From: Long-term experience with implanted intrathecal drug administration systems for failed back syndrome and chronic mechanical low back pain
LBP
FBS
Years After Implant
n = 12
n = 25
1
2.30 (0.75–4.00)
3.10 (0.50–3.75)
2
3.30 (0.75–6.00)
5.20 (0.75–10.00)
3
4.30 (0.75–7.50)
5.30 (0.75–10.00)
4
5.20 (0.75–16.00)
5
5.50 (0.75–16.00)
6
4.90 (0.75–16.00)