Ünlü R, Usta HE. Intra-Articular Platelet-Rich Plasma, Hyaluronic Acid, and Mesenchymal Stem Cell for Knee Osteoarthritis (2000-2025): A Multi-Database Bibliometric Analysis. Eur Res J. 2026;12(7):789-797. doi:10.18621/eurj.1840243