Implants with roughened surfaces

摘要

Provided are methods for processing a green body that includes compacted metal powder, comprising impacting the green body with a particulate material for a time and under conditions effective to displace a portion of the metal powder from the green body. The present methods can be used to prepare green bodies that have “roughened” surfaces and that can be used to make orthopedic implants displaying low movement relative to bone when installed in situ, which corresponds to higher stability upon implantation and decreases the time required for biological fixation of the implant. Also provided are implants comprising a metallic matrix, and methods comprising surgically installing an implant prepared from a “surface roughened” green body in accordance with the present invention.

主权项

1. A method for processing a green body comprising
mixing at least one metal powder with extractable particles of salt or sugar, thereby forming a powder mixture in which said metal powder and extractable particles assume respective positions; shaping said power mixture into a shaped object; compacting said shaped object to form said green body; exposing said green body to a solvent in which said extractable particles are soluble to remove at least a portion of said extractable particles thereby forming a green body having a porosity of about 50 to 90%; and impacting said green body that has been exposed to said solvent with a particulate material for a time and under conditions effective to displace a portion of said metal powder from said green body; sintering said green body having a portion of said metal powder displaced therefrom to form an implant having a roughness that corresponds to a Pa value of at least 50, a roughness that corresponds to a Pp value of at least 90, a roughness that corresponds to a Pt value of at least 200, or a roughness that corresponds to a Pq value of at least 60.