My wife Sue had spine surgery in 2010. She has 2 rod's from the base of her spine too just below her neck. The med part of her spine had degenerated so much the doctor could not fuse in that area. She keeps braking the rods, going on the fourth time. They all brake at the lower part of her spine. My question is, do the manufactures of the titanium rods have any responsibility in why the rods keep braking.