Effects of dorsal root ganglion stimulation/spinal cord stimulation on rats with monosodium iodoacetate-induced osteoarthritis pain, showing responses ipsilateral and contralateral to the monosodium iodoacetate injection for the threshold for withdrawal from knee compression using a pressure application measurement device (A). Also shown are the scored response to knee bending (B), and group comparisons for area under curve. Results are mean ± SD. *P < 0.05, **P < 0.01, ***P < 0.001 by the Tukey test after one-way ANOVA; 2, P < 0.01 by the paired t test; n, number of animals.