PURPOSE: To compare the @entity5529 ( @entity5529 ) of both shoulders in subjects with a unilateral @entity5818 ( @entity5818 ) and healthy subjects in a seated position during free shoulder movements of large amplitude. MATERIALS AND METHODS: Using a 0.5-Tesla SIGNA-SP/i trade mark open-configuration magnetic resonance imaging (MRI) system, the @entity5529 was measured at several arm positions, in a standardized seated position. RESULTS: In flexion (rest to 130 degrees ), the mean @entity5529 of @entity5818 varied from 8.3 to 2.8 mm, as compared to from 8.7 to 4.1 mm for asymptomatic contralateral shoulders. In abduction (rest to 110 degrees ), the @entity5529 varied from 8.1 to 3.4 mm and from 8.8 to 4.6 mm for @entity5818 and asymptomatic shoulders, respectively. The smallest @entity5529 (P <.01) was observed at 110 degrees. From 80 degrees of arm elevation, the @entity5529 was significantly smaller in impingement than in asymptomatic shoulders (P <.05). The @entity5529 of asymptomatic shoulders did not differ from that of healthy subjects. In @entity5818 , the @entity5529 at rest was correlated with its reduction at all shoulder positions (r(p) = 0.62-0.88), but was a poor predictor of the smallest @entity5529 observed at 110 degrees (flexion, R(2) = 0.09; abduction, R(2) = 0.08). CONCLUSION: In the critical arm elevation positions for impingement, @entity5529 is discriminative for @entity5818 , compared to asymptomatic shoulders and healthy ones. @entity5529 at rest is a good indicator of the magnitude of its reduction in elevation, but not of the smallest @entity5529 in arm elevation.

Acromiohumeral distance in a seated position in persons with XXXX .

@entity5818 :: ('MESH:D019534', 'Disease') :: ['SIS', 'shoulder impingement syndrome'] @entity5529 :: ('MESH:C535290', 'Disease') :: ['AHD', 'acromiohumeral distance']
@entity5818 :: (MESH:D019534,Disease) :: ['impingement syndrome']
