Phenotypes in Osteoarthritis: Why Do We Need Them and Where Are We At?

This article is part of the Osteoarthritis issue for the Clinics in Geriatric Medicine journal. It covers the main aspects related to research and clinical practice of osteoarthritis phenotyping, including the concepts, the rationale for studies of OA phenotypes and their history, the approaches to OA phenotyping, recent advances in this area, and future directions.