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Concentrations of receptor activator of nuclear factor-kappa-B ligand (RANKL), osteoprotegerin (OPG), and prostaglandin E2 (PGE2) in synovial fluids (SFs) from patients with a loose prosthesis or with osteoarthritis (OA). RANKL (a) and OPG (b) in SFs were analysed with commercially available enzyme-linked immunosorbent assays. (c) PGE2 in SFs was analysed with a commercially available radio-immunoassay.
