Method and apparatus for fixation of surgical instruments

A fixation pin, surgical assembly and method of fixing a cutting guide to a bone. The fixation pin includes a body having an interference portion which engages the wall of a hole in bone, a tip and a tool mating section. The surgical assembly includes an instrument for engaging the selected bone and a fixation pin operably interconnected with the instrument to engage the selected bone. Methods of fixing an instrument with a fixation pin are included. An incision is made to expose a bone. The instrument and fixation pin are interconnected and the assembly is mounted relative to a surgical site. The fixation pin is positioned in a rotationally fixed manner at a select position relative to the instrument to hold the instrument against the bone.