Fig. 6From: Bone marrow mesenchymal stem cell-derived exosomes protect cartilage damage and relieve knee osteoarthritis pain in a rat model of osteoarthritisSchematic diagram of knee joint pain caused by intraarticular injection of sodium iodoacetate to establish the rat model of knee joint OA (a). Neuronal damage and excitability increase in L3–5 DRG are important causes of pain and peripheral sensitization, which participate in the pathogenesis of OA pain (b)Back to article page