ALPSAAnterior Labroligamentous Periosteal Sleeve Avulsion (lesion)
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POLPSA (posterior labral periosteal sleeve avulsion) lesions are similar to ALPSA lesions and are characterized by stripping of the periosteum attached to the posterior labrum as it is avulsed from the glenoid rim.
An ALPSA (anterior labral periosteal sleeve avulsion) is a Bankart variant, however, in this lesion the avulsed periosteum remains intact.
13) This is differentiated from the ALPSA lesion by the lack of displacement of the avulsed labrum and is best viewed on MRI in the abducted and externally rotated (ABER) position.