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- Title
Acromiohumeral distance in a seated position in persons with impingement syndrome.
- Authors
Luc J. Hébert; Hélène Moffet; Marie Dufour; Christian Moisan
- Abstract
To compare the acromiohumeral distance (AHD) of both shoulders in subjects with a unilateral shoulder impingement syndrome (SIS) and healthy subjects in a seated position during free shoulder movements of large amplitude. Using a 0.5-Tesla SIGNA-SP/i open-configuration magnetic resonance imaging (MRI) system, the AHD was measured at several arm positions, in a standardized seated position. In flexion (rest to 130°), the mean AHD of SIS 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°), the AHD varied from 8.1 to 3.4 mm and from 8.8 to 4.6 mm for SIS and asymptomatic shoulders, respectively. The smallest AHD (P < .01) was observed at 110°. From 80° of arm elevation, the AHD was significantly smaller in impingement than in asymptomatic shoulders (P < .05). The AHD of asymptomatic shoulders did not differ from that of healthy subjects. In SIS, the AHD at rest was correlated with its reduction at all shoulder positions (rp = 0.620.88), but was a poor predictor of the smallest AHD observed at 110° (flexion, R2 = 0.09; abduction, R2 = 0.08). In the critical arm elevation positions for impingement, AHD is discriminative for SIS, compared to asymptomatic shoulders and healthy ones. AHD at rest is a good indicator of the magnitude of its reduction in elevation, but not of the smallest AHD in arm elevation. J. Magn. Reson. Imaging 2003;18:7279. © 2003 Wiley-Liss, Inc.
- Subjects
MAGNETIC resonance imaging; DIAGNOSTIC imaging; EXTREMITIES (Anatomy); SHOULDER; MEDICAL imaging systems
- Publication
Journal of Magnetic Resonance Imaging, 2003, Vol 18, Issue 1, p72
- ISSN
1053-1807
- Publication type
Article
- DOI
10.1002/jmri.10327