Document Detail

Three-dimensional acromioclavicular joint motions during elevation of the arm.
MedLine Citation:
PMID:  18434666     Owner:  NLM     Status:  MEDLINE    
STUDY DESIGN: Descriptive laboratory study. OBJECTIVES: To determine the 3-dimensional motions occurring between the scapula relative to the clavicle at the acromioclavicular joint during humeral elevation in the scapular plane. BACKGROUND: Shoulder pathology is commonly treated through exercise programs aimed at correcting scapular motion abnormalities. However, little is known regarding how acromioclavicular joint motions contribute to normal and abnormal scapulothoracic motion. METHODS AND MEASURES: Thirty subjects (16 males, 14 females) participated. Subjects with positive symptoms on clinical exam or past history of shoulder pathology, trauma, or surgery were excluded. Electromagnetic surface motion analysis was performed tracking the thorax, clavicle, scapula, and humerus. Subjects performed 3 repetitions of scapular plane abduction. Passive motion data were also collected for scapular plane abduction from cadaver specimens. Data were analyzed using within-session reliability and descriptive statistics as well as repeated measures analyses of variance (ANOVAs) to determine the effect of elevation angle from rest to 90 masculine humeral elevation. Reliability was determined from repeated trials in the same session without removing sensors or redigitizing landmarks. RESULTS: Angular values were highly repeatable within session (ICC>0.94; SEM, < 2.3 degrees ). During active scapular plane abduction from rest to 90 degrees , average acromioclavicular joint angular values demonstrated increased internal rotation (approximately 4.3 degrees ), increased upward rotation (approximately 14.6 degrees ), and increased posterior tilting (approximately 6.7 degrees ) (P<.05). Passive motions on cadavers demonstrated similar kinematic patterns. CONCLUSIONS: Significant motion occurs at the acromioclavicular joint during active humeral elevation, contributing to scapular motion on the thorax. This information provides a foundation for understanding normal acromioclavicular joint motion as a basis for further investigation of pathology and rehabilitation approaches.
Rachael M Teece; Jason B Lunden; Angela S Lloyd; Andrew P Kaiser; Cort J Cieminski; Paula M Ludewig
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2007-12-07
Journal Detail:
Title:  The Journal of orthopaedic and sports physical therapy     Volume:  38     ISSN:  0190-6011     ISO Abbreviation:  J Orthop Sports Phys Ther     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-04-24     Completed Date:  2008-07-31     Revised Date:  2010-03-23    
Medline Journal Info:
Nlm Unique ID:  7908150     Medline TA:  J Orthop Sports Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  181-90     Citation Subset:  IM    
Program in Physical Therapy, Rehabilitation Sciences Program, University of Minnesota, Minneapolis, MN, USA.
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MeSH Terms
Acromioclavicular Joint / physiology*
Aged, 80 and over
Imaging, Three-Dimensional*
Middle Aged
Range of Motion, Articular*
Grant Support
K01 HD042491-01A1/HD/NICHD NIH HHS; K01 HD042491-02/HD/NICHD NIH HHS; K01 HD042491-03/HD/NICHD NIH HHS; K01 HD042491-04/HD/NICHD NIH HHS; K01HD042491/HD/NICHD NIH HHS

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