I have full body and internal RSD and have had 5 surgeries even with it you just need dctors who know you, RSD and how to keep your pain under control without spreading. For my foot surgeries they did a epidural that ran from the day of surgery and then for 5 more days in hospital they also kept me on continuos ketamine infusions along with my normal meds. the pain meds I normally would take were switched to IV so its more powerful and all this helped and it didnt make my RSD any worse, or put me in flares. If you really need the suregery I would really talk to the doctor about a epidural, it will numb you from the waist down, rather than a nerve block that will wear off.