The general purpose of this study is characterization of tissue-resident cells derived from different musculoskeletal and/or associated connective tissues (such as cartilage, synovial membrane, synovial fluid, bone, adipose tissue and tendons), in order to identify new strategies for the treatment of degenerative and inflammatory musculoskeletal disorders. Cells isolated from different tissue sources will be compared with each other by phenotypic and functional characterization, following culture and treatment with inflammatory elements, drugs and orthobiologics. Moreover, with the aim to assess predictive markers of therapeutic success, a correlation study of the content and properties of the cells isolated from different types of tissue with the clinical profile of the enrolled patients will be conducted.