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Mechanical, structural, and physiologic differences between above and below-knee human arteries.

Pauline Struczewska1, Sayed Ahmadreza Razian1, Kaylee Townsend2

  • 1Department of Biomechanics, University of Nebraska Omaha, Omaha, NE, USA.

Acta Biomaterialia
|February 2, 2024
PubMed
Summary

Below-knee arteries in Peripheral Artery Disease are smaller, stiffer, and structurally different from above-knee arteries. This study reveals key biomechanical variations to improve medical device development for PAD.

Keywords:
Femoropopliteal arteryInfrapopliteal arteriesMechanical propertiesStructural characteristicsTibial arteries

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Area of Science:

  • Biomechanics
  • Vascular Biology
  • Biomaterials

Background:

  • Peripheral Artery Disease (PAD) impacts lower extremities, with poorer outcomes below the knee.
  • Limited mechanical and structural data exist for tibial vessels, hindering effective treatment.

Purpose of the Study:

  • To compare biomechanical and structural properties of above-knee femoropopliteal arteries (FPA) and below-knee infrapopliteal arteries (IPA).
  • To understand segment-specific differences for improved Peripheral Artery Disease treatment and medical device design.

Main Methods:

  • Compared SFA/PA (FPA) to AT/PT/FA (IPA) from 15 human subjects.
  • Utilized micro-CT imaging, biaxial mechanical testing, and constitutive modeling.
  • Assessed vessel composition: elastin, collagen, SMCs, and GAGs.

Main Results:

  • Infrapopliteal arteries were smaller, thinner, and stiffer longitudinally than femoropopliteal arteries.
  • Infrapopliteal arteries experienced higher longitudinal and lower circumferential stresses.
  • Infrapopliteal arteries had less elastin, collagen, and GAGs but similar SMC content.

Conclusions:

  • Significant biomechanical and structural differences exist between above- and below-knee arteries.
  • These findings are crucial for developing location-specific medical devices and treatments for Peripheral Artery Disease.
  • Understanding these variations can enhance clinical management and patient outcomes in PAD.