Exclusion criteria:
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(1) KL grade 4;
(2) Other inflammatory and painful diseases of knee joint, such as rheumatoid arthritis, psoriatic arthritis, gout, tumor, joint trauma, suppurative arthritis, etc;
(3) Knee osteoarthritis caused by osteomyelitis, bone tumor and bone tuberculosis;
(4) Patients with pyogenic and nonspecific infectious knee osteoarthritis were found;
(5) The patients with advanced joint deformity or disability;
(6) Intra articular treatment including intra-articular injection of drugs, intra-articular irrigation and arthroscopic surgery were performed within 3 months before the trial;
(7) Patients with multiple lower extremity osteoarthritis of hip, knee and ankle had lower limb pain due to the onset of lumbar degenerative disease;
(8) Alt >=1.5 ULN, abnormal Cr contration;
(9) Pregnant or lactating women;
(10) People with allergic constitution or allergic to this drug;
(11) Patients with severe cardiovascular and cerebrovascular diseases, blood system, liver, gastrointestinal tract, kidney disease and diabetes mellitus;
(12) Mental patients;
(13) Those who have used hormone therapy within one month;
(14) Those who have used other drugs for the treatment of knee osteoarthritis within one week before the trial, such as non steroidal anti-inflammatory drugs, benzothiazides, glucosamine, chondroitin sulfate and related traditional Chinese medicine;
(15) Long term use of other drugs that affect the efficacy and safety of the trial drug and take comprehensive treatment;
(16) Patients who have participated in other clinical trials within three months;
(17) The researchers consider that it is not suitable to participate in this experiment.
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