Abstract: Given is a knee-joint endoprosthesis that displays a femur part with convexly-curved condylar cups, and a tibia part with a tibia plateau insert displaying correspondingly, concavely-curved tip surfaces. A connecting part projects with one end into an intermediate space between the condylar cups, is pivotably connected there with the femur part by means of a transverse bolt, and at the other end has a pin that is rotatably journaled in a boring passing through the tibia plateau. To realize, in the case of this axle knee, a bending movement with additional rolling movement components, the pin of the connecting part is journaled in impact-free, axially-displaceable fashion, and the condylar cups approximate a rotation surface about a condylar cup axis that runs above and parallel to the axis of the transverse bolt.

Abstract: A cementable thigh section of an acetabular prosthesis that has a shaft tapering toward its lower end, and on whose upper end is formed a flange-like support collar. Disposed in removable fashion below the support collar is an elastic spacer ring that at least partially covers the support collar. Worked in from the upper end of the thigh section is a boring that preferably branches out into branch borings, that comes out from the thigh section in the upper shaft portion, and serves for bringing the bone cement into the intermediate space between bone wall and thigh section after the thigh section is emplaced in the bone cavity.

Abstract: Presented is an arrangement for coupling two rod-shaped prosthesis sections that displays a clamping sleeve having at its ends contrarotating internal threads that can be screwed with corresponding external threads of the prosthesis sections. To prevent loosening of the connection, the free ends of the prosthesis sections are provided with complementary, sloping contact surfaces which, when tightening the clamping sleeve, produce a loaded diagonal thrust and thereby place the screw couplings under load.

Abstract: A thigh section having a top end carrying a ball joint element for a femoral prosthesis, including bone nails of different lengths and cross-sections which are selected upon the particular patient femur, and that can be firmly joined with the thigh section by coupling elements. The thigh section may be introduced, into the marrow space of the patient, cement-free and anchored to the bone by two transverse screws in compression/tension fashion.

Abstract: Presented is a hip cup for a hip joint acetabular prosthesis that includes a metallic outer cup and a cup body made of plastic inside the outer cup. To guarantee a movement- and deformation-free attachment of the cup body, the cup body is enclosed in tightly fitting fashion, toward the outer cup, by a metallic jacket, and the insert formed of cup body and jacket can be anchored in the outer cup in tightly fitting fashion with at least one attaching element.

Abstract: Given is a device for cutting a thread in a cup-shaped bone, in particular in the acetabulum of a human pelvis bone, which includes a cutter holder on a drive shaft, with a radially, outwardly directed cutting blade being disposed on the cutter holder. In order to cut, in simple fashion, a correctly dimensioned threading into the bone tissue with a desired depth of cut, the device includes a cutter gauge capable of being fixed in the cup space, with the cutter gauge having a central boring and an open cutting channel running spirally about the longitudinal axis of the boring. The cutter holder is capable of being introduced centrally into the boring of the cutter gauge and is capable of being set into a forcefully guided, spiral cutting movement with introduction of the blade into the cutting channel, during the course of which the cutting blade cuts the thread precisely in the bone tissue.

Abstract: Given a hip joint femoral prosthesis having a shaft, a spherical head and a connecting part between the shaft and the head. Disposed at the proximal end of the shaft and in the head in each case is a conical boring. Located at the shaft side end and at the head side end of the connecting part is a socket cone cooperating with each conical boring. The longitudinal axis of the first socket cone and the longitudinal axis of the second socket cone of the connecting part intersect at a predetermined angle 0.ltoreq..beta..ltoreq.50.degree. (zero is less than or equal to beta and beta is less than or equal to 50.degree.), in order to be able to adapt better the relative position of the head to the shaft, individually, to the conditions of the patient.

Abstract: Presented is a hip cup for a hip joint acetabular prosthesis comprising an outer cup having a hemispherical or truncated cone external form and an inner hemispherical cup that is capable of being inserted into the outer cup. Running externally about the outer shell is a self-cutting thread for cementless anchoring of the hip cup, the outer diameter of which is approximately constant over the entire axial length of the thread.