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For 15 or so years, I have dealt with localized and referred back and leg pain, respectively, from ruptured disc at L4-L5. I have had several series of ESIs. Within a day of the second injection, several years ago, I had extremely sharp pain and then permanent numbness in leg and most of foot as affected by the nerve root from L4-L5. An orotho friend described this as an acute event and possibly the result of more disc material affecting the nerve root. The pain has progressed a bit and a recent MRI confirmed the bulge at L4-L5 is larger and the foraminal space almost non-existent. Is it common to have permanent nerve damage after an ESI? With the pain and, possibly, leg function increase and deteriorate respectively?