The animals were divided into 3 groups, one group with 5, another with 10, and another with 30 rats corresponding, respectively, to the Control Group (CG); SHAM Group (SHAM), and Pterostilbene Group (PG). The SHAM and PG groups were divided into rats with joint injury without treatment and rats with injury and treatment by oral Pterostilbene solution; the groups were subdivided into 0 (with euthanasia 12 hours after arthritis induction) and 3 days (with euthanasia 72 hours after induction) (Table 1 Supplementary Material).