Knee Prosthesis Assembly With Ligament Link

• US 20100305709A1
• Filed: 05/27/2010
• Published: 12/02/2010
• Est. Priority Date: 09/29/2006
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Metzger, Robert, Stone, Kevin T., Uthgenannt, Brian A.
• Granted Patent: US 8,500,818 B2
• Time in Patent Office: Days
• US Class Current: 623/20.27
• CPC Class Codes: A61F 2/08 Muscles; Tendons; Ligaments sutures A61B17/04
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3868 with sliding tibial bearing
• CPC Class Codes: A61F 2/3886 for stabilising knees against anterior or lateral dislocations
• CPC Class Codes: A61F 2002/0852 Fixation of a loop or U-turn, e.g. eyelets, anchor having multiple holes
• CPC Class Codes: A61F 2002/0858 Fixation of tendon or ligament between anchor and bone, e.g. interference screws, wedges
• CPC Class Codes: A61F 2002/0882 Anchor in or on top of a bone tunnel, i.e. a hole running through the entire bone
• CPC Class Codes: A61F 2002/30383 made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
• CPC Class Codes: A61F 2002/30481 using a locking clip
• CPC Class Codes: A61F 2002/30688 Means for allowing passage or sliding of tendons or ligaments
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements

Abstract

A prosthetic knee joint assembly includes a femoral component and a bearing that supports articulation of the femoral component. The assembly further includes a tibial tray. Furthermore, the assembly includes a ligament link operably coupled to the tibial tray or the femoral component via a coupling component. The ligament link extending through the other of the tibial tray or the femoral component to couple to the respective one of the femur or tibia. The ligament link extends between first and second ends and includes an outer wall defining an interior longitudinal passage portion. First and second apertures extend through the wall. The first end extends through the first and second apertures and the longitudinal passage portion to define a first adjustable loop, and the second end extends through the first and second apertures and the longitudinal passage portion to define a second adjustable loop.

Claims

1. A prosthetic knee joint assembly for a knee joint with a tibia and a femur, the prosthetic knee joint assembly comprising:

a femoral component that engages the femur;

at least one bearing that supports articulation of the femoral component thereon;

a tibial tray that supports the at least one bearing and engages the tibia;

a ligament link coupling component included on one of the femoral component or the tibial tray; and

a ligament link operably coupled to the one of the femoral component or the tibial tray via the ligament link coupling component, the ligament link also extending through the other of the femoral component or the tibial tray to operably couple to the respective one of the femur or the tibia, the ligament link extending from a first end to a second end, the ligament link having an outer wall defining an interior longitudinal passage portion, the ligament link also having a first aperture passing through the outer wall and disposed between the first and second ends, the ligament link additionally having a second aperture passing through the outer wall and disposed between the first and second ends, the first end extending through the first and second apertures and the longitudinal passage portion to define a first adjustable loop, the second end extending through the first and second apertures and the longitudinal passage portion to define a second adjustable loop.

2. The prosthetic knee joint assembly of claim 1, wherein the first end also includes a first free end, wherein the second end also includes a second free end, the first free end pullable to reduce a size of the first adjustable loop, the second free end pullable to reduce a size of the second adjustable loop.

3. The prosthetic knee joint assembly of claim 1, wherein the first and second adjustable loops are adjustable to change a tension in the ligament link.

4. The prosthetic knee joint assembly of claim 1, wherein the ligament link coupling component is included on the tibial tray and includes a through hole that receives an adjustable loop of the ligament link.

5. The prosthetic knee joint assembly of claim 4, wherein the ligament link coupling component has an axis that extends through a superior surface of the tibial tray and through an inferior surface of the tibial tray.

6. The prosthetic knee joint assembly of claim 1, wherein the ligament link coupling component is included on the tibial tray and includes a groove that nestingly receives a portion of the ligament link.

7. The prosthetic knee joint assembly of claim 6, wherein the tibial tray includes an inferior, anterior edge, and wherein the groove is defined on the inferior, anterior edge.

8. The prosthetic knee joint assembly of claim 6, wherein the groove has an axis that is disposed at a positive, acute angle relative to a longitudinal axis of the tibia.

9. The prosthetic knee joint assembly of claim 1, wherein the ligament link coupling component is disposed on an anterior portion of the tibial tray.

10. The prosthetic knee joint assembly of claim 1, wherein the ligament link coupling component is included on the tibial tray, the ligament link coupling component including an eyelet that selectively closes to secure the ligament link to the tibial tray and that selectively opens to allow the ligament link to move into the eyelet.

11. The prosthetic knee joint assembly of claim 1, wherein the tibial tray includes a first ligament link coupling component and a second ligament link coupling component, the first and second ligament link coupling components spaced apart at a distance from each other.

12. The prosthetic knee joint assembly of claim 11, wherein the tibial tray defines a median plane, and the first and second ligament link coupling components are disposed on opposite sides of the median plane.

13. The prosthetic knee joint assembly of claim 1, wherein the ligament link includes a plurality of braided fibers.

14. The prosthetic knee joint assembly of claim 1, wherein the ligament link coupling component is included on the femoral component, the femoral component including a first condylar portion and a second condylar portion separated at a distance apart to define an intercondylar opening, the ligament link coupling component extending from at least one of the first and second condylar portions into the intercondylar opening.

15. The prosthetic knee joint assembly of claim 1, wherein the ligament link coupling component is included on the femoral component, and wherein the tibial tray defines an opening through which the ligament link extends to couple to the tibia.

16. The prosthetic knee joint assembly of claim 15, wherein the tibial tray defines a first opening and a second opening, the first and second openings disposed on opposite sides of a medial plane of the tibial tray.

17. The prosthetic knee joint assembly of claim 1, wherein the ligament link extends through the other of the femoral component or the tibial tray to operably couple directly to the respective one of the femur or the tibia.

18. The prosthetic knee joint assembly of claim 1, wherein the ligament link extends through the other of the femoral component or the tibial tray to operably couple to the respective one of the femur or the tibia via a resected anatomical ligament.

19. The prosthetic knee joint assembly of claim 1, wherein the first and second adjustable loops of the ligament link are both coupled to the same one of the femoral component or the tibial tray.

20. A method of implanting a prosthetic knee joint assembly comprising:

operably coupling a femoral component of the knee joint assembly to a femur of a patient;

operably coupling a tibial component of the knee joint assembly to a tibia of the patient;

operably coupling a ligament link to one of the femur or the tibia; and

operably coupling the ligament link directly to one of the tibial component or the femoral component via a ligament link coupling component included on the one of the tibial component or the femoral component, the ligament link extending from a first end to a second end, the ligament link having an outer wall defining an interior longitudinal passage portion, the ligament link also having a first aperture passing through the outer wall and disposed between the first and second ends, the ligament link additionally having a second aperture passing through the outer wall and disposed between the first and second ends, the first end extending through the first and second apertures and the longitudinal passage portion to define a first adjustable loop, the second end extending through the first and second apertures and the longitudinal passage portion to define a second adjustable loop.

21. The method of claim 20, further comprising selectively adjusting a tension of the ligament link by pulling on at least one of a first free end and a second free end of the ligament link to reduce a size of at least one of the first and second adjustable loops.

22. The method of claim 20, further comprising determining if an anatomical ligament is damaged, and resecting at least a portion of the anatomical ligament, and wherein operably coupling the ligament link to the one of the femur or the tibia includes operably coupling the ligament link to the resected anatomical ligament.

23. A prosthetic knee joint assembly for a knee joint of a patient with a tibia and a femur, the prosthetic knee joint assembly comprising:

a femoral component that engages the femur, the femoral component including a medial and lateral condyle portion connected by a patellar track portion, an intercondylar opening defined between the medial and lateral condyle portions;

at least one bearing that supports articulation of at least one of the medial and lateral condyle portions thereon;

a tibial tray that supports the at least one bearing and engages the tibia, the tibial tray including a plurality of coupling components, the plurality of coupling components disposed on an anterior portion of the tibial tray, the plurality of coupling components disposed on opposite sides of a medial plane of the tibial tray; and

a ligament link operably coupled to the tibial tray via the coupling component, the ligament link also operable to couple to the femur, the ligament link extending through the intercondylar opening, the ligament link extending from a first end to a second end and having an outer wall defining an interior longitudinal passage portion, the ligament link also including a first aperture passing through the outer wall and disposed between the first and second ends, the ligament link also including a second aperture passing through the outer wall and disposed between the first and second ends, the first end extending through the first and second apertures and the longitudinal passage portion to define a first adjustable loop and a first free end, the second end extending through the first and second apertures and the longitudinal passage portion to define a second adjustable loop and a second free end, the first and second free ends pullable to increase a tension in the ligament link.

24. A prosthetic knee joint assembly for a knee joint of a patient with a tibia and a femur, the prosthetic knee joint assembly comprising:

a femoral component that engages the femur, the femoral component including a first condylar portion and a second condylar portion separated at a distance apart to define an intercondylar opening, the femoral component including a ligament link coupling component extending from at least one of the first and second condylar portions into the intercondylar opening;

at least one bearing that supports articulation of the femoral component thereon;

a tibial tray that engages the tibia, the tibial tray including a superior surface that supports the at least one bearing thereon, the tibial tray including an opening; and

a ligament link operably coupled to the femoral component via the coupling component, the ligament link also extending through the opening of the tibial tray to operably couple to the tibia, the ligament link extending from a first end to a second end and having an outer wall defining an interior longitudinal passage portion, the ligament link also including a first aperture passing through the outer wall and disposed between the first and second ends, the ligament link also including a second aperture passing through the outer wall and disposed between the first and second ends, the first end extending through the first and second apertures and the longitudinal passage portion to define a first adjustable loop and a first free end, the second end extending through the first and second apertures and the longitudinal passage portion to define a second adjustable loop and a second free end, the first and second free ends pullable to increase a tension in the ligament link.