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HERO ID
1871290
Reference Type
Journal Article
Title
The Effect of Isometric Shoulder Internal and External Rotation on the Acromiohumeral Distance
Author(s)
White, CE; Dedrick, GS; Apte, GG; Sizer, PS; Brismee, JM
Year
2012
Is Peer Reviewed?
Yes
Journal
American Journal of Physical Medicine and Rehabilitation
ISSN:
0894-9115
EISSN:
1537-7385
Volume
91
Issue
3
Page Numbers
193-199
Language
English
PMID
22173082
DOI
10.1097/PHM.0b013e31823c74ab
Web of Science Id
WOS:000300708900002
Abstract
OBJECTIVE:
This study aimed to determine the effect of isometric internal and external rotation at various degrees of shoulder abduction on the acromiohumeral distance (AHD).
DESIGN:
This was a prospective study that used a within-subject repeated-measures design and randomization of independent variables. Data from 29 of 58 (40 women, 18 men) prospectively enrolled healthy subjects were used for analysis. A still ultrasound image of the right subacromial space was taken to measure the AHD for each of three contraction conditions (rest, isometric internal, and external rotation) at three shoulder positions (neutral and 30 and 45 degrees of abduction).
RESULTS:
Intrarater reliability ranged from 0.86 to 0.99. At 45 degrees of shoulder abduction, the AHD was significantly smaller with isometric external rotation when compared with no contraction (P = 0.0015) and with isometric internal rotation (P = 0.0002).
CONCLUSIONS:
The AHD was not affected by resistive isometric internal rotation of the shoulder, although it decreased with resistive isometric external rotation at 45 degrees of shoulder abduction. Resistive isometric shoulder external rotation in a position of abduction should be used with caution when the goal is to maintain the AHD. Further research is required to determine the effects of isometric contraction in patients with subacromial impingement syndrome.
Keywords
Subacromial Space; Acromiohumeral Distance; Ultrasound Imaging; Glenohumeral Translation; Sonography
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