THE PRESENT INVENTION REGARDS A BIOLOGICAL MATERIAL COMPRISING: A) A LIQUID CARRIER COMPRISING A VISCOUS SOLUTION CONTAINING AT LEAST ONE NATURAL AND/OR SEMISYNTHETIC POLYSACCHARIDE, AND HAVING A DYNAMIC VISCOSITY MEASURED AT 20°C AND AT SHEAR RATE OF D=350 S¯¹, COMPRISED BETWEEN 100 AND 250 C POISE AND/OR A KINEMATIC VISCOSITY COMPRISED BETWEEN 99 AND 248CST (MEASURED AT THE SAME CONDITIONS)； B) A CULTURE OF MESENCHYMAL STEM CELLS, AND/OR C) A PLATELET-RICH HEMO-DERIVATIVE. THIS TYPE OF MATERIAL IN FORM OF VISCOUS LIQUID IS PARTICULARLY SUITABLE FOR THE THERAPY OF OSTEOARTHROSIS, LIGAMENT DAMAGE, IN PARTICULAR TENDON AND CARTILAGE DAMAGE) AND MAY BE ADMINISTERED INTRA-ARTICULARLY, INTRADERMALLY OR DIRECTLY APPLIED IN SITU WITHOUT ALTERING THE PROPERTIES OF THE MESENCHYMAL STEM CELLS AND/OR PLATELETS CONTAINED THEREIN.
