Abstract: The invention relates to a hip joint endoprosthesis system, comprising a medical instrument for extracting an implanted prosthesis stem of a hip joint endoprosthesis from a femur bone of a patient, which medical instrument has a coupling body with a coupling recess for accommodating a coupling cone protruding from the prosthesis stem, wherein the coupling body comprises a coupling base body and a coupling insert which is accommodated in a coupling insert receptacle of the coupling base body and defines the coupling recess.

Abstract: The invention relates to a hip joint endoprosthesis system, comprising a medical instrument for extracting an implanted prosthesis stem of a hip joint endoprosthesis from a femur bone of a patient, which medical instrument has a coupling body with a coupling recess for accommodating a coupling cone protruding from the prosthesis stem, wherein the coupling body comprises a coupling base body and a coupling insert which is accommodated in a coupling insert receptacle of the coupling base body and defines the coupling recess.

Abstract: A medical force measuring system is provided for measuring a force effective between two prosthesis parts that are connected to one another in articulated manner in a joint prosthesis which includes a ball joint or a partial component thereof. The force measuring system includes a measuring instrument which has a sample joint element with a sample joint surface. The sample joint element is formed in correspondence with a first joint element that forms a part of the ball joint and has a joint surface which is formed in correspondence with the sample joint surface and is moveable into engagement therewith for forming a sample ball joint. The measuring instrument also includes at least one of a measuring device and an indicating device which cooperates with the sample joint element for measuring and/or indicating a force (or a partial component thereof) effective on the sample joint surface.

Abstract: A medical force measuring system is provided for measuring a force effective between two prosthesis parts that are connected to one another in articulated manner in a joint prosthesis which includes a ball joint or a partial component thereof. The force measuring system includes a measuring instrument which has a sample joint element with a sample joint surface. The sample joint element is formed in correspondence with a first joint element that forms a part of the ball joint and has a joint surface which is formed in correspondence with the sample joint surface and is moveable into engagement therewith for forming a sample ball joint. The measuring instrument also includes at least one of a measuring device and an indicating device which cooperates with the sample joint element for measuring and/or indicating a force (or a partial component thereof) effective on the sample joint surface.

Abstract: A plate arrangement for the osteosynthesis of fractured tubular bones is made of two plate sections each connectable to associated bone sections or fragments by fastening screws passing through the plate parts. The plate parts are slidable relative to one another by means of a telescope arrangement connecting the two parts, and holes formed in the two parts for attaching the parts to bone sections or fragments are elongated in the direction perpendicular to the telescope axis to allow fastening screws to be inserted at different angles allowing the surgeon some choice in selecting a most favorable position at which to insert each screw into the associated bone fragment.