Porous matrix based on a polymer or a mixture of biologically compatible polymers, characterized in that the matrix has pores with a size of 130 μm or less and pores with a size of 370 μm or greater, the degree of porosity amounts to 93 98% and the matrix can be obtained by compacting a mixture of polymer particles with a grain size in the range of 20 to 950 μm and sodium chloride particles with a grain size in the range of 90 to 670 μm and subsequent elimination of sodium chloride, the degree of porosity being the numerical indication in% with respect to the proportion of the pore volume in the total volume of the matrix and the matrix presenting the following pore size distribution: 0.5% at 6% of pores with an average diameter in the range of 70 to 100 μm； from 2% to 8% of pores with an average diameter in the range of 101 to 115 μm； from 2% to 8% of pores with an average diameter in the range of 116 to 130 μm； from 1% to 7% of pores with an average diameter in the range of 131 to 300 μm； from 11% to 23% of pores with an average diameter in the range of 301 to 330 μm； from 4% to 10% of pores with an average diameter in the range of 331 to 360 μm； from 5% to 17% of pores with an average diameter in the range of 361 to 390 μm； from 7% to 19% of pores with an average diameter in the range of 391 to 420 μm； from 3% to 9% of pores with an average diameter in the range of 421 to 450 μm, from 12% to 24% of pores with an average diameter in the range of 451 to 480 μm； and from 5% to 17% of pores with an average diameter in the range of 481 to 510 μm, the pore sizes and the pore size distribution being determined by scanning electron microscopy.Matriz porosa a base de un polímero o de una mezcla de polímeros biológicamente compatibles, caracterizada por que la matriz presenta poros con un tamaño de 130 μm o inferior y poros con un tamaño de 370 μm o superior, el grado de porosidad asciende a del 93 al 98 % y la matriz puede obtenerse mediante compactación de una mezcla de
