Abstract: A bone mill has a pair of cutter units, a first cutter unit and a second cutter unit. A bone to be crushed is taken in between the first cutter unit and the second cutter unit. While passing between the first cutter unit and the second cutter unit, the bone is crushed. Each cutter unit has a plurality of disks disposed in parallel to one another at regular intervals. Each disk is provided on the periphery thereof with blades for crushing the bone. The cutter units are positioned such that the disks of the first cutter unit are fitted in the gaps between adjacent disks of the second cutter unit. Both the disks of the first cutter unit and the disks of the second cutter unit are mutually inwardly rotated. Accordingly, when a bone to be crushed is supplied between the cutter units, the bone is taken in by and between the disks of the first cutter unit and the disks of the second cutter unit, both sets of disks being mutually inwardly rotated.

Abstract: The present invention provides a femoral prosthesis to be utilized as an implant into a human femur to connect the coxa. The femoral prosthesis comprises a stem body to be inserted into a femur bone, a neck portion fixed integrally at the proximal portion of the stem body, a spherical head member having an opening to receive the neck potion, and a cross pin for fixing the stem body to the femur bone, wherein the stem body is formed with a pinnig hole through a proximal portion thereof corresponding to a greater trochanter of the femur bone, and the cross pin is in a unthreaded cylindrical shape and inserted into the pinning hole, both ends of the cross pin being projected out of the stem body to be engaged with the bone wall of the femur bone.