DEVICES AND METHODS FOR KNEE ARTHROPLASTY

• US 20170196571A1
• Filed: 12/22/2016
• Published: 07/13/2017
• Est. Priority Date: 05/18/2012
• Status: Active Grant

• Current Assignee: Orthalign, Inc.
• Original Assignee: Orthalign, Inc.
• Inventors: van der Walt, Nicholas, Berend, Michael, Nielsen, Jonathan, Small, Scott Richard
• Granted Patent: US 10,716,580 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses

Abstract

The present invention provides, in certain embodiments, a device for positioning and orienting the femoral cutting block. The present invention also provides a device for setting rotation of sagittal resection for unicompartmental knee arthroplasty. The present invention further provides methods for setting the rotation of the tibial implant by kinematic measurements.

Claims

1-10. -10. (canceled)

11. A system for setting tibial implant rotation, comprising:

at least one orientation device configured to be coupled with one or both of a femur and a tibia;

a plurality of tibial trial components configured to be placed between the tibia and the femur; and

a processor configured to perform one or more of the following functions;

(i) gathering measurements from one or more inertial sensors of the orientation device(s);

(ii) performing calculations to convert the measurements from the inertial sensors to tibio-femoral kinematic information;

(iii) comparing the tibio-femoral kinematic information to target values of tibio-femoral kinematics; and

(iv) transmitting user output corresponding to one or both of the tibio-femoral kinematic information and the target vales.

12. A method for setting tibial implant rotation, comprising:

(a) coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;

(b) positioning an implant on a resected surface of the tibia of the patient;

(c) moving the leg to position the tibia in a plurality of positions differing in flexion, axial rotation, and/or varus-valgus relative to the femur; and

(d) comparing values based on output of the sensors indicative of tibio-femoral kinematics with tibio-femoral kinematic target values for one or more of flexion, axial rotation, and/or varus-valgus.

13. The method of claim 12, wherein comparing further comprises comparing values based on output of the sensors with a model of values for a healthy knee.

14. The method of claim 12, wherein comparing further comprises comparing values based on output of the sensors with one or more patient-specific values.

15. The method of claim 14, further comprising recording patient-specific values of tibio-femoral kinematics of the knee prior to resecting the tibia.

16. The method of claim 14, further comprising recording patient-specific values of tibio-femoral kinematics of a contralateral knee prior to resecting the tibia.

17. The method of claim 12, further comprising adjusting the rotation of the knee and repeating steps (c)-(d).

18. A method comprising:

completing tibial resection;

coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient; and

providing an inertial measurement with the knee in full extension, 90 degrees flexion or any other angle to which the knee can be flexed.

19. The method of claim 18, further comprising distal femoral resection.

20. The method of claim 18, further comprising displaying varus or valgus rotation.

21. The method of claim 18, further comprising displaying a numerical value for the rotation of the femur relative to the tibia.

22. The method of claim 18, further comprising displaying a numerical value for the rotation of the femur relative to the tibia with the knee in full extension.

23. The method of claim 18, further comprising displaying a numerical value for the rotation of the femur relative to the tibia with the knee in 90 degree flexion.

24. The method of claim 18, further comprising tensioning the femur using an instrument.

25. The method of claim 18, further comprising positioning the femur in rotational alignment with the tibia while aligning a drill guide.

26. The method of claim 18, further comprising aligning the drill guide with the tibial resection.

27. The method of claim 18, further comprising soft tissue release.