Objective To assess the electroporation(EP) as non-viral gene vectors for gene therapy of osteoarthritis(OA). Methods Healthy male SD rats aged 8 weeks were selected. OA model was induced by medial meniscus forefoot resection and anterior cruciate ligament transection in the right knee. EP with interleukin-1 receptor antagonist(IL-1Ra) was locally performed in the joints of rats at 1 week after induction of OA. According to the treatments, rats were randomly divided into four groups: non-treated arthritis a...