OBJECTIVEPoly-L-lactide (PLLA) is the main material making for biodegradable osteosynthesis. But the commonly used processes make the PLLA' s initial mechan
INTRODUCITIONHydroxyapatite (Ca10 (PO4) 6 (OH)2, HA) is a material with biological activity, which has good biocompatibility and is the major mineral constituen