Patent ID: 7727238

Claim:
A determination device for a size of a cutting block, comprising: a connection device, comprising a supporting part having a flat top surface on an upper portion thereof, a fixation part on a lower portion thereof, a side plate, a plurality of holes formed on the fixation part, and a plurality of pins to be inserted through the holes for placing the flat top surface of the supporting part on an upper line of a predetermined flexion gap, the connection device is adapted to be fixed to a tibia by driving at least two of the plurality of pins through corresponding holes into the tibia; a body including a slide groove formed on a central portion of a front surface thereof, a bent part formed on an upper portion for safely mounting a precut anterior cortex of a femur on the bent part, and a plurality of graduations provided on the body to determine the size of the cutting block; a slider slidably connected with the slide groove of the body and including an indicating line on an upper portion thereof; and a guide, adapted to be placed on a femur, including an end fixed to the slider and a flat bottom surface of the guide coming into surface contact with the flat top surface of the supporting part of the connection device so as to stop a sliding movement of the slider and to place the flat bottom surface of the guide on the upper line of the predetermined flexion gap wherein the slider is placed so that length directions of the slider and the femur are perpendicular or substantially perpendicular, wherein the guide is marked with right and left directions to be applicable to both right and left knee arthroplasties by being reversibly inserted to the slider.