A review. According to the national survey of basic citizen life conducted by MHLW in 2006, people necessitating nursery as a result of fracture and joint disorders (e.g. Osteoarthritis) are 10.5 and 8.9% resp. This percentage doubled for people necessitating support after having joint disorders. Probably, prevention is the most important countermeasure for this. However, solutions such as total joint replacements (TJR) and Trauma implants (TI) are contributing to regain quality of life. Characteristics required for these biomaterials are sufficient material strength and biocompatibility for both TJR and TI, and wear resistance for articulating surface of TJR. Today, the main biomaterials used for these implants are stainless steel, Vitallium (Co-Cr alloy) and Titanium alloy. Great progress in wear reduction of articulating surface was observed in the last decade as the advancement of technologies in material progressed.