Objective To observe the effect of advanced oxidation protein products (AOPPs) on articular and synovial in a rabbit model of osteoarthritis (OA).Methods 48 male New Zealand rabbits were randomly divided into 3 groups:AOPPs group,PBS group and sham-operated group.OA model were created in AOPPs group and PBS group by anterior cruciate ligament transection and medial meniscus resection (ACLT+MMx).then intra-articular injection of 1 ml AOPPs or PBS were performed once every other day in AOPPs group and PBS group,respectively.In sham-operated group,the anterior cruciate ligament was just exposed without transection,and then the incision was sutured.All rabbits were saerificed after 4 and 8 weeks of intervention,respectively.Results The India ink seore of 4 and 8 weeks were 4.19±0.60,5.75±0.60 in AOPPs group,and 1.06±0.18,1.38±0.60 in sham-operated group,2.50±0.46、3.06±0.62 in PBS group,respectively.In addition,the differences were statistically significant among the three groups.The Mankin score of 4 and 8 weeks were 8.19±0.70,11.94±0.90 in AOPPs group,and 0.75±0.53,1.06± 0.73 in sham-operated group,4.25± 1.46、4.50±0.89 in PBS group,respectively.The differences were statistically significant among the three groups.Meanwhile,the protein expression level of matrix metalloproteinases (MMP)-3 on synovial at 4 and 8 weeks in AOPPs group were 1.006±0.080,1.098±0.088;0.065±0.006,0.053±0.011 in sham-operated group;and 0.552±0.024,0.839±0.084 in PBS group,respectively.The proteiu expression level of MMP-13 on synovial at 4 and 8 weeks in AOPPs group were 0.966±0.080,1.621 ±0.041;0.101±0.022,0.367±0.033 in sham-operated group;and 0.564±0.030,1.322±0.085 in PBS group,respectively.The differences were statistically significant among the three groups at two times.Conclusion AOPPs participate in the occurrence and development of artieular cartilage by upregulating the protein expression of MMP-3 and MMP-13 on synovial.