Artificial knee joint and surgical instrument used in artificial knee joint replacement surgery

摘要

A surgical instrument including a pre-cut trial mounted on a pre-cut line which is cut shallower than a genuine-cut line. The pre-cut trial is modeled after the genuine implant which is mounted on resected surfaces formed by performing genuine-cutting and comprised of an end resected surface, posterior and anterior resected surfaces, and posterior and anterior chamfer-resected surfaces on the distal end of a femur, and the pre-cut trial is mounted on the pre-cut line, thus observing the extended and flexed positions of the femur and the state of flexion thereof so as to make judgment if the genuine implant is appropriate.

主权项

1. A surgical instrument comprising:
a pre-cut trial configured to be mounted during an artificial knee joint replacement operation on a resected surface of a pre-cut line cut shallower than a genuine cut line by a pre-cut trial pin configured to be inserted in the resected surface, so that extension and flexion of femur and tibia can be observed and that it can be judged whether or not a genuine implant is appropriate, a pre-cut guide configured to be mounted on the end resected surface defined by the genuine-cut line or the pre-cut line; a femoral sizer configured to be seated in and fitted to anterior and posterior condyles of the femur; a pre-cut guide guide-pin configured to be inserted in the end resected surface through an insertion hole formed in the femoral sizer; and a resection instrument configured to be inserted from the insertion hole, wherein the resected surface comprises an end resected surface, which is perpendicular to a bone axis, posterior and anterior resected surfaces, which are parallel to the bone axis, a posterior chamfer-resected surface connecting the end resected surface and the posterior resected surface, and an anterior chamfer-resected surface connecting the end resected surface and the anterior resected surface; said pre-cut trial is configured to be mounted on part or all of said genuine-cut line or part or all of said pre-cut line; and at least the posterior chamfer-resected surface and posterior resected surface are formed by performing genuine-cut or pre-cut by inserting the resection instrument into the insertion hole.