Patent ID: 7588603

Claim:
An implantable orthesis for knee arthrodesis comprising a femoral implant containing a femoral rod adapted to be able to be introduced into the medullary canal of the femur, a tibial implant comprising a tibial rod adapted to be able to be introduced into the medullary canal of the tibia, the femoral implant having a proximal fixing end adapted to be able to cooperate with a conjugate proximal fixing end of the tibial implant so as to form a rigid fixing of the two implants relative to one another allowing peripheral bone reconstruction between the tibia and the femur and around these proximal fixing ends, wherein: the tibial implant has a proximal tibial anchoring head of a shape which is without symmetry of revolution and splayed in a front plane from the tibial rod, this tibial anchoring head being adapted to be able to be introduced into a splayed cavity of forms made in the proximal end of the tibia, this tibial anchoring head having a proximal end forming the widest portion of the tibial implant and constituting said proximal fixing end; the femoral implant has a proximal femoral anchoring head of a shape which is without symmetry of revolution and splayed in a front plane from the femoral rod, this femoral anchoring head being adapted to be able to be introduced into a splayed cavity of conjugate forms made in the proximal end of the femur, this femoral anchoring head having a proximal end forming the widest portion of the femoral implant and constituting said proximal fixing end; the tibial and femoral anchoring heads have a front splay angle at a top of a trapezium which defines a front axial section of the tibial and femoral anchoring heads of between 20 degrees and 45 degrees, and at least one of the anchoring heads is of splayed shape in a sagittal plane from the corresponding tibial or femoral rod, with a sagittal splay angle less than the front splay angle such that the proximal fixing end has a lower sagittal depth than a front width.