Collateral meridian therapy (CMT) is a recently developed technique according to traditional Chinese medicine (TCM) experiences, differing from traditional Chinese acupuncture in numerous manners. CMT involves the manipulation of a distant non-painful collateral meridian, thereby facilitating the dissipation of pain. The technique avoids direct stimulation of the involved meridian, which enhances patient tolerability and prevents further injury to the disease and painful areas. Numerous clinical cases have reported the effectiveness of CMT in pain management. This study tests whether CMT is effective for treating knee OA pain and functional recovery.