Artificial joint stem
In the present disclosure, an artificial joint stem includes a base having an outer surface including a rough surface, and a coating film disposed on the rough surface of the base and containing a calcium phosphate-based material and an antimicrobial agent. The rough surface includes an exposed region exposed from the coating film.
1 . An artificial joint stem comprising:
a base having an outer surface comprising a rough surface; and
a coating film disposed on the rough surface of the base, the coating film containing a calcium phosphate-based material and an antimicrobial material,
wherein
the rough surface comprises an exposed region exposed from the coating film; and
an edge of the coating film is along an edge of the rough surface.
2 . The artificial joint stem according to claim 1 , wherein
a surface roughness of the exposed region of the rough surface is greater than a surface roughness of the coating film.
3 . The artificial joint stem according to claim 1 , wherein
of a whole of the rough surface, the exposed region is smaller than a region where the coating film of the rough surface is disposed.
4 . The artificial joint stem according to claim 1 , wherein
the base comprises a lower end side and a proximal end side that is adjacent to a proximal side of a human body when the artificial joint stem is in use, and
the exposed region exposed from the coating film is located only on the lower end side.
5 . The artificial joint stem according to claim 1 , wherein
the base comprises a layer member having a surface as the rough surface of the base.
6 . The artificial joint stem according to claim 5 , wherein
a thickness of the layer member is greater than a thickness of the coating film.
7 . The artificial joint stem according to claim 1 , further comprising:
at least one recessed portion disposed on a surface of the coating film.
8 . The artificial joint stem according to claim 7 , wherein
on the surface of the coating film, a region where the at least one recessed portion is disposed is smaller than a region where the at least one recessed portion is not disposed.
9 . The artificial joint stem according to claim 7 , wherein
the at least one recessed portion comprises at least one groove.
10 . The artificial joint stem according to claim 9 , wherein
the at least one groove comprises a first groove with one tip located on the exposed region.
11 . The artificial joint stem according to claim 9 , wherein
the at least one groove comprises a second groove with both ends located on the coating film.
12 . The artificial joint stem according to claim 9 , wherein
the at least one recessed portion comprises a plurality of recessed portions disposed discontinuously from each other.
13 . The artificial joint stem according to claim 7 , wherein
the at least one recessed portion comprises a bottom portion with a polygonal planar shape.
14 . The artificial joint stem according to claim 7 , wherein
the at least one recessed portion increases in depth along one direction of a straight line connecting two different points of edges of the at least one recessed portion.
15 . An artificial joint stem comprising:
a base having an outer surface comprising a rough surface with an edge; and
a coating film disposed on the rough surface of the base, the coating film containing a calcium phosphate-based material and an antimicrobial material,
wherein
the rough surface comprises an exposed region exposed from the coating film; and
an edge of the coating film is non-parallel to the edge of the rough surface.
16 . An artificial joint stem comprising:
a base having an outer surface comprising a rough surface; and
a coating film disposed on the rough surface of the base, the coating film containing a calcium phosphate-based material and an antimicrobial material,
wherein
the rough surface comprises an exposed region exposed from the coating film;
the outer surface comprises a surface different from the rough surface; and
the coating film comprises a coating film region straddling the rough surface and the surface different from the rough surface.
17 . The artificial joint stem according to claim 16 , wherein
the base comprises a lower end side and a proximal end side that is adjacent to a proximal side of a human body when the artificial joint stem is in use, and
the coating film region is located on the lower end side of the base.
18 . The artificial joint stem according to claim 16 , wherein
on the surface different from the rough surface, a surface roughness of the outer surface where the coating film region is located is greater than a surface roughness of a region exposed from the coating film region.