5 mm and 15 mm the correct plate is selected such that projection 6 interposes into the osteotomy in accordance with the degree of axial correction desired by the surgeon the height b of the projection is preferably 4 mm once the plate is synthesized at the site the projection prevents the osteotomy from losing the obtained correction the bone plate has a proximal surface 8 which preferably is curved as shown in fig1 to conform generally with the surface of the tibia each of the two holes 4 has a tapered counterbore 10 for receiving the head of a bone screw preferably a cancellous screw is used in the proximal hole and a cortical screw is used in the distal hole bone plate 2 has a width c that is sized to be accommodated by an insertion tool described below referring now to fig3 and 4 the system further includes a forked wedge shaped insertion tool 12 tool 12 includes a head 14 and a handle 16 preferably made of stainless steel or other surgically acceptable material tool head 14 includes two prongs 18 having smooth linearly tapered faces prongs 18 define an opening having a width d which.