Kyocera Corporation

Keita Ishimizu

Takeshi Sumitani

Mitsuyoshi Yamashita

Provided is an artificial joint that can improve fatigue strength while achieving the ability to fix to a bone. An artificial jointincludes a stem portion. The stem portionhas a distal end for insertion into a bone and a proximal end opposite the distal end and includes a roughened surface portionwhich is provided in a proximal end-side portion, which has a rougher surface than a distal end-side portion, and which is larger in cross-sectional area than the distal end-side portion. The roughened surface portionincludes a distal end-side edge sectionand a proximal end-side section, the distal end-side edge sectionincluding a distal end-side edge portion of the roughened surface portion, the proximal end-side sectionbeing configured as a section closer to the proximal end than the distal end-side edge sectionis to the proximal end. The distal end-side edge sectionhas a surface roughness Ralower than a surface roughness Ra, Raof the proximal end-side section.

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Kyoto, Japan

Keita Ishimizu