Orthopaedic implants including peripheral
This disclosure relates to orthopaedic implants and methods for repairing bone defects and restoring functionality to a joint. The implants disclosed herein include augment geometries that may approximate a surface contour or bone void along a surgical site and include patterns of peripheral apertures that may be utilized for improved fixation of the implants at the surgical site.
1. An orthopaedic implant comprising:
a baseplate including a plate body extending along a longitudinal axis between a front face and a rear face, and including an anchoring stem extending outwardly from the rear face;
wherein the plate body includes a main body portion establishing the front face and includes a wedge-shaped augment portion extending outwardly from the main body portion to establish an augment face section of the rear face;
wherein the augment face section is arranged transversely relative to the longitudinal axis, first and second reference planes are arranged perpendicular to each other and extend along the longitudinal axis, and the first reference plane extends through a maximum thickness of the augment portion to bisect the rear face along the augment face section; and
wherein all peripheral apertures of the baseplate arranged about the longitudinal axis and dimensioned to receive respective fasteners for securing the baseplate to bone are circumferentially offset from both of the first and second reference planes.
2. The implant as recited in claim 1 , wherein a perimeter of the plate body is substantially circular.
3. The implant as recited in claim 1 , wherein the anchoring stem extends along the longitudinal axis.
4. The implant as recited in claim 1 , wherein the peripheral apertures are substantially equally distributed about the longitudinal axis.
5. The implant as recited in claim 4 , wherein the peripheral apertures include a total of four peripheral apertures.
6. The implant as recited in claim 1 , wherein a third reference plane extends along the longitudinal axis such that the first and third reference planes establish an acute angle, and a pair of the peripheral apertures are circumferentially arranged along the third reference plane.
7. The implant as recited in claim 6 , wherein the acute angle is greater than 0 degrees but is less than 45 degrees.
8. The implant as recited in claim 6 , wherein the acute angle is between 30 degrees and 60 degrees.
9. The implant as recited in claim 8 , wherein the peripheral apertures include a total of four peripheral apertures.
10. The implant as recited in claim 9 , wherein the four peripheral apertures are substantially uniformly distributed about the longitudinal axis.
11. The implant as recited in claim 1 , wherein the rear face includes a second face section arranged substantially perpendicular to the longitudinal axis, and the augment face section and the second face section are joined at an interface to establish an obtuse angle.
12. The implant as recited in claim 11 , wherein the obtuse angle is between 140 degrees and 170 degrees.
13. The implant as recited in claim 1 , further comprising a glenosphere including an articulating surface having a generally convex geometry, and wherein the glenosphere is secured to the baseplate adjacent the front face.
14. The implant as recited in claim 13 , wherein the glenosphere includes a recess dimensioned to at least partially receive the main body portion of the baseplate.
15. The implant as recited in claim 14 , wherein a perimeter of the main body portion of the baseplate is dimensioned to cooperate with a perimeter of the recess to establish a Morse taper connection.
16. The implant as recited in claim 1 , wherein the augment portion extends across a full width of the main body portion.
17. The implant as recited in claim 1 , wherein the baseplate includes a plurality of recesses interspersed with the peripheral apertures, the recesses extend inwardly from the front face but terminate prior to the rear face of the plate body, and the recesses are dimensioned to receive tooling for positioning the baseplate along a surgical site.
18. The implant as recited in claim 17 , wherein the plurality of recesses include a first pair of recesses along the first reference plane and a second pair of recesses along the second reference plane.
19. The implant as recited in claim 1 , wherein the anchoring stem extends outwardly from the augment face section of the rear face.
20. The implant as recited in claim 1 , wherein the baseplate is symmetrical on opposite sides of the first reference plane.
21. The implant as recited in claim 1 , wherein the augment face section of the rear face is substantially planar.
22. The implant as recited in claim 3 , wherein:
the longitudinal axis extends through the augment face section of the rear face;
and at least one of the peripheral apertures extends through the augment portion.
23. A kit for arthroplasty comprising:
a set of baseplates; and
a plurality of fasteners;
wherein each baseplate of the set of baseplates includes a plate body having a main body portion and a wedge-shaped augment portion that cooperate to establish a front face and a rear face of the plate body, and a plurality of peripheral apertures extending between the front and rear faces, wherein the peripheral apertures are dimensioned to receive respective ones of the fasteners to secure the plate body to bone, and wherein a first reference plane extends along a longitudinal axis of the plate body and extends through a maximum thickness of the augment portion to bisect the rear face along the augment portion; and
wherein the set of baseplates includes a first baseplate and a second baseplate, the peripheral apertures of the first baseplate are circumferentially distributed about the longitudinal axis to establish a first pattern such that one or more of the peripheral apertures extend along the first reference plane, and the peripheral apertures of the second baseplate are circumferentially distributed about the longitudinal axis to establish a second pattern, wherein the first and second patterns have a common circumferential spacing between the respective peripheral apertures, but the second pattern is circumferentially offset from the first pattern, and wherein the circumferential offset is measured by circumferential positions of the respective peripheral apertures in a circumferential direction from a point along the first reference plane relative to the longitudinal axis.
24. The kit as recited in claim 23 , wherein an anchoring stem extends outwardly from the rear face along the longitudinal axis, and further comprising:
a glenosphere including an articulating surface having a generally convex geometry, and the glenosphere releasably secured to a respective one of the baseplates adjacent the front face.
25. The kit as recited in claim 23 , wherein a perimeter of the main body portion is substantially circular, and the peripheral apertures of both the first pattern and the second pattern are substantially equally distributed about the longitudinal axis.
26. The kit as recited in claim 25 , wherein a second reference plane extends along the longitudinal axis and is perpendicular to the first reference plane, and the second pattern is established such that all peripheral apertures of the second baseplate that are arranged about the longitudinal axis and dimensioned to receive respective ones of the fasteners are circumferentially offset from both of the first and second reference planes.
27. The kit as recited in claim 26 , wherein:
the rear face includes a first face section and an augment face section, the first face section is arranged substantially perpendicular to the longitudinal axis, the augment face section is established along the augment portion such that the augment face section is arranged transversely relative to the longitudinal axis, and the first reference plane extends through the augment face section; and
the augment face section and the first face section are joined at an interface to establish an obtuse angle.
28. The kit as recited in claim 23 , wherein the fasteners are compression screws.