1. Trap bar deadlifts are not actually deadlifts. The defining characteristic of a deadlift is that the load is in front of your center of balance. Trap bar deadlifts are actually squats, because the load is centered on your center of balance. It's a fine exercise, I'm just trying to point out that it's far different from a standard deadlift than the naive impression many people form based on their appearance. I think many people try to swap in a trap bar because the starting position doesn't require as much hamstring mobility, but they are not interchangeable. 2. You can absolutely injure yourself doing trap bar deadlifts or any other type of squat with poor technique.