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BackgroundDue to varying degrees of difficulty in obtaining different mesenchymal stem cells (MSCs), the distinct pain levels and treatment costs, and for providing concrete evidence for future clinical practice, a thorough comparison of all relevant MSCs remained critical. Hence, this study aimed to achieve this objective to compare the efficacy of MSCs obtained from different sources in clinical outcomes and cartilage repair of knee osteoarthritis (KOA).MethodsThe EmBase, PubMed and Cochrane Library databases were searched for eligible studies. Randomized controlled trials (RCTs) that compared MSCs from different sources with placebo or each other in KOA patients. Conventional meta-analysis and frequentist network meta-analysis (NMA) were conducted. The primary clinical outcome was pain relief. The frequentist NMA was conducted using Stata with the "network" command.ResultsEight studies (seven trials) involving 203 KOA patients were included in this meta-analysis. The MSCs were considered superior over placebo for pain relief and improved function in KOA, but showed no statistically significant differences for cartilage regeneration. Among all the MSCs, the adipose tissue-derived MSCs (AD-MSCs) most effectively relieved pain.ConclusionThese findings suggested that MSCs are effective in the treating of KOA. AD-MSCs might be the most effective for relieving pain, and Umbilical cord-derived mesenchymal stem cells (UC-MSCs) might be the most effective for improving function. However, the current evidence does not support the use of MSCs for improving cartilage repair in KOA patients.

annals of translational medicine

Which is the most effective one in knee osteoarthritis treatment from mesenchymal stem cells obtained from different sources? —A systematic review with conventional and network meta-analyses of randomized controlled trials