Prosthesis for a fractured long bone
The invention concerns a prosthesis comprising: a stem part comprising: a rod, configured for being inserted into a medullary cavity of a diaphyseal fragment of a fractured long bone, for securing the stem part to the diaphyseal fragment, and an epiphyseal end, fixedly secured to the rod by means of at least one linker leg of the stem part, so that a gap is formed between the epiphyseal end and the rod along said at least one linker leg; and an implant distinct from the stem part and comprising: an internal part located at least partially within the gap, and at least one fastener for fastening epiphyseal fragments of the fractured long bone to the stem part, said at least one fastener being secured to the internal part.
1. A prosthesis for a fractured long bone, the prosthesis comprising:
a stem part comprising:
a rod, configured for being inserted into a medullary cavity of a diaphyseal fragment of the fractured long bone, for securing the stem part to the diaphyseal fragment, and
an epiphyseal end, fixedly secured to the rod by means of at least one linker leg of the stem part, so that a gap is formed between the epiphyseal end and the rod along said at least one linker leg; and
an implant distinct from the stem part and comprising:
an internal part located at least partially within the gap, and
at least one fastener for fastening epiphyseal fragments of the fractured long bone to the stem part, said at least one fastener being secured to the internal part.
2. The prosthesis according to claim 1 , wherein said at least one fastener comprises a screw, positioned into the internal part.
3. The prosthesis according to claim 1 , wherein the internal part has an elastic tongue allowing snap-fitting of the internal part into the gap, for securing the internal part to the gap.
4. The prosthesis according to claim 1 , wherein the internal part comprises at least one expansible body, having:
a retracted configuration allowing insertion of the expansible body into the gap, and
an expanded configuration preventing extraction of the expansible body from the gap, thereby securing the expansible body to the gap, the expansible body being put in the expanded configuration by securing the fastener thereto.
5. The prosthesis according to claim 1 , wherein the implant comprises at least one exterior part, at least a partially located at the periphery of the stem part, along said at least one linker leg, said exterior part being secured to the internal part.
6. The prosthesis according to claim 5 , wherein:
the stem part defines a main axis passing through the rod, the gap and the epiphyseal end; and
said at least one exterior part comprises an axial through-opening, the stem part being inserted through the through-opening along the main axis so as to be at least partially wrapped by the exterior part for securing the exterior part to the stem part.
7. The prosthesis according to claim 1 , wherein the internal part comprises a synthetic plastic material.
8. The prosthesis according to claim 7 , wherein the synthetic plastic material of the internal part comprises Polyethylene or Poly-Ether-Ether-Ketone.
9. The prosthesis according to claim 1 , wherein the internal part comprises a mesh metallic material or a porous metallic material.
10. The prosthesis according to claim 9 , wherein the metallic material of the internal part comprises Titanium and/or Nitinol.
11. The prosthesis according to claim 1 , wherein at least a part of the implant, comprises a peripheral shell and at least one bone graft core received within the peripheral shell.
12. The prosthesis according to claim 11 , wherein said at least a part of the implant, which comprises the peripheral shell and said at least one bone graft core, is the internal part.
13. The prosthesis according to claim 11 , wherein the peripheral shell comprises a biomaterial.
14. The prosthesis according to claim 11 , wherein the peripheral shell comprises a degradable polymer or degradable metal.
15. The prosthesis according to claim 11 , wherein the peripheral shell comprises at least one of the following composites of materials: a composite of hydroxyapatite and tricalciumphosphate, a composite of polylactide-co-glycolide and tricalciumphosphate, a composite of poly-L-lactide and tricalciumphosphate.
16. The prosthesis according to claim 1 , wherein the implant comprises barbs protruding outwardly from the implant, outside of the gap.
17. The prosthesis according to claim 1 , wherein at least a part of the implant is obtained by additive manufacturing.
18. The prosthesis according to claim 1 , wherein the prosthesis is a shoulder prosthesis for a fractured humerus.