“…Material science teaches that final implant properties depend on numerous parameters: the most obvious are polymer characteristics (chemical composition, molecular weight, crystallinity [2,3]), and calcium phosphate characteristics (chemical and mineralogical composition, particle size distribution, aspect ratio, spatial distribution, particle/ polymer interaction, concentration…) [4][5][6][7][8][9]. Moreover, preparation conditions have a crucial effect on the final properties of the material [10]. The most popular bioresorbable composite bone substitutes are based on hydroxyapatite/poly-L-lactic acid mixtures (HA/PLLA), since the raw materials are already approved for human clinical use and their degradation products are easily metabolized.…”