Fig. 2

a Skin temperature in the affected and controlateral control knee. b Levels of depression on the Beck Depression Inventory (BDI) before and after L4-DRG stimulation. c Ongoing pain in the knee affected by CRPS before and after L4-DRG stimulation. ***p <  < 0.0001 CRPS-affected vs. contralateral control knee, ^#p < 0.05, ^##p < 0.01 pre vs. post L4-DRG stimulation