New parameters describing morphological variations in the suprascapular notch region as potential predictors of suprascapular nerve entrapmentReportar como inadecuado




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BMC Musculoskeletal Disorders

, 15:396

Orthopedics and biomechanics

Abstract

BackgroundThe suprascapular notch SSN, bridged by the superior transverse scapular ligament STSL, creates a pathway for the suprascapular nerve SN. Morphological variations in the SSN region are common and can increase the risk of neuropathy by constricting the space for the nerve. The aim of this study was to establish new objective parameters that take this complex morphology into account.

MethodsThe SSN region of 100 formalin-fixed cadaveric shoulders was dissected. The dimensions of the SSN, the STSL and the anterior coracoscapular ligament ACSL, as well as diameters of the SN, associated vessels and SN passage area, were measured by means of quantitative visual data analysis software to assign those structures to present classifications. The area reduction coefficient ARC and the ambit occupation coefficient AOC were defined and calculated for each shoulder.

ResultsThe mean ARC and AOC for ligaments in the suprascapular region were: ARCSTSL = 71.6%, ARCACSL = 9.6%, AOCSTSL = 56.8% and AOCACSL = 9.1%. The SN passage area, ARC and AOC did not differ significantly between SSN types. The SN passage area and ARC differed significantly between band- and fan-shaped types of STSL. A significant relationship was observed between ARC and AOC R = 0.6855; p < 0.0001. The SN passage area correlated significantly with ARC R = -0.7555; p < 0.0001 and AOC R = -0.5609; p < 0.0001.

ConclusionsThe proposed parameters convey the complex morphology of the SSN region in a quantitative manner. The area reduction coefficient seems to be a more relevant indicator than the AOC as it better correlates with the SN passage area. Contrary to the SSN type, the STSL type significantly influences SN passage area and ARC.

KeywordsSuprascapular nerve entrapment Superior transverse scapular ligament Suprascapular notch Suprascapular foramen Electronic supplementary materialThe online version of this article doi:10.1186-1471-2474-15-396 contains supplementary material, which is available to authorized users.

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Autor: Michał Podgórski - Mirosław Topol - Marcin Sibiński - Piotr Grzelak - Ludomir Stefańczyk - Michał Polguj

Fuente: https://link.springer.com/







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