Fig. 9

Aggregated somatosensory parameters (somatosensory principal components) in the CRPS-affected knee before (“Pre”) and after L4-DRG stimulation (“Post”) normalized to QST from the contralateral control knee. Sensitivity normalized for all pain components, but not for thermal and mechanical detection. Pressure pain/pain summation (PPT/WUR), thermal pain (CPT/HPT), punctate mechanical pain (MPT/MPS), thermal detection (CDT/WDT/TSL) and mechanical detection (MDT/VDT). Open circles—Non-nociceptive components “(detection”); Black circles—Nociceptive components (“pain”). *p < 0.05 pre vs. post L4-DRG stimulation.