Why do I need to pre-drill when there is a trocar point on the anchor?
Pre-drilling, whether it is a bone screw, external fixation pin, or bone anchor is always a good idea. The trocar will drill into bone, but it primarily acts to tap the screw threads. The harder the bone the more important it is to pre-drill. If you choose to not pre-drill in softer bone you can. Use the instructions for “Application in dense cortical bone,” as starting at the hole may prematurely cleave the insertion shaft.
