Long-term experience with implanted intrathecal drug administration systems for failed back syndrome and chronic mechanical low back pain.

For the LBP group, there was a significant reduction in pain score with treatment from a median of 9 to 6 (Wilcoxan, Z = 2.87, p = 0.0041); however, although quality of life measurement changes were similar to the failed back syndrome cohort and showed a trend to improvement this was not statistically significant (Wilcoxan, p > 0.005).

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There was a trend towards improvement in the majority of quality of life measures in the mechanical back pain group but this did not reach statistical significance due to the smaller numbers in this cohort (p > 0.005, Wilcoxan signed ranks test with Bonferroni correction).

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