A pin assembly for operation includes a hollow pin for operation having a plurality of side holes defined through an outer surface thereof and a head which is closed or open due to the presence of a through-hole a hollow support having a pin fastening part formed therein in the shape of a groove to fasten one end of the pin for operation, and being open at both ends thereof, and a hollow injector for insertion into an insertion hole formed in the support, wherein the hollow pin for operation is fastened to the pin fastening part of the support, and by applying external force to one end of the support, the hollow pin for operation is inserted into a bone.
