Evidence map›Paper›PMID 39421045›Full record

ArticleOrthopaedic journal of sports medicine2024

Muscle Architecture Properties of the Deep Region of the Supraspinatus: A Cadaveric Study.

Isabella T Wu, Sydnee A Hyman, Mackenzie B Norman, Gabriela Sendek, Jenna J Powell, Tyler N Kirchberg, David B Berry, John G Lane, Anshuman Singh, Samuel R Ward

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Article in Orthopaedic journal of sports medicine, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

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2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

10 authors.

Isabella T WuDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
Sydnee A HymanDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
Mackenzie B NormanDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.ORCID https://orcid.org/0000-0003-4096-4480
Gabriela SendekDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
Jenna J PowellDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
Tyler N KirchbergDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
David B BerryDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
John G LaneDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
Anshuman SinghDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.
Samuel R WardDepartment of Orthopaedic Surgery, University of California, San Diego, San Diego, California, USA.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Background: The supraspinatus is most frequently involved in rotator cuff tears, a common orthopaedic condition. However, the architecture of this muscle has been described only for the superficial, anterior, and posterior regions. Purpose: To determine the muscle architecture of the deep supraspinatus. Study Design: Descriptive laboratory study. Methods: Muscle architecture measurements were collected from 25 cadaveric supraspinatus specimens (13 intact [without tendon tears], 3 with partial-thickness tears, 9 with full-thickness tears). The muscle was divided into deep, superficial anterior, and superficial posterior regions. Pennation angle, raw and normalized fiber length, and sarcomere length and number were compared using repeated-measures analyses of variance. Results: First, mean architecture measurements were compared between regions using only the intact specimens (n = 13). The deep region had a lower mean pennation angle (3.3° ± 1.0°) compared with the posterior region (11.0° ± 3.9°; Conclusion: The deep supraspinatus had significantly lower pennation angles, shorter fiber lengths, and fewer but longer sarcomeres in series compared with other subregions within the muscle. These structural differences suggest a functionally unique "submuscle" within the supraspinatus. Clinical Relevance: Understanding the architecture of the supraspinatus muscle can provide insight into muscle function in health and disease. Specifically, this deep submuscle may play a different role in rotator cuff function than the rest of the muscle.

Indexed as

anatomymuscle architecturerotator cuffsarcomere lengthsupraspinatus

Identifiers

PMID39421045
PMCPMC11483794

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