Abstract: A bone resection jig that can make ligament tension equal at extension and flexion positions without any actual measurements when resecting femur and tibia during artificial knee joint replacement surgery.

Abstract: A bone resection jig that can make ligament tension equal at extension and flexion positions without any actual measurements when resecting femur and tibia during artificial knee joint replacement surgery.

Abstract: By forming a bone-compatible implant wherein a groove or hole has been formed in the surface of a base material made of titanium metal or a titanium alloy at its joint with a bone tissue and the groove or hole has on the inner surface thereof an oxide film formed by heating in an oxygen-containing atmosphere, apatite is allowed to deposit on the inner surface of the groove or hole easily. Thus, an implant is provided which can be attached to a bone within a relatively short period of time even without resorting to bone cement.

Abstract: A shock absorbing structure having a high shock absorption characteristic is provided. The shock absorbing structure includes a solidified portion and a sintered portion. The solidified portion is formed by dissolving and solidifying a plurality of inorganic powder particles. The sintered portion is formed by sintering a plurality of the inorganic powder particles. The sintered portion is connected to the solidified portion. The shock absorbing structure is a composite structure including the solidified portion and the sintered portion and therefore has a high shock absorption characteristic.

Abstract: A surgical assistance system for operating on biological tissue using a surgical tool attached to an arm of an automatically-controlled surgical instrument so that an optimal feed rate of the tool is calculated and outputted to the surgical instrument, the system including: a device for storing and voxelizing medical image data obtained from a biological tissue subject to surgery; a device for setting an operative location based on the shape of the biological tissue; a device for calculating a tool path along which the tool travels to perform surgery at an operative location; a device for determining the region of interference between the tool and the voxels; a device for determining the hardness of the biological tissue in the interference region; a device for calculating an optimal tool feed rate corresponding to the hardness; and a device for outputting the feed rate obtained by the calculations to the surgical instrument.

Abstract: An artificial knee joint including a femoral component and a tibial component which are in relation of making relative rotation, in which the tibial component has a post that has an outwardly curving posterior surface and is disposed approximately in the longitudinal center between the articular surfaces so that the post is inside an intercondylar groove that is between the medial and lateral condyles and extends from the posterior end to the anterior end of the femoral component; and the femoral component has a cam that is disposed at the posterior portion of the intercondylar groove and comes into contact with the posterior surface of the post when the above-described rotation proceeds; and the post and the cam are shaped so that the femoral component is turned outwardly when the cam comes into contact with the post as a result of the rotation and as the rotation proceeds.

Abstract: By forming a bone-compatible implant wherein a groove or hole has been formed in the surface of a base material made of titanium metal or a titanium alloy at its joint with a bone tissue and the groove or hole has on the inner surface thereof an oxide film formed by heating in an oxygen-containing atmosphere, apatite is allowed to deposit on the inner surface of the groove or hole easily. Thus, an implant is provided which can be attached to a bone within a relatively short period of time even without resorting to bone cement.

Abstract: An artificial knee joint including a femoral component to be attached to a femur and a tibial component to be attached to a tibia, wherein in the femur component a medial condyle thereof is thicker than a lateral condyle thereof; in the tibial component, a medial articular surface thereof, which supports the medial condyle of the femur component, is thinner or deeper than a lateral articular surface thereof, which supports the lateral condyle of the femur component; and a joint line joining the lowest points of contact surfaces between the medial and lateral condyles of the femur component and the medial and lateral articular surfaces of the tibial component in a longitudinal cross section in a medial-lateral direction is inclined inward at virtually the same angle over the entire region of an angle of flexion-extension.

Abstract: An artificial knee joint including a femoral component and a tibial component which are in relation of making relative rotation, in which the tibial component has a post that has an outwardly curving posterior surface and is disposed approximately in the longitudinal center between the articular surfaces so that the post is inside an intercondylar groove that is between the medial and lateral condyles and extends from the posterior end to the anterior end of the femoral component; and the femoral component has a cam that is disposed at the posterior portion of the intercondylar groove and comes into contact with the posterior surface of the post when the above-described rotation proceeds; and the post and the cam are shaped so that the femoral component is turned outwardly when the cam comes into contact with the post as a result of the rotation and as the rotation proceeds.

Abstract: A femoral component of an artificial knee joint that is to be attached to a distal end of a femur having a peg or pegs installed in the inner surface of the femoral component so as to be located in an area of a front half of the femoral component.

Abstract: An artificial knee joint including a femoral component to be attached to a femur and a tibial component to be attached to a tibia, wherein in the femur component a medial condyle thereof is thicker than a lateral condyle thereof; in the tibial component, a medial articular surface thereof, which supports the medial condyle, is thinner than a lateral articular surface thereof, which supports the lateral condyle; and a joint line joining lowest points of contact surfaces between the medial and lateral condyles and the medial and lateral articular surfaces in a longitudinal cross section in a medial-lateral direction is inclined inward at virtually the same angle over the entire region of an angle of flexion-extension.