Abstract: An osteosynthesis device having a bone screw, particularly a pedicle screw, a fork head that has a groove and a corrective pin seated in the groove of the fork head. A corrective pin is secured against twisting in that the bottom of the groove of the fork head is provided with a plurality of longitudinal slots lying parallel to one another.

Abstract: In an orthopedic surgical holding device for a correcting rod, having a bone plate which can be fastened on the bone, a receiver device for the correcting rod and a fixing device maintaining the correcting rod in the receiver device. An optimal transfer of the occurring forces and moments is achieved in that the bone plate can be fixed independently of the receiver device (10) and has a bearing for the receiver device, and in that the receiver device can be pushed into the bearing from the proximal side and in the course of this extends through the bone plate and extends beyond it on the distal side for receiving the correcting rod.

Abstract: In a bone surgery holding device for a fixing rod, with a bone plate, which can be fastened to the bone, a receiving device, and a fixing device, which secures the fixing rod in the receiving device, the bone plate has a contact face essentially made to fit the surface of the bone and the fixing rod can be inserted into the receiving device.

Abstract: An endoprosthesis for a knee joint comprising a femur part (6), a tibia part (8), and a middle part (18) which is articulated on the femur part (6) by a pin (14). The middle part (18) is pivotable with respect to the tibia part (8) about a centering pin (20), and a stop is pivoted which is dependent on the flexion angle. A bearing part (54), acting as artificial meniscus, is arranged between the femur part (6) and the middle part (18), and has a first guide element (56) coaxial to the flexion axis and in engagement with the bearing member (58) of the femur part (6). The bearing part (54) is displaceable with respect to the middle part (18) and also comprises a second guide element (60) in engagement with a guide track (62) of the middle part (18); the pin (14) is arranged eccentric to the bearing member (58), and movement of the flexion axis is forced along an evolute curve. The invention avoids localized load peaks while accomplishing the physiological functions of the knee joint during movement and load.

Abstract: Apparatus for the working of a bone, especially the femur head of a human hip joint, wherein the a is to be provided with a shell-shaped endoprosthesis, is disclosed. The apparatus includes a drivable drive shaft having a free end and a pot-shaped cutting head being arranged on the free end of the drive shaft. The cutting head is open outwardly and has a guiding bore forming part of the cutting head and is centrally located thereon. The guiding bore extends in an axial direction of the drive shaft. The cutting head has an inner end face and a jacket portion on which cutting elements are arranged. Finally included is a guiding pin for cooperating with the guiding bore. The guiding pin is arranged centrally in the bone section to be treated and protrudes from the bone surface. Additional central cutting means arranged on the cutting head are disclosed.

Abstract: An endoprosthesis for a hip joint is disclosed. The endoprosthesis includes a first cap-shaped, femur head shell which is arranged on the free end of the femur head and partially overlaps the femur head. The first femur head shell has a convex outer side. A shell-shaped pan forms part of the prosthesis which has a concave inner side for supporting the first femur head shell. The pan is arranged on the free end of the acetabulum. A second cap-shaped femur head shell is included which extends outwardly beyond the edge of the first femur head shell. The second femur head shell is arranged between the first femur head shell and the femur head. The various features of the shells and pan are disclosed.

Abstract: Apparatus is disclosed for producing relief grooves in pan-shaped bones, especially in the acetabulum of a human hip joint. The apparatus includes a drivable drive shaft having a free end section. A casing is arranged on the free end section. The casing has an exterior contour which, facing away from the drive shaft is, at most, as large as the pan-contour of the bone. At least one cutting device is arranged in the casing which is movable transversely relative to the longitudinal axis of the drive shaft. The cutting device has a cutting edge arranged in an outwardly radial direction. An adjusting device is included which cooperates with the cutting device. The cutting edge is arranged in an initial position within the casing and is radially movable outwardly by means of the adjusting device.

Abstract: An apparatus for producing a conical, outwardly tapering surface on a bone, especially on a cylindrically pre-worked femur head of a human hip joint. The apparatus includes a drive shaft having a free end. A knife-type cutting device is arranged at the free end of the drive shaft, wherein the cutting device has an inner edge. An adjusting device is included for moving the inner cutting edge of the cutting device from an initial position essentially parallel to the longitudinal axis of the drive shaft to a position forming an acute angle relative to the longitudinal axis. The cutting edge of the cutting device is radially outwardly offset relative to the longitudinal axis of the drive shaft. In the initial position, the extent of radial offsetting is at least as great as half the diameter(r) of the bone section to be treated.

Abstract: A knee joint prosthesis has a femur part and a tibia part which are pivotable relative to one another about a joint-flexing axis. One of the parts is rotatable about an axis perpendicular to the flexing axis. An eccentric member, the angular position of which is determined by the degree of joint flex, engages a pair of abutments on the rotatable part so that rotation is only possible when the joint is flexed with the angle of rotation being determined by the size of the gap between the abutments and eccentric member when the joint is in its flexed position.