Intra-Articular Injection of Secretome, Derived from Umbilical Cord Mesenchymal Stem Cell, Enhances the Regeneration Process of Cartilage in Early-Stage Osteo-Arthritis: An Animal Study

19 male sheep, which were operated on with total lateral meniscectomy to induce knee osteoarthritis, were divided into three groups: the secretome group, hyaluronic acid group, and MSC group.