ACJ separation grading - Rockwood.

    1. ACJ lig sprain with minimal change in height.

    2. ACJ lig tear with widened joint.

    3. Clavicle 1 bone width superiorly displaced, disrupted CC ligs.

    4. As above with posterior displaced clavicle.

    5. As 3, with marked superior displacement.

    6. Inferiorly displaced clavicle, either subacromial or subcoracoid.