Patent ID: 11793648

Abstract:
Provided is an artificial joint that can improve fatigue strength while achieving the ability to fix to a bone. An artificial joint 1 includes a stem portion 2. The stem portion 2 has a distal end for insertion into a bone and a proximal end opposite the distal end and includes a roughened surface portion 4 which 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 portion 4 includes a distal end-side edge section 7 and a proximal end-side section 7, the distal end-side edge section 7 including a distal end-side edge portion of the roughened surface portion 4, the proximal end-side section 7 being configured as a section closer to the proximal end than the distal end-side edge section 7 is to the proximal end. The distal end-side edge section 7 has a surface roughness Ra1 lower than a surface roughness Ra2, Ra3 of the proximal end-side section.