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Related Experiment Video

Updated: Jul 2, 2026

A Flexible Wearable Supernumerary Robotic Limb for Chronic Stroke Patients
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Innovative 3D-printed internal structure in silicone partial-hand prostheses: Enhancing function and mechanical

M Mohammad Zadeh1, M Jalali1, A Khaghani1

  • 1Rehabilitation Research Center, Department of Orthotics and Prosthetics, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.

Canadian Prosthetics & Orthotics Journal
|July 1, 2026
PubMed
Summary

This study introduces a novel 3D-printed silicone cosmetic prosthesis for partial hand amputation, significantly improving weight, stiffness, and user satisfaction. The new design enhances functional ability and durability compared to traditional prostheses.

Keywords:
3D PrintingAmputationCosmetic ProsthesisFunctional AbilityPartial HandSatisfactionSilicone

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Rehabilitation Medicine

Background:

  • Silicone cosmetic prostheses aid body image for partial hand amputees but are often heavy and lack stiffness.
  • Addressing these limitations is crucial for improving patient quality of life and prosthesis efficacy.

Purpose of the Study:

  • To design and evaluate a novel silicone cosmetic prosthesis with a 3D-printed internal structure for improved lightweight and durability.
  • To assess the impact of this new prosthesis on user satisfaction and functional ability.

Main Methods:

  • A pilot study involving 7 participants with unilateral partial hand amputation.
  • Fabrication of silicone prostheses with internal 3D-printed thermoplastic polyurethane (TPU) structures.
  • Evaluation using TAPES (satisfaction) and DASH (function) questionnaires, alongside mechanical tests for stiffness and fatigue resistance.

Main Results:

  • The 3D-printed TPU prosthesis was significantly lighter, stiffer, and more fatigue-resistant than conventional full-silicone prostheses.
  • Participants reported superior functional ability (lower DASH scores) and higher satisfaction (TAPES scores) with the new prosthesis.
  • Increased daily wear time was observed with the TPU-integrated prosthesis.

Conclusions:

  • Silicone prostheses with 3D-printed internal TPU structures show promise for improved mechanical properties and functionality.
  • This innovative design offers a potential advancement in cosmetic partial-hand prosthetics.
  • Further research with larger sample sizes is recommended to validate these preliminary findings.