Acupuncture Treatment for Knee Osteoarthritis With Sensitive Acupoints and Tender Points

Inclusion Criteria: * Participants aged 40 years or older and diagnosed with mild or moderate knee osteoarthritis(KOA) are eligible to participate in the study * The following criteria are used for diagnosis of KOA: * refractory knee pain for most days in the last month; * joint space narrowing, sclerosis or cystic change in subchondral bone (as demonstrated in X-ray); * laboratory examinations of arthritis: clear and viscous synovial fluid (≥2 times) and white blood cell count \< 2000/mm3; * morning stiffness continues less than 30 minutes; * bone sound exists when joints was taking flexion and/or extension. If a patient meets criteria 1 and 2, or criteria 1, 3, 4, and 5, a diagnosis of KOA is confirmed. Exclusion Criteria: Patients will be excluded if they meet any of the following: * diagnosed with conditions leading to skeletal disorders, such as tuberculosis, tumors or rheumatism of the knee joint and rheumatoid arthritis; * present sprain or trauma in the lower limb; * unable to walk properly due to foot deformity or pain; * present with mental disorders; * present with comorbidities including severe cardiovascular disease, liver or kidney impairment, immunodeficiency, diabetes mellitus, blood disorder or skin disease; * females who are pregnant or lactating; * using physiotherapy treatments for osteoarthritis knee pain; * have used intra-articular injection of glucocorticoid or viscosupplementation in the past six months; * received knee-replacement surgery; * diagnosed with severe (stage 4, according to Kellgren and Lawrence radiographic classification) or late clinical stage of KOA; * have a swollen knee or positive result of floating patella test; or' * are participating or have participated in the other clinical trials.