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3D Printed vs. Traditional Finger Orthoses: A Force Comparison
Clarisse Humbert1, Renaud Nicod1, Thomas Lamartine1
1Université Marie et Louis Pasteur, ISIFC, Biotika, 51 Avenue de l'Observatoire, 25000 Besançon, France.
Indian Journal of Orthopaedics
|February 11, 2026
Summary
Commercial finger orthoses offer superior mechanical reliability compared to a 3D-printed model. The 3D-printed device, while customizable, showed lower resistance, highlighting areas for future design improvements in rehabilitation technology.
Area of Science:
- Biomedical Engineering
- Rehabilitation Technology
- Orthotics and Prosthetics
Background:
- Dynamic flexion or extension orthoses for the proximal interphalangeal joint (PIP) are crucial in post-trauma rehabilitation.
- These devices aim to restore and enhance finger mobility.
- Comparing the biomechanical performance of different orthosis types is essential for optimizing patient outcomes.
Purpose of the Study:
- To compare the biomechanical performance of two commercial PIP extension orthoses (sizes S and L) against a 3D-printed orthosis.
- To evaluate mechanical resistance and deformation under varying loads.
- To assess the suitability of 3D-printed orthoses for clinical rehabilitation applications.
Main Methods:
- Biomechanical testing of orthoses under increasing loads (0-1500 g).
- Measurement of angular displacements using a specialized experimental setup.
- Modeling of exerted forces based on simplified geometric assumptions.
Main Results:
- The 3D-printed orthosis demonstrated limited mechanical resistance, failing at 700 g.
- Commercial orthoses exhibited excellent fatigue resistance with minimal angular displacement (<0.1°).
- The 3D-printed orthosis showed higher deformability, indicated by a steeper stress-strain curve (13.9°N⁻¹).
Conclusions:
- Commercial orthoses provide superior mechanical reliability for PIP joint rehabilitation.
- The current 3D-printed orthosis design requires significant improvements in durability.
- Future iterations could benefit from multi-material components and integrated force sensors for enhanced performance and customization.
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