The glenohumeral (shoulder) joint is a highly mobile ball and socket joint, which consists of several components.
– scapula, clavicle, humerus
Rotator cuff muscles
– subscapularis, supraspinatus, infraspinatus, teres minor
– deltoid, biceps and pectoralis
These following pictures enlarge to show the bony features of the glenohumeral joint.
The stability of the enlocated joint depends upon four factors:
|The suction cup effect of the glenoid labrum around the humeral head
Negative gleno-humeral intra-articular pressure and limited joint volume
Static stabilisers, including labrum, ligaments and joint capsule
Dynamic stabilizers especially rotator cuff and biceps muscles
It’s easy to forget scapula position, but this is one of the most crucial things to think about when you relocate a shoulder! Review the anatomical differences between the retroverted and anterverted scapula here.