How many "series" of epidural injections before additional/alternative treatment is needed?

Unknown. 30y female ?'s number epidural injections (cortisone + -Caine drug) tried before "alternative/additional" therapies. These injections are only palliative, & not curative; sometimes providing no substantial pain amelioration, & if they do the relief is only temporary. Osteopathic evaluation might lead to alternative treatments not based on incomplete clinical insight provided by MRI's. See comments.