67,5% University of Bologna; 32,5% Istituto Ortopedico Rizzoli
New knee prostheses based on spherical mechanisms. These are orthopaedic devices for either partial, primary or secondary prosthetic knee replacement, with a component on the distal femur, and one on the proximal tibia. In a rather original way, the two prosthetic components are coupled together virtually or physically forming a spherical couple, thus generating together with the help of the preserved ligaments, a spherical movement with only a single degree of movement. This has proven to be an excellent approximation of the natural movement of this joint in passive flexion. The movement may be obtained with different designed solutions, some of which include innovative elements connecting the joint surfaces, these limit (relatively) movement to simple rolling, thus avoiding sliding.