Aseptic loosening and stress shielding are the most common causes of implant failure after total knee and hip arthroplasty. Failure is due to difference in mechanical properties of natural bone and artificial implants. Porous structures provide the solution to this problem and are being used in implants to avoid failure. The purpose of this research is to determine an optimum porous structure that gives similar mechanical properties as natural bone and can be used in implants. Four different structures have been analyzed for their mechanical properties at different pore sizes and orientation. Finite element analysis is performed in all designs using the ANSYS structural module mimicking ISO standard testing (ISO 13314). All of the structures give optimum porosity to be used as implants, but only some instances show similar Young�s modulus and yield strength to mimic bone�s mechanical properties. The analysis of the porous structures gives promising results for application in orthopedic implants. Application of optimum structure to implants can reduce the premature failure of implants and increase the reliability. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2020.