The present invention relates to a process for obtaining an implantable cartilage gel for hyaline cartilage tissue repair comprising particles of hydrogel of chitosan and cells capable of forming hyaline cartilage said process comprising a step of amplification of primary cells in a three dimensional structure comprising particles of physical hydrogel of chitosan or of chitosan derivative then a step of redifferentiation and of induction of extracellular matrix synthesis by said amplified cells within the same three dimensional structure wherein said cells are primary articular chondrocytes and/or primary mesenchymal stem cells differentiated into chondrocytes. The present invention also relates to the resulting cartilage gel and to the various uses thereof for cartilage repair following a traumatic impact or an osteoarticular disease such as osteoarthrosis. The invention also relates to a three dimensional matrix comprising particles of physical hydrogel of chitosan or of chitosan derivative optionally supplemented with an anionic molecule such as hyaluronic acid or a hyaluronic acid derivative or a hyaluronic acid complex.
