Abstract
The bonding between a metal surface of a human joint prosthesis and a bone is not perfect. It makes the loosening of a metal component from a bone. Porous coating method is widely used to have a rough metal surface, but it cannot regulate the shape of a metal surface. It cannot make enough bonding. Our method is a new metal processing method using a laser scanning for a joint prosthesis, which was developed in Osaka Univ. Graduate School. The metal surface with a microscopic canal structure, which was processed by a new method, has a few times bonding strength compared to a porous coated surface. A new bone invasion was observed in all cavities of the canals. The results encourage the development of a new joint prosthesis which has no loosening from a bone.
