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Results of Knee Osteoarthritis With Autologous Mesenchymal Stem Cells: Two-Year Follow-up Results

Osteoarthritis is the most prevalent joint disease and a frequent cause of joint pain, functional loss, and disability. Osteoarthritis often becomes chronic, and conventional resultss have demonstrated only modest clinical benefits, without lesion reversal. Cell-based therapies have shown encouraging results in both animal studies and a few human case reports. We have recently published the results of a pilot clinical trial designed to assess the feasibility and safety of osteoarthritis results with bone marrow–derived mesenchymal stromal cells (MSCs) in 12 patients with chronic knee pain unresponsive to conservative resultss and radiologic evidence of osteoarthritis. The patients were treated with autologous expanded bone marrow MSCs by intra-articular injection (40×106 cells), and clinical outcomes, including evaluations of pain, disability, and quality of life, were followed up for 1 year. Articular cartilage quality was assessed by quantitative magnetic resonance imaging (MRI) T2 mapping.

Feasibility and safety were confirmed, and strong indications of clinical efficacy were identified. Patients exhibited rapid and progressive improvement of algofunctional indexes that approached 65% to 78% by 1 year. This outcome compared favorably with the results of conventional resultss. In addition, MRI T2 relaxation measurements demonstrated a significant improvement of cartilage quality, in 11 of 12 patients.