Document Detail

Radiographic evaluation of glenohumeral kinematics: a muscle fatigue model.
MedLine Citation:
PMID:  10077797     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to document the effect of muscle fatigue on glenohumeral kinematics. Twelve male volunteers without shoulder disease and with an average age of 27 years were studied. Glenohumeral anteroposterior radiographs were taken at 45 degrees intervals as the arm was abducted in the plane of the scapula from 0 degree to 135 degrees. This series of radiographs was performed both before and immediately after the subject performed a series of deltoid and rotator cuff fatiguing exercises. The average humeral head position or translation before and after muscle fatigue for each arm angle was compared. For all subjects, before fatigue, the position of the humeral head was below the center of the glenoid for all angles of abduction. There was essentially no change in position of the humeral head in the prefatigue state, as the arm was abducted from 0 degree to 135 degrees with no more than an average 0.3 mm of total humeral head excursion. After fatigue, excursion of the humeral head increased to an average of 2.5 mm between the tested positions. The position of the humeral head with the arm at 0 degree of abduction was lower or had migrated inferiorly compared with the rested state, with an average 1.2 mm significant increase in inferior translation. With the initiation of abduction, the humeral head demonstrated significant superior migration or translation in all positions tested. This result has important implications for conservative treatment of shoulder impingement and underscores the importance of rehabilitation to maximize the endurance and strength of the rotator cuff musculature.
S K Chen; P T Simonian; T L Wickiewicz; J C Otis; R F Warren
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.]     Volume:  8     ISSN:  1058-2746     ISO Abbreviation:  J Shoulder Elbow Surg     Publication Date:    1999 Jan-Feb
Date Detail:
Created Date:  1999-05-06     Completed Date:  1999-05-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9206499     Medline TA:  J Shoulder Elbow Surg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  49-52     Citation Subset:  IM    
Sports Medicine and Shoulder Service, Hospital for Special Surgery, New York, NY, USA.
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MeSH Terms
Double-Blind Method
Exercise Test
Muscle Fatigue / physiology*
Range of Motion, Articular / physiology*
Reference Values
Shoulder Joint / physiology*,  radiography*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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