Shoulder Shrug Sign? There are 2 primary reasons why you may have a shoulder shrug. Don’t assume! Mobility - There is a limitation in mobility that is causing the shrug. If there is a large shrug sign it’s often more significant than simple tightness. I find it’s often the inferior capsule of the joint. This is common in frozen shoulder or after shoulder surgery Control - Did you check if the person has full passive range of motion? If there is no limitation in passive mobility, it’s a control i