The possibilities of using various kinds of aluminum oxide materials, modifying additives, and temporary technological binders for making bioinert ceramics based on aluminum oxide are considered. Regimes for heat treatment of intermediate pieces are developed. A ceramic material with a mean density of 4.01 g/cm3, three-point bending strength 380 ±20 MPa, a size of corundum crystal equal to 4 – 6 μm, and zero open porosity is obtained, which can be used in endoprostheses caps for coxofemoral joints.