Thoracic Outlet Syndrome (TOS) is a very common set of posture dysfunctional patterns. Adson’s, Eden’s, & Wright’s tests are designed to assess TOS.
Thoracic outlet syndrome is a condition that causes compression of nerves and/or blood vessels where the thorax outlets into the upper extremity.
There is an old saying that no posture is bad unless you get stuck in it. The problem is that the thoracic spine often does get stuck in bad posture.