Previously, it was considered that knee anatomy is almost the same in all ethnic groups. based on this concept, the prostheses designed based on Caucasian people were used widely in all ethic groups. The first ethnicity in which this difference was proved, was Japanese. We have gathered the imaging data from all around the world and proved this difference between different ethnic groups. Based on these findings, we are trying to design the "Ethnic Specific Knee Prosthesis" for different ethnicities.