PURPOSE: This study provides an insight on the extent of muscular variability at the suprascapular notch and elaborates on its anatomical interference in suprascapular nerve arthroscopic decompression procedures. METHODS: The suprascapular notch was dissected and its muscular topography was observed in 115 cadaveric specimens. High resolution imaging of the suprascapular notch was captured by a handheld digital microscope (Q-scope). The supraspinatus and subscapularis muscles were traced as they course at the suprascapular notch vicinity. The omohyoid muscle attachment onto the suprascapular ligament was measured. A scoping review and meta-analysis were done to investigate the observed rare muscular variants. RESULTS: In 3.48%, the suprascapular notch anterior surface was fully covered by the subscapularis muscle. The omohyoid muscle inserted onto the suprascapular ligament in 31.25% and extended up to 3/4th of the suprascapular ligament length in 2.61%. Two rare variant muscles were encountered: subclavius posticus muscle and a newly reported "coracoscapularis muscle". CONCLUSIONS: Four categories of muscles with topographical relationship to the suprascapular notch and its arthroscopic feasibility have been classified: (1) constant muscles not intervening with the suprascapular notch space - supraspinatus muscle; (2) constant muscles with variable positions that can intervene with the suprascapular notch space - subscapularis muscle; (3) constant muscles with variable positions that can intervene with the surgical approach - omohyoid muscle; (4) variable muscles intervening with the suprascapular notch space and surgical approach - subclavius posticus and coracoscapularis muscles. This study elucidates the necessity to assess/secure the omohyoid muscle attachment onto the suprascapular ligament in suprascapular nerve decompression ligamentectomy. LEVEL OF EVIDENCE: V Basic Science Research.

• Klíčová slova
• Coracoscapularis, Omohyoid, Subclavius Posticus, Subscapularis, Suprascapular nerve entrapment, Suprascapular notch arthroscopy,
• MeSH
• anatomická variace * MeSH
• artroskopie * metody   MeSH
• chirurgická dekomprese metody   MeSH
• kosterní svaly * anatomie a histologie   MeSH
• lidé MeSH
• lopatka inervace   anatomie a histologie   MeSH
• mrtvola MeSH
• studie proveditelnosti MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• metaanalýza MeSH
• scoping review MeSH

• MeSH
• lidé MeSH
• lopatka diagnostické zobrazování   MeSH
• magnetická rezonanční tomografie MeSH
• úžinové syndromy * diagnostické zobrazování   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• dopisy MeSH
• komentáře MeSH
• práce podpořená grantem MeSH

• Publikační typ
• časopisecké články MeSH

• Publikační typ
• úvodníky MeSH