DYNAMIC STABILIZATION OF SHOULDER JOINT (SHOULDER JOINT COMPLEX BIOMECHANICS)Physiotherapy Tutorials
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summary of the video with the time for reference:
1. Deltoid 2:16
has a large superior force which cannot be countered by gravity and coraco acromial arch blocking it can cause impingement.
hence deltoid cannot cause elevation independently
2.Rotator cuff muscles 6:28
S-Supraspinatus
I-Infraspinatus
T-Teres minor
S-Subscapularis
Fx component that is downward provides the offset for superior forces of deltoid.
Fy component also pulls the humerus inward
Rotator cuff muscles on posterior side cause external rotation of humerus
subscapularis causes internal rotation hence provides anterior posterior stability
hence they are called as steerers
3.Supraspinatus 12:07
-more superiorly located
-has a larger moment arm
-produces greater torque
-can carry out the whole abduction
4.Biceps Tendon 13:53
travels in bicipital groove formed by greater and lesser tubercle
held in place by transverse ligament
causes flexion and abduction at shoulder joint
causes superior inferior stability
provides anterior stability
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