OBJECTIVE: To evaluate the features of the posterior labrocapsular periosteal sleeve @entity155 (POLPSA) lesion on MR imaging in athletes with posterior shoulder instability. DESIGN AND @entity1 : Six male athletes (age range 19-43 years) with @entity155 of the posterior glenoid periosteum were identified on MR imaging. There were four football players, one wrestler, and one competitive weightlifter. The weightlifter had a bilateral condition so that seven shoulders were evaluated. MR imaging was performed with a 1.5 T magnet utilizing conventional and fat-saturated fast spin-echo coronal oblique and sagittal oblique sequences and a 3D-GRE transaxial sequence. Surgical correlation was available in all shoulders. RESULTS: All @entity1 presented with @entity158 and a joint effusion. The size of the periosteal sleeve and redundant joint recess was variable. Fibrous proliferation was noted arthroscopically in four shoulders beneath the sleeve. Although the posterior labrum was detached in all studies, only one labrum had a tear while two showed marked degeneration. CONCLUSION: The POLPSA lesion is an abnormality that can be associated with posterior instability. It differs from a reverse @entity75 because the periosteum, although detached, remains intact with the posterior capsule and detached posterior labrum. This lesion may represent an acute form of a @entity75 .

The POLPSA lesion: MR imaging findings with arthroscopic correlation in XXXX with posterior instability.

@entity1 :: ('9606', 'Species') :: ['patients', 'PATIENTS'] @entity158 :: ('MESH:D010146', 'Disease') :: ['pain'] @entity75 :: ('MESH:D001927', 'Disease') :: ['Bennett lesion', 'Bankart lesion'] @entity155 :: ('MESH:D014084', 'Disease') :: ['avulsion']
@entity1 :: (9606,Species) :: ['patients']
