Dr. Jose Miguel Catalán is an experienced orthopedic surgeon specializing in regenerative medicine and sports trauma. Following the orthobiologic pioneer Mikel Sánchez, M.D., Dr. Catalán has developed a unique treatment protocol which includes subchondral and intraarticular PRP injections for moderate-severe knee osteoarthritis. This Circle helps Dr. Catalán capture the long-term outcomes of his patients, as well as correlate specific clinical variables, such as patient demographic information, disease severity, platelet dose and other PRP factors. Interested practitioners around the world are invited to join his Circle, access his real-world long-term outcomes, and contribute their own real-world cases to advance patient care and outcomes for this common clinical indication.