Some words of advice for this to continue to provide relief long term.
1) push your doc and rep to program often during the first year. 3-6 times. Lot of things are happening the first year following implant with scar tissue and can affect the stim patterns/effectiveness.
2) commit to learning the system and how to modulate with various programs, pulses, frequencies etc. active pts who proactively learn and use the device get more and lasting relief.
3) continue to reprogram the device even after first year, just not as often.
4) If start to feel like it is ineffective, turn it off for a few days to reset your baseline. Pain is relative.

Good luck!