Abstract: Background: Polymer composites for use in prosthetics contain several components, but the main ingredients are the organic component-matrix and the inorganic component-reinforcement. The physical-mechanical properties of the composite depend on the reinforcement content, the bond between the matrix and the reinforcement as well as on the reinforcement distribution. Hybrid composite materials are a combination of either two types of matrix with one reinforcement or two types of reinforcement in one matrix, and other combinations are possible. In that way, it is possible to design and modify - cut the physical-mechanical and functional properties of composites, and process materials with predefined properties.