Abstract
Knee osteoarthritis (OA) is a complex, progressive disorder that involves the gradual breakdown of articular cartilage, alteration of the subchondral bone, synovial inflammation, and joint space limitation, ultimately leading to stiffness, pain, and impaired balance and mobility. At this moment there is no cure to stop the evolution of the disease, only symptomatic treatment. This fact is due to the lack of understanding of the underlying mechanisms, thus limiting the possibilities of developing disease-modifying drugs. This challenge arises from an incomplete understanding of the underlying mechanisms of disease, which limits the development of effective disease-modifying drugs due to the fact that human tissue samples are typically obtained in the advanced stages of the disease, usually when the patient is subjected to joint replacement surgery, making the study of early OA stages more difficult. For researchers, the murine animal model provides a useful tool for assessing the full evolution of the pathology and the study of the efficacy and safety of novel experimental drugs and supplements. The aim of our review is to present the diverse currently used murine models ranging from spontaneous to chemically and surgically induced OA and pharmacological results that were obtained on such models and are available for human use or represent a potential innovative therapy in the near future.