https://www.cochrane.org/fr/CD013342/CENTRALED_quels-sont-les-benefices-et-les-risques-des-injections-de-cellules-souches-pour-larthrose-du-genou 2025 United Kingdom review of literature french abstract degenerative joint disease of lower leg risk assessment injection of knee, nos risks and benefits stem cell osteoarthritis osteoarthritis, knee knee injections stem cells