Mechanical static loading testing rig for forearm crutches
Product testing tool (Static loading properties)
Overview
This open-source testing rig allows for easy, replicable static loading testing setup for mobility aid, in this case, forearm crutches. Its configuration replicates realistic biomedical loading conditions during device use, thanks to a combination of custom 3D-printed parts and accessible off-the-shelf components simulating a hand, wrist joint, forearm, and elbow joint. The assembly can be connected to hydraulic presses to conduct tests, also according to testing standards, e.g., ISO 11334:2007 (Assistive products for walking manipulated by one arm — Requirements and test methods - Part 1: Elbow crutches). By enabling accessible product testing, this tool facilitates product development and replication assessment in distributed manufacturing contexts. 1
Romani, A., Nansubuga, R.K., Woods, M., Reeves, J., Pearce, J.M. 2026. ** Open source testing rig for mechanical static loading test of forearm crutches.** Project repository. Available at OSF.io. DOI: 10.17605/OSF.IO/6EB2T
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Licenses:
- Hardware: GPL-3.0-Only (More info)
- Software: GPL-3.0-Only (More info)
- Documentation: GPL-3.0-Only (More info)
Materials and Tools
- ⚙️ CAD / Parametric modeling: Fusion 360 (CAD modeling tools) 2
- 🔩 Slicing and fabrication (custom components): PrusaSlicer 3 , Small-format Fused Filament Fabrication 3D Printer.
- 📎 Materials: PETG filaments tested for rigid parts and recommended.
- 🔩 Additional off-the-shelf: Steel mounting plate, tube, threaded ball joints, threaded rod, connecting rod, and nuts (Please refer to the documentation in the repository).
Fusion 360. Available at: https://www.autodesk.com/products/fusion-360/overview
PrusaSlicer. Available at: https://www.prusa3d.com/page/prusaslicer_424/
Publications
Alessia Romani*, Rebecca Kaaya Nansubuga, Maryam Mottaghi, Danielle Munang, Emily Bow Pearce, Pooja Viswanathan, Thomas Jenkyn, Tarek Loubani, Jacob M. Reeves, Joshua M. Pearce
MedRxiv, 2026 Feb