The Imperial Knee is a 3D printed plastic alternative that is affordable and accessible to developing countries; allowing people to take control of their disability, instead of relying on donations or test products.

This polycentric knee joint is made from modular, inexpensive components with bearings and parts that can be found in local repair shops, and easily repairable with minimal training required. Initial tests surpassed the desired stress requirements, permitting future R&D.

After conducting field research from hospitals in Tanzania, we were able to identify areas for development such as slimmer geometry, quieter joints, as well as improving the swing and feel of the resulting gait produced from the mechanism.

Project completed at:

Imperial College London

Royal College of Art


Jaime Garcia (PM)

Grigoris Grigoriadis (Supervisor)


Research and Development

Mechanical Engineering

Rapid prototyping


5 months, 2018

Douglas Mann

© 2020 Douglas Mann