It's a start, but it seems marginally powered: "A sample size of participants (48 treatment participants, 24 control participants) was estimated by power analysis to achieve greater than 80% power to detect a 9-point change in FRI score with estimated standard deviations of plus or minus 15 in a 2-way repeated measures analysis of variance model with 5 time points."
What's the data for NRS as an outcome for any discogenic pain treatments? What do you do with a treatment that improves function but not pain?