Statically,
the gleohumeral joint (shoulder) is inherently unstable based solely on
its bony configuration, composition, geometry, and somewhat lax
ligamentous restraints (8). Glenohumeral joint geometry is composed of a
large convex humeral head positioned in a relatively smaller concave
glenoid fossa. This affords the shoulder tremendous mobility at the
expense of stability. The ligamentous restraints surrounding the joint
(i.e., joint capsule and the bands of the anterior glenohumeral
ligament) normally provide for a moderate degree of static stability.
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