All opinions appreciated. What are your first line choices for new onset CRPS? Case in point...30 yo pt s/p arthroscopic knee surgery one month ago. Several day hx of severe allodynia of the distal lower extremity, neurologically intact. I was consulted to perform lumbar sympathetic block. Excellent but transient improvement (3 hrs). I'm thinking neurontin, elavil, maybe topical ketamine, aggressive rehab, etc. Would anyone perform serial sympathetic blocks? When would you perform a bone scan? Thanks!