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Biomechanics

shoulder

QuestionAnswer
Where do most dislocations occur in GH joint? Anterior, since there is more stability on glenoid from top to bottom.
Which shoulder muscles are SPINO-SCAPULAR? Rhomboids, Traps, Levator, (Latiss. Dorsi)
Which shoulder muscles are SPINO-HUMERAL? Latissimus Dorsi
Which shoulder muscles are SPINO-CLAVICULAR? Traps
Which shoulder muscles are SCAPULO-HUMERAL? Supraspinatus, Infraspinatus, Subscapularis, Teres Minor, Posterior Delt, Teres Major, Triceps, Biceps, Coracobrachilalis
Which shoulder muscles are CLAVICULO-HUMERAL? Anterior Deltoid, Pec Major (Clavicular)
Which shoulder muscles are THORACO-HUMERAL? Pec Major
Which shoulder muscles are THORACO-SCAPULAR? Pec Minor, Serratus Anterior
When does Clavicular Elevation begin, during UE Elevation? Begins early and ends @ 90-100 degrees of humeral elevation
What is the ratio of Clavicular to Humeral elevation 4:1
Where is the joint axis through the clavicle? At the sternal end of the clavicle
How far does the AC joint widen during retraction? 10 degrees
During which motion does the AC joint narrow? Protraction
Where is the joint axis for protraction/retraction at AC joint? Motion occurs through the vertical axis of the clavicle