Compliant fixation for pelvis
View Patent ↗A pelvic implant assembly and associated methods. The implant assembly includes an acetabular component, and a compliant fixator coupling the acetabular component to the pelvis.
1. A pelvic implant assembly comprising:
an acetabular cup at least partially attachable to an acetabulum of the pelvis;
an acetabular bearing coupled to an inner surface of the acetabular cup; and
a compliant fixator implantable into the pelvis, the compliant fixator coupled to an outer surface of the acetabular cup, the compliant fixator including:
a sleeve;
a biasing element received and contained within the sleeve; and
a biasing mechanism operable to expand and contract the biasing element and provide a dynamic load to the pelvis, wherein the biasing element includes a plurality of Belleville washers, and the biasing mechanism includes a nut threadable on a portion of a traction rod axially passing through the sleeve and engageable to the pelvis;
a connector coupling the compliant fixator and the acetabular cup; and
a plate coupled to the connector.
2. The pelvic implant assembly of claim 1 , further comprising a curved surface coupling the connector and the compliant fixator.
3. The pelvic implant assembly of claim 1 , further comprising a conical surface coupling the connector and the compliant fixator.
4. The pelvic implant assembly of claim 1 , further comprising a prosthetic femoral head articulating with the acetabular bearing.
5. The pelvic implant assembly of claim 4 , further comprising a prosthetic femoral stem coupled to the femoral head.
6. The pelvic implant assembly of claim 1 , further comprising a pubic implant for coupling the acetabular cup to an opposing pubic bone.
7. The pelvic implant assembly of claim 6 , wherein the pubic implant comprises a clamping device for clamping a portion of the pubic bone.
8. A pelvic implant assembly comprising:
an acetabular cup at least partially attachable to an acetabulum of the pelvis;
an acetabular bearing coupled to an inner surface of the acetabular cup;
a compliant fixator implantable into the pelvis, the compliant fixator coupled to an outer surface of the acetabular cup, the compliant fixator including:
a sleeve;
a biasing element received and contained within the sleeve; and
a biasing mechanism operable to expand and contract the biasing element and provide a dynamic load to the pelvis, wherein the biasing element is a helical spring, and the biasing mechanism includes a nut threadable on a portion of a traction rod axially passing through the sleeve and engageable to the pelvis;
a connector coupling the compliant fixator and the acetabular cup; and
a plate coupled to the connector.
9. The pelvic implant assembly of claim 8 , further comprising at least one bone fixator for coupling the connector to the pelvis.
10. The pelvic implant assembly of claim 8 , further comprising a prosthetic femoral head articulating with the acetabular bearing.
11. A pelvic implant assembly comprising:
an acetabular cup having an outer bone-engaging surface and an inner bearing-engaging surface, the outer surface at least partially attachable to an acetabulum of the pelvis;
an acetabular bearing coupled to the inner surface of the acetabular cup;
a prosthetic femoral head articulating with the acetabular bearing;
a prosthetic femoral stem coupled to the prosthetic femoral head; and
a compliant fixator implantable into the pelvis and providing dynamic load to the pelvis, the compliant fixator including:
a sleeve;
a traction rod axially passing through the sleeve and engageable to the pelvis;
a helical spring coupled to the traction rod and received and contained within the sleeve; and
a nut threadably movable on a portion of the traction rod for compressing the helical spring;
a connector coupling the compliant fixator to an outer surface of the acetabular cup; and
a plate coupled to the connector.