In another example, if the veteran's range of motion in a knee is from 30 degrees to 90 degrees, then the veteran would be awarded a 40-percent rating for limitation of extension to 30 degrees under DC 5261. A rating under DC 5260 would not be in order because the leg can flex beyond an angle of 60 degrees.n referring to the knee diagram in Plate II, section 4.71, if the veteran's range of motion in a knee is from 0 degrees, then the veteran would be awarded a 20-percent disability rating for limitation of flexion to 30 degrees under DC 5260.