Elbow prosthesis
An elbow prosthesis constructed in accordance to one example of the present teachings can include a capitellar implant having an articulating head and a stem. The articulating head can have a first articulating surface positioned generally between a lateral side and a medial side. A passage can extend through the articulating head from the lateral side to the medial side. The articulating head can define a counterbore formed at the lateral side and that is concentric with the passage. According to other features, the elbow prosthesis can include a coronoid implant that has a body and a stem. The body can have a superior articulating surface that includes a central ridge and an anterior buttress. The central ridge can be configured to accommodate articulation with a trochlea in an implanted position.
1. A prosthetic elbow comprising:
a coronoid implant including a body and a stem, the body having a superior articulating surface including a central ridge that extends in an anterior/posterior direction and an anterior buttress that extends in a medial/lateral direction, the central ridge configured to accommodate articulation with a trochlea in an implanted position, and the anterior buttress configured to limit subluxation of a humerus in cases of posterolateral elbow rotary instability, wherein a passage extends through the body from an anterior to a posterior side, and wherein the stem comprises a planar body that extends from a connecting end to a distal end.
2. The prosthetic elbow of claim 1 , further comprising a bone screw that extends into the passage of the body and has an end that extends proud from the body and is adapted to threadably engage a host ulna in an implanted position.
3. The prosthetic elbow of claim 2 , wherein the stem defines an opening therethrough, the opening adapted to accept boney ingrowth when implanted into an intermedullary canal of an ulna.
4. The prosthetic elbow of claim 3 , wherein the bone screw extends substantially perpendicular relative to a long axis of the stem.
5. The prosthetic elbow of claim 2 , wherein the body further comprises an extension portion that is adapted to extend generally laterally toward a radial head of a radius in an implanted position.
6. The prosthetic elbow of claim 5 , wherein the body comprises a triangular-wedge-like shape that extends between an anterior side, a posterior side, a medial side, and a lateral side, and wherein the extension portion extends from the lateral side.
7. The prosthetic elbow of claim 6 , wherein, when the coronoid implant is implanted in an ulna, the extension portion articulates with a radial head of the radius.
8. The prosthetic elbow of claim 6 , wherein the lateral side further comprises a first radial articulating surface positioned on the lateral side of the body.
9. The prosthetic elbow of claim 8 , further comprising a radial implant adapted to be implanted into a radius, the radial implant including a second radial articulating surface configured to articulate with the first radial articulating surface of the body of the coronoid implant.
10. The prosthetic elbow of claim 2 , wherein the body comprises a triangular-wedge-like shape that extends between an anterior side, a posterior side, a medial side, and a lateral side.
11. The prosthetic elbow of claim 10 , wherein the posterior side comprises a non-planar profile configured to engage a bone surface of the host ulna.
12. The prosthetic elbow of claim 10 , wherein the stem extends along an axis, and wherein the connecting end is attached to the posterior side of the body.
13. The prosthetic elbow of claim 12 , wherein the connecting end of the stem is curved.