Document Detail


Quantitative assessment of the vascularity of the proximal part of the humerus.
MedLine Citation:
PMID:  20360519     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The current consensus in the literature is that the anterolateral branch of the anterior humeral circumflex artery provides the main blood supply to the humeral head. While the artery is disrupted in association with 80% of proximal humeral fractures, resultant osteonecrosis is infrequent. This inconsistency suggests a greater role for the posterior humeral circumflex artery than has been previously described. We hypothesized that the posterior humeral circumflex artery provides a greater percentage of perfusion to the humeral head than the anterior humeral circumflex artery does. METHODS: In twenty-four fresh-frozen cadaver shoulders (twelve matched pairs), we cannulated the axillary artery proximal to the thoracoacromial branch and ligated the brachial artery in the forearm. In each pair, one shoulder served as a control with intact vasculature and, in the contralateral shoulder, either the anterior humeral circumflex artery or the posterior humeral circumflex artery was ligated. Gadolinium was injected through the cannulated axillary arteries, and magnetic resonance imaging was performed. After imaging, a urethane polymer was injected, and specimens were dissected. For volumetric analysis, the gadolinium uptake on the magnetic resonance imaging was quantified in each quadrant of the humeral head with use of a custom automated program. The gadolinium uptake was compared between the control and ligated sides and between the ligated anterior humeral circumflex artery and ligated posterior humeral circumflex artery groups. RESULTS: The posterior humeral circumflex artery provided 64% of the blood supply to the humeral head overall, whereas the anterior humeral circumflex artery supplied 36%. The posterior humeral circumflex artery also provided significantly more of the blood supply in three of the four quadrants of the humeral head. CONCLUSIONS: The finding that the posterior humeral circumflex artery provides 64% of the blood supply to the humeral head provides a possible explanation for the relatively low rates of osteonecrosis seen in association with displaced fractures of the proximal part of the humerus. In addition, protecting the posterior humeral circumflex artery during the surgical approach and fracture fixation may minimize loss of the blood supply to the humeral head.
Authors:
Carolyn M Hettrich; Sreevathsa Boraiah; Jonathan P Dyke; Andrew Neviaser; David L Helfet; Dean G Lorich
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  The Journal of bone and joint surgery. American volume     Volume:  92     ISSN:  1535-1386     ISO Abbreviation:  J Bone Joint Surg Am     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-02     Completed Date:  2010-05-03     Revised Date:  2010-10-25    
Medline Journal Info:
Nlm Unique ID:  0014030     Medline TA:  J Bone Joint Surg Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  943-8     Citation Subset:  AIM; IM    
Affiliation:
Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA. hettrichc@hss.edu
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MeSH Terms
Descriptor/Qualifier:
Aged
Arteries / anatomy & histology
Axillary Artery / anatomy & histology
Cadaver
Contrast Media
Gadolinium DTPA / diagnostic use
Humans
Humerus / blood supply*
Magnetic Resonance Angiography
Middle Aged
Polymers / diagnostic use
Chemical
Reg. No./Substance:
0/Contrast Media; 0/Polymers; 80529-93-7/Gadolinium DTPA

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


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