- Discussion:
- shoulder is bounded posteriorly by
teres minor &
infraspinatus & partialy by long head of
triceps;
- it is bounded laterally by
deltoid, & superiorly it is bounded by acromion;
- anteriorly & inferiorly, shoulder is bounded by
pect major &
biceps, however, these do not completely stabilize glenohumeral joint;
- anteriorly, articular ligaments & joint
capsule provide major support;
- Subscapularis:
- acts as secondary restraint & is frequently attenuated w/ shoulder dislocations;
- Supraspinatus,
Intraspinatus, &
Teres minor:
- originates from posterior aspect of scapula & inserts into greater tuberosity;
- these muscles resist anterior translation of the proximal humerus;
- these muscles are necessarily stretched to allow anterior dislocation & in a minority of dislocations, there may be an avulsion of their insertion during
dislocation to stabilize the shoulder;
Dynamic capsuloligamentosis anatomy of the glenohumeral joint.
J. Warner et al.
J. Shoulder Elbow Surg. Vol 2. 1993. p 115.
