| Effect of forearm axially rotated posture on shoulder load and shoulder abduction / flexion angles in one-armed arrest of forward falls. | |
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MedLine Citation:
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PMID: 21093130 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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BACKGROUND: Falling onto the outstretched hand is the most common cause of upper extremity injury. This study develops an experimental model for evaluating the shoulder load during a simulated forward fall onto one hand with three different forearm axially rotated postures, and examines the shoulder abduction angle and shoulder flexion angle in each case. METHODS: Fifteen healthy young male subjects with an average age of 23.7years performed a series of one-armed arrests from a height of 5cm onto a force plate. The kinematics and kinetics of the upper extremity were analyzed for three different forearm postures, namely 45° externally rotated, non-rotated, and 45° internally rotated. FINDINGS: The shoulder joint load and shoulder abduction/flexion angles were significantly dependent on the rotational posture of the forearm. The shoulder medio-lateral shear forces in the externally rotated group were found to be 1.61 and 2.94 times higher than those in the non-rotated and internally rotated groups, respectively. The shoulder flexion angles in the externally rotated, non-rotated and internally rotated groups were 0.6°, 8.0° and 19.2°, respectively, while the corresponding shoulder abduction angles were 6.1°, 34.1° and 46.3°, respectively. INTERPRETATION: In falls onto the outstretched hand, an externally rotated forearm posture should be avoided in order to reduce the medio-lateral shear force acting on the shoulder joint. In falls of this type, a 45° internally rotated forearm posture represents the most effective fall strategy in terms of minimizing the risk of upper extremity injuries. |
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Authors:
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Hsiu-Hao Hsu; You-Li Chou; Shu-Zon Lou; Ming-Jer Huang; Paul Pei-Hsi Chou |
Publication Detail:
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Type: Journal Article Date: 2010-11-18 |
Journal Detail:
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Title: Clinical biomechanics (Bristol, Avon) Volume: 26 ISSN: 1879-1271 ISO Abbreviation: Clin Biomech (Bristol, Avon) Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-03-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8611877 Medline TA: Clin Biomech (Bristol, Avon) Country: England |
Other Details:
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Languages: eng Pagination: 245-9 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Engineering Science, National Cheng-Kung University, Tainan, Taiwan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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