Regarding the abnormal shape of shoulder joint, the error is:
A.
Square shoulder: arc disappeared, acromion prominent, seen in shoulder dislocation or triangular muscular atrophy.
B.
Shrugging : shoulder blade is high, shoulder height is different, neck is short, shrugging is seen in congenital high scapular disease and scoliosis.
C.
Shoulder prolapse: clavicle fracture, distal end prolapse, causing the lateral shoulder to droop.
D.
Shoulder protrusion deformity (acromioclavicular shoulder): caused by excessive upwarping of the external end of the clavicle, seen in traumatic acromioclavicular joint dislocation
E.
Square shoulder: it is caused by excessive upwarping of the outer end of the clavicle, which can be seen in the dislocation of the acromioclavicular joint