Abstract: A surgical instrument for use in a knee joint replacement operation having a first fastening device, a second fastening device, a guiding device connected at one end to the first fastening device and at the other end to the second fastening device and by which the second fastening device is pivotably movable in a manner guided relative to the first fastening device in a sagittal guiding plane, and an alignment rod configured for alignment with respect to an anterior edge of a tibia. The alignment rod is releasably connected to the second fastening device in a rigid manner.

Abstract: A surgical instrument for use in a total knee arthroplasty includes a first fastening device and a guide device releasably coupled to the first fastening device and configured for releasable coupling to a second fastening device. The guide device has a sliding guide with at least one guide slot extending longitudinally along a guide track and at least one sliding member which is received in the at least one guide slot so as to be slidingly movable along the guide track. The first fastening device has at least one push-fit receiver, by which the at least one sliding member is introduced into the at least one guide slot forming a releasable push-fit connection with the first fastening device.

Abstract: A surgical instrument for use in a knee joint replacement operation includes a fastening device configured for releasably fastening to a femoral trial implant mounted on a distal femur. The fastening device has two positioning pins arranged spaced apart mediolaterally from each other and which, for the purpose of positioning the fastening device, are designed to be able to be plugged in a posterior direction into two receiving bores, complementary to the positioning pins, of the trial implant. The fastening device has at least one fixing element for fixing the fastening device in a form-fitting manner to the trial implant in an anterior direction.

Abstract: A surgical device and surgical system for use in a total knee arthroplasty. The surgical device is configured for aligning an extramedullary alignment rod, and has a supporting portion having at least two supporting geometries. The supporting geometries are each adapted for support on an anterior edge of a tibia. A reference portion projects in an anterior direction from the supporting portion and has at least two reference geometries that are separated from one another along a reference line that extends in a proximodistal direction. The reference line is separated from the supporting line by an anterior distance and extends parallel to the supporting line. The reference geometries and/or the reference line serve as a reference for aligning the extramedullary alignment rod instead of the anterior edge of the tibia. The reference geometries are each adapted for at least mediolaterally form-fit mounting of the extramedullary alignment rod.