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In-vivo glenohumeral translation and ligament elongation during abduction and abduction with internal and external rotation

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Show simple item record Massimini, Daniel Frank Boyer, Patrick J. Papannagari, Ramprasad Gill, Thomas J. Warner, Jon P. Li, Guoan 2012-11-16T19:56:13Z 2012-11-16T19:56:13Z 2012-06 2011-06
dc.identifier.issn 1749-799X
dc.description.abstract Study Design: Basic Science. To investigate humeral head translations and glenohumeral ligament elongation with a dual fluoroscopic imaging system. Background: The glenohumeral ligaments are partially responsible for restraining the humeral head during the extremes of shoulder motion. However, in-vivo glenohumeral ligaments elongation patterns have yet to be determined. Therefore, the objectives of this study were to 1) quantify the in-vivo humeral head translations and glenohumeral ligament elongations during functional shoulder positions, 2) compare the inferred glenohumeral ligament functions with previous literature and 3) create a baseline data of healthy adult shoulder glenohumeral ligament lengths as controls for future studies. Methods: Five healthy adult shoulders were studied with a validated dual fluoroscopic imaging system (DFIS) and MR imaging technique. Humeral head translations and the superior, middle and inferior glenohumeral ligaments (SGHL, MGHL, IGHL) elongations were determined. Results: The humeral head center on average translated in a range of 6.0mm in the anterior-posterior direction and 2.5mm in the superior-inferior direction. The MGHL showed greater elongation over a broader range of shoulder motion than the SGHL. The anterior-band (AB)-IGHL showed maximum elongation at 90° abduction with maximum external rotation. The posterior-band (PB)-IGHL showed maximum elongation at 90° abduction with maximum internal rotation. Discussion: The results demonstrated that the humeral head translated statistically more in the anterior-posterior direction than the superior-inferior direction (p = 0.01), which supports the concept that glenohumeral kinematics are not ball-in-socket mechanics. The AB-IGHL elongation pattern makes it an important static structure to restrain anterior subluxation of the humeral head during the externally rotated cocking phase of throwing motion. These data suggest that in healthy adult shoulders the ligamentous structures of the glenohumeral joint are not fully elongated in many shoulder positions, but function as restraints at the extremes of glenohumeral motion. Clinically, these results may be helpful in restoring ligament anatomy during the treatment of anterior instability of the shoulder. en_US
dc.language.iso en_US
dc.publisher Biomed Central Ltd. en_US
dc.relation.isversionof en_US
dc.rights Creative Commons Attribution en_US
dc.rights.uri en_US
dc.source BioMed Central en_US
dc.title In-vivo glenohumeral translation and ligament elongation during abduction and abduction with internal and external rotation en_US
dc.type Article en_US
dc.identifier.citation Massimini, Daniel F et al. “In-vivo Glenohumeral Translation and Ligament Elongation During Abduction and Abduction with Internal and External Rotation.” Journal of Orthopaedic Surgery and Research 7.1 (2012): 29. © 2012 BioMed Central Ltd en_US
dc.contributor.department Massachusetts Institute of Technology. Department of Mechanical Engineering en_US
dc.contributor.mitauthor Massimini, Daniel Frank
dc.relation.journal Journal of Orthopaedic Surgery and Research en_US
dc.identifier.mitlicense PUBLISHER_CC en_US
dc.eprint.version Final published version en_US
dc.type.uri en_US
eprint.status en_US
dspace.orderedauthors Massimini, Daniel F; Boyer, Patrick J; Papannagari, Ramprasad; Gill, Thomas J; Warner, Jon P; Li, Guoan en

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