To differentiate Type II from Type III, one can take an AP stress view of the AC joint, where the patient suspends 10-15 pound weights from each wrist.

Acromio-Clavicular Joint Separation Pictures Skeletal acDislocationWeightBearing.jpg AP stress view of Type III separation

Acromio-Clavicular Joint Separation Pictures Skeletal acDislocation2.jpg AP stress view of Type II separation


Source: University of Virginia.