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An acetabular cup is a part of artificial hip joint, and the conventional cups made of metal have some problems.One of them, for example, is the difference of stiffness between bone and metal, and the difference induces stress shielding of bone.To solve these problems, a cup made of carbon fiber reinforced plastics (CFRP) is one of the effective artificial hip joint.Because CFRP is able to design its stiffness as intended to provide tailor-made implant.