Subscapularis minor-does it exist?
Cadaveric study
Fatty infiltration
Irreparable subscapularis
Rotator cuff muscle
Subscapularis minor
Subscapularis muscle
Journal
International orthopaedics
ISSN: 1432-5195
Titre abrégé: Int Orthop
Pays: Germany
ID NLM: 7705431
Informations de publication
Date de publication:
02 2022
02 2022
Historique:
received:
30
08
2021
accepted:
24
11
2021
pubmed:
3
12
2021
medline:
11
3
2022
entrez:
2
12
2021
Statut:
ppublish
Résumé
It has been well established that the subscapularis is divided in two different parts with a tendinous insertion at its superior two-thirds and a muscular attachment on its inferior third. The objective of this cadaveric study was to follow the muscular insertion of the subscapularis medially in order to determine the origin of this inferior muscle insertion and whether a subscapularis minor can be individualized MATERIALS AND METHODS: Twenty-six shoulders from thirteen fresh-frozen cadaveric specimens (5 males and 8 females; mean age, 74.4 years) were dissected in our anatomy lab. The humeral insertion of the subscapularis was then analyzed, and the inferior muscular part of the insertion was identified. The muscle fibers were followed medially until their scapular origin which was recorded as line drawings and photographs. We measured the dimensions of both the humeral insertion and of the scapular origin of the fibers going to the muscular portion. In all cases, the fibres going to the tendinous portion and those going to the muscular portion of the insertion had a different orientation. The fibres going to the muscular portion of the humeral insertion did not originate from the subscapularis fossa but on the glenoid neck and in a depression at the infero-lateral part of the scapular pillar. The mean length of the superior tendinous portion of the humeral insertion was 3.42 cm (± 0.43 cm); the mean length of the inferior muscular portion of the humeral insertion was 1.88 cm (± 0.80 cm). The mean length of the scapular origin in the depression at the infero-lateral part of the scapular pillar of the fibres going to the muscular portion of the humeral insertion was 3.7 cm (± 0.17 cm). The fibres of the subscapularis do not all originate from the subscapularis fossa. An additional origin exists at the inferior part of the glenoid neck and in a depression at the infero-lateral part of the scapular pillar. The fibers which originate at this location all insert on the humerus at the muscular portion of the subscapularis humeral insertion. This portion however does not seem to correspond to the so-called subscapularis minor which has been previously described.
Identifiants
pubmed: 34854937
doi: 10.1007/s00264-021-05275-z
pii: 10.1007/s00264-021-05275-z
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
291-299Informations de copyright
© 2021. The Author(s) under exclusive licence to SICOT aisbl.
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