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Both anterior and posterior sail signs can exist and can usually be seen on the same xray. sometimes all you see is a secondary sign to clue you in to an occult fracture.
Explanation
including neurological, vascular, tenons and ligament injuries
Barton's fracture also affects the distal radial head. intra-articular fracture of the distal radius with dislocation of the radiocarpal joint.
Note the tuberosities have moved more anteriorly.
Notice the notching on the posterolateral humeral head
A stress view of the AC joint, patient is neutral and they hold a sand bag and you look for abnormal widening of the space.
Colles - extra articular, Barton - intrarticular.
This is the axillary transaxial view which is not usually very useful.