A prosthetic ankle having an elongated tubular shank, which provides bending. The shank is part of a monolithic ankle with the lower portion being a flexure joint. The flexure joint has a flexing post defined by an entrapment kerf. The entrapment kerf allows relatively free movement of flexure within...http://www.google.fr/patents/US4792340?utm_source=gb-gplus-shareBrevet US4792340 - Prosthetic ankle
