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dc.contributor.authorMassimini, Daniel Frank
dc.contributor.authorBoyer, Patrick J.
dc.contributor.authorPapannagari, Ramprasad
dc.contributor.authorGill, Thomas J.
dc.contributor.authorWarner, Jon P.
dc.contributor.authorLi, Guoan
dc.date.accessioned2012-11-16T19:56:13Z
dc.date.available2012-11-16T19:56:13Z
dc.date.issued2012-06
dc.date.submitted2011-06
dc.identifier.issn1749-799X
dc.identifier.urihttp://hdl.handle.net/1721.1/74667
dc.description.abstractStudy 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.isoen_US
dc.publisherBiomed Central Ltd.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1186/1749-799x-7-29en_US
dc.rightsCreative Commons Attributionen_US
dc.rights.urihttp://creativecommons.org/licenses/by/2.0en_US
dc.sourceBioMed Centralen_US
dc.titleIn-vivo glenohumeral translation and ligament elongation during abduction and abduction with internal and external rotationen_US
dc.typeArticleen_US
dc.identifier.citationMassimini, 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 Ltden_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineeringen_US
dc.contributor.mitauthorMassimini, Daniel Frank
dc.relation.journalJournal of Orthopaedic Surgery and Researchen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsMassimini, Daniel F; Boyer, Patrick J; Papannagari, Ramprasad; Gill, Thomas J; Warner, Jon P; Li, Guoanen
mit.licensePUBLISHER_CCen_US
mit.metadata.statusComplete


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