What are the main muscles that get affected by Frozen Shoulder?

Why does Cortisone not reliably fix Frozen shoulder??

Can poor posture aggravate Frozen shoulder?

Whats the link between Brachial Syndrome and Frozen shoulder?

What does Adhesive capsulitis mean in relation to Frozen shoulder?

Thoracic outlet syndrome (TOS) and frozen shoulder

What can start a Frozen shoulder?