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The procedures for the bone marrow stimulation technique and the injectable implantation system using ultrapurified alginate gel (UPAL gel). A cylindrical defect is created on the patellar groove (A), seven holes of subchondral penetration are made in the defect (B), followed by gelation of the superficial layer of the implanted alginate by applying CaCl2 (C). Color images available online at www.liebertpub.com/tec
