Variation in external rotation moment arms among subregions of supraspinatus, infraspinatus, and teres minor muscles
dc.contributor.author | Langenderfer, Joseph E. | en_US |
dc.contributor.author | Patthanacharoenphon, Cameron | en_US |
dc.contributor.author | Carpenter, James E. | en_US |
dc.contributor.author | Hughes, Richard E. | en_US |
dc.date.accessioned | 2007-09-18T19:20:07Z | |
dc.date.available | 2007-09-18T19:20:07Z | |
dc.date.issued | 2006-08 | en_US |
dc.identifier.citation | Langenderfer, Joseph E.; Patthanacharoenphon, Cameron; Carpenter, James E.; Hughes, Richard E. (2006). "Variation in external rotation moment arms among subregions of supraspinatus, infraspinatus, and teres minor muscles." Journal of Orthopaedic Research 24(8): 1737-1744. <http://hdl.handle.net/2027.42/55787> | en_US |
dc.identifier.issn | 0736-0266 | en_US |
dc.identifier.issn | 1554-527X | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/55787 | |
dc.identifier.uri | http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=16779813&dopt=citation | en_US |
dc.description.abstract | A rotator cuff tear causes morphologic changes in rotator cuff muscles and tendons and reduced shoulder strength. The mechanisms by which these changes affect joint strength are not understood. This study's purpose was to empirically determine rotation moment arms for subregions of supraspinatus, infraspinatus, and for teres minor, and to test the hypothesis that subregions of the cuff tendons increase their effective moment arms through connections to other subregions. Tendon excursions were measured for full ranges of rotation on 10 independent glenohumeral specimens with the humerus abducted in the scapular plane at 10 and 60°. Supraspinatus and infraspinatus tendons were divided into equal width subregions. Two conditions were tested: tendon divided to the musculotendinous junction, and tendon divided to the insertion on the humerus. Moment arms were determined from tendon excursion via the principle of virtual work. Moment arms for the infraspinatus ( p < 0.001) and supraspinatus ( p < 0.001) were significantly greater when the tendon was only divided to the musculotendinous junction versus division to the humeral head. Moment arms across subregions of infraspinatus ( p < 0.001) and supraspinatus ( p < 0.001) were significantly different. A difference in teres minor moment arm was not found for the two cuff tendon conditions. Moment arm differences between muscle subregions and for tendon division conditions have clinical implications. Interaction between cuff regions could explain why some subjects retain strength after a small cuff tear. This finding helps explain why a partial cuff repair may be beneficial when a complete repair is not possible. Data presented here can help differentiate between cuff tear cases that would benefit from cuff repair and cases for which cuff repair might not be as favorable. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 24:1737–1744, 2006 | en_US |
dc.format.extent | 354909 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Wiley Subscription Services, Inc., A Wiley Company | en_US |
dc.subject.other | Life and Medical Sciences | en_US |
dc.subject.other | Medicine and Healthcare, Orthopaedics | en_US |
dc.title | Variation in external rotation moment arms among subregions of supraspinatus, infraspinatus, and teres minor muscles | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Biomedical Engineering, University of Michigan, 24 Frank Lloyd Wright Dr., P.O. Box 391, Ann Arbor, Michigan 48106-0391 | en_US |
dc.contributor.affiliationum | Department of Biomedical Engineering, University of Michigan, 24 Frank Lloyd Wright Dr., P.O. Box 391, Ann Arbor, Michigan 48106-0391 | en_US |
dc.contributor.affiliationum | Department of Orthopaedic Surgery, University of Michigan | en_US |
dc.contributor.affiliationum | Department of Biomedical Engineering, University of Michigan, 24 Frank Lloyd Wright Dr., P.O. Box 391, Ann Arbor, Michigan 48106-0391 ; Department of Orthopaedic Surgery, University of Michigan ; Department of Biomedical Engineering, University of Michigan, 24 Frank Lloyd Wright Dr., P.O. Box 391, Ann Arbor, Michigan 48106-0391. Telephone: 734-930-7388; Fax: 734-930-7379 | en_US |
dc.identifier.pmid | 16779813 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/55787/1/20188_ftp.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1002/jor.20188 | en_US |
dc.identifier.source | Journal of Orthopaedic Research | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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