Effects of A. chica extract on mechanical hyperalgesia in rats with induced osteoarthritis (OA). The induction of OA was done by the injection of MIA (2 mg) in the knee of Wistar rats. After 3 days, the animals received oral saline (CTL−), Meloxicam (CTL + Melox) and extract of A. chica at doses 50, 150, and 450 mg/kg (EHA50, EHA150, and EHA450). After 7, 14, 21, and 28 days of OA induction, the nociceptive threshold of withdrawal of the affected paw was measured by indirect evaluation with Randall Sellito apparatus. The data are represented in mean ± standard deviation of the means. The healthy group is represented by animals without osteoarthritis and without treatment (CLEAN). ** represents significant differences, with p < 0.005; **** with p < 0.0001 comparing the treatments to the saline group. # represents significant differences, with p < 0.05 comparing the EHA450 with CTL + Melox.