Myrtol improves the levels of (A) MDA and (B) SOD in PTKO model, as observed by ELISA. **P<0.01 vs. control model group; ##P<0.01 vs. PTKO group. PTKO, post-traumatic knee osteoarthritis; LDM, low dose myrtol; MDM, medium dose myrtol; HDM, high dose myrtol; MDA, malondialdehyde; SOD, superoxide dismutase.