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Numerical Analysis of a Transtibial Prosthesis Socket Using 3D-Printed Bio-Based PLA.

Vasja Plesec1, Jani Humar1, Polona Dobnik-Dubrovski2

  • 1Laboratory for Intelligent CAD Systems, Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia.

Materials (Basel, Switzerland)
|March 11, 2023
PubMed
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This summary is machine-generated.

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3D-printing lower-limb prosthesis sockets using Polylactic Acid (PLA) offers an inexpensive, eco-friendly alternative to traditional methods. This study demonstrates PLA sockets provide comparable safety and stability to composite ones, reducing waste and cost.

Area of Science:

  • Biomaterials Engineering
  • Additive Manufacturing
  • Prosthetics and Orthotics

Background:

  • Traditional lower-limb prosthesis manufacturing relies on costly, non-recyclable composite materials and labor-intensive trial-and-error methods.
  • These conventional processes lead to significant material waste, extended production times, and high costs for prosthetic devices.

Purpose of the Study:

  • To investigate the feasibility of using Fused Deposition Modeling (FDM) 3D-printing with Polylactic Acid (PLA) for developing and manufacturing lower-limb prosthesis sockets.
  • To assess the safety and stability of 3D-printed PLA sockets under realistic loading conditions simulating human gait.

Main Methods:

  • Material properties of 3D-printed PLA were characterized through uniaxial tensile and compression tests.
  • A generic transtibial numeric model was employed to simulate socket performance during gait phases (heel strike, push-off) based on ISO 10328 standards.
Keywords:
3D-printingPLAbio-basedfinite element methodnumerical modelpolylactic acidprosthesisprosthetic socket

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  • Numerical simulations compared the stress and deformation of 3D-printed PLA sockets against traditional polystyrene check and composite definitive sockets.

    • Main Results:

    • 3D-printed PLA sockets demonstrated acceptable von-Mises stresses (5.4 MPa at heel strike, 10.8 MPa at push-off).
    • Maximum deformations in PLA sockets (0.74 mm at heel strike, 2.66 mm at push-off) were comparable to those of check sockets (0.67 mm and 2.52 mm, respectively).
    • The analysis confirmed similar stability performance between 3D-printed PLA and traditional sockets.

    Conclusions:

    • Inexpensive, bio-based, and biodegradable Polylactic Acid (PLA) is a viable material for 3D-printing lower-limb prosthesis sockets.
    • This approach offers an environmentally friendly and cost-effective solution for prosthesis manufacturing, addressing limitations of current methods.