Matrix-Applied Characterized Autologous Cultured Chondrocytes Versus Microfracture: Two-Year Follow-up of a Prospective Randomized Trial. by Saris, D, Price, A, Widuchowski, W, Bertrand-Marchand, M, Caron, J, Drogset, J, Emans, P, Podskubka, A, Tsuchida, A, Kili, S, Levine, D, Brittberg, M