Complex sentence: Facet joint injections and steroid injections into the discs have not been found to be effective in those with persistent, non-radiating pain; however, may be considered in those with persistent sciatic pain.
Split into simpler sentences: Facet joint injections and steroid injections into the discs have not been found to be effective in those with persistent, non-radiating pain. Such injections may be considered in those with persistent sciatic pain.