Abstract: A bone resection apparatus may comprise a roughly planar blade body that has a tip saw blade and that carries out cutting of bone with which the tip saw blade makes contact as a result of high-speed oscillation; and a guide plate which has a roughly planar tip guide portion, which is located at a top side of the blade body, and which is connected in such fashion as to permit sliding in a front-and-back direction relative to the blade body, the guide plate being capable of sliding between a protruding guide state in which the tip guide portion is made to protrude toward the tip to a point beyond the tip saw blade of the blade body to cover the tip saw blade and to guide a location in a thickness direction at which cutting by the tip saw blade occurs, and a retracted guide state in which the tip guide portion is retracted to a point behind the tip saw blade.

Abstract: A bone resection apparatus may comprise a roughly planar blade body that has a tip saw blade and that carries out cutting of bone with which the tip saw blade makes contact as a result of high-speed oscillation; and a guide plate which has a roughly planar tip guide portion, which is located at a top side of the blade body, and which is connected in such fashion as to permit sliding in a front-and-back direction relative to the blade body, the guide plate being capable of sliding between a protruding guide state in which the tip guide portion is made to protrude toward the tip to a point beyond the tip saw blade of the blade body to cover the tip saw blade and to guide a location in a thickness direction at which cutting by the tip saw blade occurs, and a retracted guide state in which the tip guide portion is retracted to a point behind the tip saw blade.

Abstract: An apparatus in a total knee replacement and arthroplasty operation for measuring a joint gap and ligament balance between a osteotomized surface at a femoral distal end and a osteotomized surface at a tibial proximal end. The apparatus is provided with a base 10, from which an engaging plate 14 extends by way of an arm, so that the engaging plate 14 contacts with the osteotomized surface at the tibial proximal end. A moving body 18 is vertically movably connected to the base 10, from which moving body 18 an arm 20 extends, to which arm a supporting plate 22 is rotatably mounted about a central axis. The supporting plate 22 has, at its top surface, a projected portion 48. to which an auxiliary guiding piece 50 is connected under a snap like fitted manner. A femoral component 52 is mounted, at its groove portion 54, to the osteotomized surface at the femoral distal end.

Abstract: An apparatus in a total knee replacement and arthroplasty operation for measuring a joint gap and ligament balance between a osteotomized surface at a femoral distal end and a osteotomized surface at a tibial proximal end. The apparatus is provided with a base 10, from which an engaging plate 14 extends by way of an arm, so that the engaging plate 14 contacts with the osteotomized surface at the tibial proximal end. A moving body 18 is vertically movably connected to the base 10, from which moving body 18 an arm 20 extends, to which arm a supporting plate 22 is rotatably mounted about a central axis. The supporting plate 22 has, at its top surface, a projected portion 48. to which an auxiliary guiding piece 50 is connected under a snap like fitted manner. A femoral component 52 is mounted, at its groove portion 54, to the osteotomized surface at the femoral distal end.