An inventive prosthetic ankle for use between a pylon and a prosthetic foot to support a person's weight on the ground comprises an integrally formed, generally C-shaped carbon-fiber composite flexure member having upper, lower and curved legs. The upper leg is connected to a lower end of the pylon,...http://www.google.co.uk/patents/US6350286?utm_source=gb-gplus-sharePatent US6350286 - Prosthetic ankle and walking system
