AI Article Synopsis

  • The study aimed to assess the mechanical properties of hamstring muscles from cadaveric specimens using ultrasound shear wave elastography (SWE), particularly focusing on those with knee flexion contractures.
  • Hamstring muscle samples were tested for tensile strength, measuring the shear modulus and Young's modulus through a series of experiments involving strain and load application.
  • Results indicated that hamstring muscles with flexion contractures showed significantly higher Young’s and shear moduli, suggesting they are stiffer and more resistant to elongation compared to muscles without contractures.

Article Abstract

Purpose: This study used ultrasound shear wave elastography (SWE) to evaluate the mechanical properties of hamstring muscles from cadaveric specimens with knee flexion contractures.

Methods: Hamstring muscles for tensile testing were harvested from Thiel soft-embalmed cadavers with and without knee flexion contracture. Muscle specimens were mounted on a testing machine. The initial load detected when a tensile load was applied to the distal end was used as the slack length. The cross-sectional areas of the muscle at slack length were measured at the proximal and distal sites using B-mode ultrasonography. Subsequently, the muscle specimen was elongated from the slack length to 8% strain, with the shear modulus measured using SWE. Young's modulus (stress/strain) was calculated based on the displacement and tensile force obtained from the tensile test.

Results: Regression analysis showed a significant positive linear relationship between the Young's and shear moduli for all specimens at all the sites (P < 0.01 and coefficient of determination: 0.95-0.99). The Young's and average shear moduli at the proximal and distal sites were higher in all hamstring muscles with contractures than in those without contractures.

Conclusions: SWE can be used to estimate Young's moduli of hamstring muscles with contractures. Muscle specimens with contractures exhibited higher resistance to elongation, thereby indicating that their mechanical properties differed from those of muscles without contractures.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11442639PMC
http://dx.doi.org/10.7759/cureus.68343DOI Listing

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