Bone insert augment and offset method
A bone insert includes a cap having a convex top surface, an elongated stem, and a barrier between the cap and the stem. The stem of the bone insert is inserted into a hole formed in a host bone until the barrier is pressed against the exposed bone. The bone implant can be placed against a small focus contact point on the cap. Liquid cement can be injected into a space volume between the host bone and a bone implant. The cap can be made of a material and/or have surface features that create a strong bond with the cement when the liquid cement cures. The stem can be made of a material and/or have bone ingrowth surface features that create a strong bond with the bone.
1. A method for coupling a bone insert to a bone comprising:
providing the bone insert having a cap having interdigitation surfaces, an elongated stem having bone ongrowth surface features on an outer surface of the elongated stem that extends downward from a barrier structure, and the barrier structure coupled between a lower portion of the cap and an upper portion of the elongated stem;
inserting the stem of the bone insert into the bone;
placing the barrier structure against a surface of the bone;
placing a bone implant against the cap;
pouring liquid poly(methyl methacrylate) cement into at least one of a plurality of fenestrations in the cap;
transmitting the liquid poly(methyl methacrylate) cement onto the interdigitation surfaces on the cap;
blocking the liquid poly(methyl methacrylate) cement from flowing through the barrier structure to the elongated stem; and
curing the liquid poly(methyl methacrylate) cement to bond the bone implant to the cap.
2. The method of claim 1 further comprising:
drilling a hole in the bone surface before the stem is inserted into the hole in the bone surface.
3. The method of claim 1 further comprising:
drilling the bone with a stepped drill bit;
wherein the stem is inserted into a hole in the bone surface and the barrier is placed against a step in the hole formed by the stepped drill bit.
4. The method of claim 1 further comprising:
providing a polymer coating on a portion of an upper and outer surface of the cap;
placing the bone implant against the polymer coating on the cap at a focal point contact area that is less than 60 square millimeters;
placing poly(methyl methacrylate) cement on the focal point contact area.
5. The method of claim 1 further comprising:
providing a cured layer of liquid poly(methyl methacrylate) cement on the cap of the bone insert;
placing the bone implant against the cured layer of liquid poly(methyl methacrylate) cement on the cap at a focal point contact area that is less than 60 square millimeters.
6. The method of claim 1 further comprising:
providing bone ongrowth surfaces on a lower portion of the barrier structure; and
receiving bone material onto the bone ongrowth surfaces on the lower portion of the barrier structure.
7. The method of claim 1 further comprising:
forming helical threads on external surfaces of the stem of the bone insert;
rotating the bone insert relative to the bone to screw the bone insert into the bone.
8. A method for coupling a bone insert to a bone comprising:
providing the bone insert having a cap having interdigitation surfaces, a polymer coating on a portion of an upper and outer surface of the cap, an elongated stem having bone ongrowth surface features on an outer surface of the elongated stem that extends downward from a barrier structure, and the barrier structure coupled between a lower portion of the cap and an upper portion of the elongated stem;
inserting the stem of the bone insert into the bone;
placing the barrier structure against a surface of the bone;
placing a bone implant against the cap;
pouring liquid poly(methyl methacrylate) cement onto the interdigitation surfaces on the cap;
transmitting the liquid poly(methyl methacrylate) cement through a plurality of fenestrations in the cap to an outer surface of the cap;
blocking the liquid poly(methyl methacrylate) cement from flowing into the elongated stem of the bone insert by the barrier structure; and
curing the liquid poly(methyl methacrylate) cement to bond the bone implant to the cap.
9. The method of claim 8 further comprising:
drilling a hole in the bone surface before the stem is inserted into the hole in the bone surface.
10. The method of claim 8 further comprising:
drilling the bone with a stepped drill bit;
wherein the stem is inserted into a hole in the bone surface and the barrier is placed against a step in the hole formed by the stepped drill bit.
11. The method of claim 8 further comprising:
placing the bone implant against a focal point contact area of the cap that is less than 30 square millimeters.
12. The method of claim 8 further comprising:
providing the polymer coating on a portion of an upper and outer surface of the cap;
placing the bone implant against the polymer coating on the cap at a focal point contact area that is less than 30 square millimeters;
placing poly(methyl methacrylate) cement on the focal point contact area of the cap.
13. The method of claim 8 further comprising:
providing the cured layer of liquid poly(methyl methacrylate) cement on the cap of the bone insert;
placing a bone implant against the cured layer of liquid poly(methyl methacrylate) cement on the cap at a focal point contact area that is less than 30 square millimeters.
14. The method of claim 8 further comprising:
providing bone ingrowth surfaces on a lower portion of the barrier structure and a plurality of stem micro struts; and
receiving bone material into the bone ingrowth surfaces on the lower portion of the barrier structure and the plurality of stem micro struts.
15. The method of claim 8 further comprising:
forming helical threads on external surfaces of the stem of the bone insert;
rotating the bone insert relative to the bone to screw the bone insert into the bone.
16. A method for coupling a bone insert to a bone comprising:
providing the bone insert having a cap having a tool recess, the cap having interdigitation surfaces, a barrier structure coupled to a lower portion of the cap and an elongated stem having bone ongrowth surface features, the elongated stem extends downward from the barrier structure;
providing an insert tool having a handle coupled to the proximal portion of the insert tool, a shaft coupled to the handle, and a driver on a distal end of the shaft;
inserting the driver of the insert tool into the tool recess in the cap of the bone insert;
inserting the stem of the bone insert into the bone using the insert tool;
placing the barrier structure against the bone;
removing the driver of the insert tool from the recess in the cap of the bone insert;
placing a bone implant against the cap;
pouring liquid poly(methyl methacrylate) cement onto the interdigitation surfaces on the cap;
blocking the liquid poly(methyl methacrylate) cement from flowing through the barrier structure into the elongated stem of the bone insert; and
curing the liquid poly(methyl methacrylate) cement to bond the bone implant to the cap.
17. The method of claim 16 further comprising:
drilling the bone with a stepped drill bit;
wherein the stem is inserted into a hole in the bone surface and the barrier is placed against a step in the hole formed by the stepped drill bit.
18. The method of claim 16 further comprising:
locking the driver to the recess in the cap of the bone insert; and
extracting the bone insert from the bone using the insert tool.
19. The method of claim 16 further comprising:
forming helical threads on external surfaces of the stem of the bone insert;
wherein the inserting of the stem of the bone insert into the bone surface includes rotating the bone insert in a first rotational direction to screw the bone insert into the bone using the insert tool.
20. The method of claim 16 further comprising:
placing the bone implant against the cap at a focal point contact area that is less than 30 square millimeters.