Articular cavity injection is a common administration method for the clinical treatment of osteoarthritis, but there are limitations such as easy loss of drugs and short duration of efficacy. In order to improve the clinical curative effect, new drug delivery systems have attracted the attention of researchers. Based on the clinical treatment of osteoarthritis by injecting drugs into the joint cavity, this paper summed up the research progress of various new drug delivery systems, such as hydrogel, liposomes, microspheres, nanoparticles, viral ...