ArticleClinical biomechanics (Bristol, Avon)2023
Moment arms of the anatomical subregions of the rotator cuff muscles during shoulder rotation.
Article in Clinical biomechanics (Bristol, Avon), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Progressive Rotator Cuff Tears Alter Strain Across Footprint and Tear Borders: Subregion-Specific Loading Reveals Size-Dependent Mechanical Risk Zones.Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2026Article
- Subregions of the Rotator Cuff Muscles Present Distinct Anatomy, Biomechanics, and Function.Sports (Basel, Switzerland) · 2024Review
- Tension Distribution in Articular Surfaces of the Rotator Cable and Crescent: A Cadaveric Study.The Journal of bone and joint surgery. American volume · 2024Article
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Authors and funding
5 authors.
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Abstract
backgroundRotator cuff muscles are responsible for humeral rotation. Moment arms of different regions of these muscles during humeral rotation were analyzed in neutral and abducted positions.
methodsIn eight cadaveric shoulders, subregions of the rotator cuff muscles were identified and their excursion during humeral rotation was measured in neutral and abducted positions from an internal rotation of 30° to an external rotation of 45°, with 15° increments, using a 3-D digitizing system. Statistical tests were used to assess differences between subregions within a single muscle.
findingsThe posterior-deep subregion of the supraspinatus muscle had greater moment arms compared to the anterior-superficial and anterior-middle subregions in both positions (p < 0.001). The middle and inferior subregions of the infraspinatus muscle and the teres minor muscle showed differences in moment arms compared to the superior region in an abducted position (p < 0.042). The superior subregion of the subscapularis muscle showed differences in moment arms compared to the middle and inferior subregions in an abducted position (p < 0.001).
interpretationThe posterior-deep subregion of the supraspinatus muscle behaved similar to the infraspinatus muscle, as an external rotator. The anterior-superficial and anterior-middle subregions of the supraspinatus muscle showed a biphasic behavior during rotation at a neutral position, but acted as pure external rotators during rotation at an abducted position. Inferior subregions of the infraspinatus and subscapularis muscles showed the largest moment arms compared to superior subregions. These findings support distinct functional roles of the rotator cuff muscle subregions.
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