER ROM and reduced IR ROM
Glenoid labrum
enhances concavity and increases articular surface
Attachment of GH ligs and tendon of long head biceps
joint capsule GH
significant lax
thicker external ligs
inferior portion is slack in AD
tight posterior GH capsule
leads to shoulder impingement
can lead to decreased subacromial space
Sup GH lig
limit ER and ant inf translation
slack when slight AB
Inf GH lig
primary active after 45 AB
AB it will resist inf ant translation
AB lat rotation it will resist anterior translation
AB with medial will resis post translation
Coracohumeral lig
limit inf translation and ER
rotator cuff main fx
protects and actively stabilizes
