A device for evaluating motion of a knee and for forming a brace which includes a first plate having four holes therein, a femoral arm, a tibial arm formed with a rectangular portion from which extends to a semi-circular portion having a central opening and an arcuate opening which for a first 25-30 degrees is an arc of a circle, for a subsequent 105-110 degrees is a spiral and is an arc of a circle from 135-140 to 180 degrees, a second plate having five holes therein and a small circular plate having a linear scale centrally thereof, a graduated arcuate scale and another arcuate opening configured to overlap the arcuate opening of the semi-circular portion of the tibial arm.
