2006
DOI: 10.1002/jor.20188
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Variation in external rotation moment arms among subregions of supraspinatus, infraspinatus, and teres minor muscles

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… Show more

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Cited by 27 publications
(28 citation statements)
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“…For example, the peak abduction moment arm of the middle deltoid in the model was 29.0 mm, which is close to the peak value of 30 mm measured by Poppen and Walker (1978) and identical to that measured by Kuechle et al (1997). Also, the internal rotation moment arm of the inferior infraspinatus at 601 of abduction was 17.5 mm, compared to 17 mm reported by Langenderfer et al (2006). As segment anthropometry and muscle lines-of-action were based on detailed measurements taken from eight cadaver specimens, we believe the model used in the present study provides a realistic representation of the capacities of the individual muscles of the shoulder to accelerate the glenohumeral joint.…”
Section: Tablesupporting
confidence: 81%
“…For example, the peak abduction moment arm of the middle deltoid in the model was 29.0 mm, which is close to the peak value of 30 mm measured by Poppen and Walker (1978) and identical to that measured by Kuechle et al (1997). Also, the internal rotation moment arm of the inferior infraspinatus at 601 of abduction was 17.5 mm, compared to 17 mm reported by Langenderfer et al (2006). As segment anthropometry and muscle lines-of-action were based on detailed measurements taken from eight cadaver specimens, we believe the model used in the present study provides a realistic representation of the capacities of the individual muscles of the shoulder to accelerate the glenohumeral joint.…”
Section: Tablesupporting
confidence: 81%
“…Boundary conditions were applied to replicate an experimental measurement of external rotation muscle moment arms for infraspinatus and teres minor (Langenderfer et al, 2006a) (Fig. 1).…”
Section: Methodsmentioning
confidence: 99%
“…Muscle origin and insertion sites were identified relative to scapular landmarks (Langenderfer et al, 2006a). The muscle insertions were defined by dividing the respective tendon into equal-width sub-regions and attaching to the center of each sub-region.…”
Section: Model Developmentmentioning
confidence: 99%
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