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Anterior labroligamentous periosteal sleeve avulsion lesion

Dr Yuranga Weerakkody and Dr Frank Gaillard et al.

An anterior labroligamentous periosteal sleeve avulsion (ALPSA) lesion is similar to a Bankart lesion, in that it too is usually due to anterior shoulder dislocation, and involves the anterior inferior labrum.

Unlike the Bankart lesion in which the labrum is avulsed from the underlying glenoid, in an ALPSA lesion the mobilised labrum remains attached to the periosteum which overlies the glenoid (thus sleeve). As a result it can heal (as opposed to Bankart which do not), however it can do so in an abnormal position requiring identification and early surgical repair.

References

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3. Robinson G, Ho Y, Finlay K et-al. Normal anatomy and common labral lesions at MR arthrography of the shoulder. Clin Radiol. 2006;61 (10): 805-21. doi:10.1016/j.crad.2006.06.002 - Pubmed citation