Exam 1 Flashcards
which directions does the glenoid fossa face?
lateral
superior
anterior
humeral head anatomy
convex
2-4 times bigger area than fossa
stability and mobility of the GHJ
poor stability
great mobility
glenoid labrum form and function
makes fossa 50% deeper
adds stability
where does GH capsule attach?
proximally: glenoid labrum
distally: neck of humerus
loose pack of GHJ
55 deg abduction
30 deg horizontal adduction
capsular pattern of GHJ
external rotation is more limited than abduction and flexion which is more limited than internal rotation
coracohumeral ligament is tight with
ER
flexion
extension
coracohumeral ligament resists
inferior translation of humeral head
coracoacromial ligament is tight with
abduction when insufficient slides of humeral head and superior translation
transverse humeral ligament is tight with
resisted supination and shoulder ER
superior GHL is tight with
full adduction with 0 degrees
abduction
ER
on slack at 90 degrees abduction
middle GHL is tight with
45 degrees abduction
45 degrees abduction with ER
anterior translation of humerus with EER
on slack at 90 degrees abduction
inferior GHL is tight with
90 degrees abduction
90 degrees abduction with ant and post bands and inferior capsules tight at end range ER and IR
supraspinatus provides reinforcement of what capsule
superior
infraspinatus provides reinforcement of what capsule
posterior
teres minor provides reinforcement of what capsule
posterior
subscapularis provides reinforcement of what capsule
anterior