Acetabular surgical implant for segmental pelvic defect and methods of use and manufacture
A medical device, i.e., an acetabular surgical implant, for a segmental acetabular defect with pelvic discontinuity that is installable and fully functional without any need for any intermediary implant such as a surgical cage or a surgical shell. The surgical implant includes a hemispherical cup with a plurality of equidistant apertures extending through the cup, and a ribbed, elongated stress-diffusion element, i.e., a stem, extending from the cup. The stem is formed to extend from and be oriented with respect to the cup based on whether the surgical implant is to be used on a left side of the patient, i.e., a left acetabulum, or a right side of the patient, i.e., a right acetabulum, for reconstruction of the segmental acetabular defect.
1. A surgical implant comprising:
a hemispherical cup having (i) a bone-abutment exterior surface defining a convex side of the cup, (ii) an interior surface defining a concave side of the cup with a cavity, and (iii) a circumferential rim extending between the bone-abutment exterior surface and the interior surface;
at least one aperture defined by a circumferential surface extending between the bone-abutment exterior surface and the interior surface, the at least one aperture operable to receive a screw therethrough; and
a stress-diffusion element extending directly from the bone-abutment exterior surface of the cup at an anteverted orientation to the cup, wherein the cup and the stress-diffusion element are monolithic.
2. The surgical implant of claim 1 ,
wherein,
the rim extends along a plane and defines a circle with a first center point,
the bone-abutment exterior surface of the cup defines a second center point, and
a line between the first center point and the second center point extends perpendicular to the plane.
3. The surgical implant of claim 2 ,
wherein,
the stress-diffusion element is a stem extending from the cup.
4. The surgical implant of claim 3 ,
wherein,
the stem includes a base formed on the bone-abutment exterior surface of the cup and spaced from the second center point.
5. The surgical implant of claim 4 ,
wherein,
the base is centrally formed between the second center point and a closest portion of the rim.
6. The surgical implant of claim 4 ,
wherein,
the base is centrally formed between the at least one aperture and another aperture extending between the bone-abutment exterior surface and the interior surface.
7. The surgical implant of claim 3 ,
wherein,
the stem includes a plurality of longitudinal flutes, each of the plurality of longitudinal flutes extending along an entirety of the stem with (i) distal ends of the plurality of longitudinal flutes adjoining at a common point, and (ii) proximal ends of the plurality of longitudinal flutes tapering at separate points.
8. The surgical implant of claim 7 ,
wherein,
adjacent ones of the plurality of longitudinal flutes are spaced from each other by one of a plurality of troughs, and
each of the plurality of troughs includes sidewalls and a bottom wall.
9. The surgical implant of claim 8 ,
wherein,
each of the plurality of troughs includes an increasing depth along the stem.
10. The surgical implant of claim 8 ,
wherein,
each of the plurality of longitudinal flutes includes a plateau along a portion thereof with an increasing width along the stem.
11. The surgical implant of claim 8 ,
wherein,
each of the plurality of longitudinal flutes surrounds a portion of the adjacent ones of the plurality of troughs.
12. The surgical implant of claim 8 ,
wherein,
the sidewalls of each of the plurality of troughs converge.
13. The surgical implant of claim 8 ,
wherein,
the at least one aperture includes four apertures arranged equidistant relative to each other along the cup.
14. The surgical implant of claim 2 ,
wherein,
the stress-diffusion element extends from a point on the bone-abutment exterior surface, and
the point is spaced from the second center point.
15. The surgical implant of claim 14 ,
wherein,
the stress-diffusion element extends from the cup at forty-five degrees relative to the plane, and
the anteverted orientation of the stress-diffusion element relative to the cup is twenty degrees relative to the line.
16. The surgical implant of claim 2 ,
wherein,
the at least one aperture is a plurality of apertures,
the plurality of apertures are equidistant relative to each other along the cup,
the stress-diffusion element extends from a point on the bone-abutment exterior surface, and
the point is spaced from the second center point and between the plurality of apertures.
17. The surgical implant of claim 1 ,
wherein,
the stress-diffusion element includes a plurality of longitudinal flutes, and
each of the plurality of longitudinal flutes extending along a substantial portion of the stress-diffusion element.
18. A surgical implant comprising:
a hemispherical cup having (i) a bone-abutment exterior surface defining a convex side of the cup, (ii) an interior surface defining a concave side of the cup with a cavity, and (iii) a circumferential rim extending between the bone-abutment exterior surface and the interior surface, the rim extending along a plane and defining a circle with a first center point, the bone-abutment exterior surface of the cup defining a second center point, a line between the first center point and the second center point extending perpendicular to the plane;
at least one aperture defined by a circumferential surface extending between the bone-abutment exterior surface and the interior surface, the at least one aperture operable receive a screw therethrough; and
a stress-diffusion element extending (i) directly from the bone-abutment exterior surface of the cup, (ii) at an anteverted orientation to the cup, and (iii) from a third point on the cup, the third point spaced from the second center point, wherein the stress-diffusion element and the hemispherical cup are monolithic.
19. A surgical implant comprising:
a hemispherical cup having (i) a bone-abutment exterior surface defining a convex side of the cup, (ii) an interior surface defining a concave side of the cup and a cavity, and (iii) a circumferential rim extending between the bone-abutment exterior surface of the cup and the interior surface of the cup;
at least one aperture having a circumferential surface extending between the bone-abutment exterior surface of the cup and the interior surface of the cup; and
a stress-diffusion element extending directly from the bone-abutment exterior surface of the cup at an anteverted orientation to the cup, the stress-diffusion element and the cup being monolithic.