Abstract: A lower leg prosthetic assembly having an anterior and posterior components, comprising curved linear leaf springs extending along substantially the length of the assembly, each spring bowed away from one another along substantially their mid-length. There is further provided a wedge member for engaging the lower end of each spring while in position in a prosthetic foot, and wedgingly securing the anterior and posterior springs to a prosthetic foot member, for allowing increased rotation at the ankle joint. Further the upper ends of the leaf springs may be secured to the upper portion of the assembly with a wedge member, wedgingly securing the springs to the upper member, or attached to a socket member, both types of attachments for decreasing rotation at the knee joint. There may be further provided an achilles strap extending along the posterior spring for offering additional vertical loading without increased elongation of the rear spring.

Abstract: An ankle joint prosthesis comprises an upper part for attachment to an artificial leg and a lower part for attachment to an artificial foot, with the upper and lower parts rotatively coupled and capable of being fixed in a first position for walking, a second position for swimming, or a free-flexing mode for activities such as skiing or rowing. The upper and lower ankle parts have coaxial bores in which a cam part is mounted by means of two bushings. A pin-and-slot arrangement allows locking of the prosthesis in a desired position. Changing positions takes only seconds, and is effected by rotating a spring-loaded "D"-ring on the side of the ankle prosthesis by hand. In a preferred embodiment the ankle joint prosthesis is completely waterproof and precision machined from a lightweight, high-strength plastic.