We are having a similar debate about screws and rods for spinal fusions. Is it necessary to document the lot numbers off the individual screws that are in the implant sets? Our current practice is to try to decipher the lot numbers off each screw, rod, etc. and document it in the chart along with the sterilization load from SPD. I am not talking about implants that come in a peel packs, I am strictly asking about implants coming from a tray sterilized in our SPD.