Myrtol improves the level of Bax protein in PTKO model, as observed in the (A) western blots and (B) the quantified Bax protein expression. **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.