Kinematically aligned robotic total knee arthroplasty

1. A robotic surgical system comprising:

a robotic controller to control a robotic arm to move a tibia throughout a range of motion for a knee;

a sensor to obtaining a series of measurements of a gap distance for the knee throughout the range of motion; and

a processor to:

automatically determine, based on a 3D model and the series of measurements, a tibial resection location; and

automatically update a 3D plan for an orthopedic procedure on the knee with the tibial resection location.

2. The robotic surgical system of claim 1 , wherein the processor is further to preoperatively generate the 3D plan for an orthopedic procedure on the knee before controlling the robotic arm to move the tibia throughout the range of motion.

3. The robotic surgical system of claim 1 , wherein the robotic controller is further to cause the robotic arm to remove osteophytes from the tibia of the knee before controlling the robotic arm to move the tibia throughout the range of motion.

4. The robotic surgical system of claim 1 , wherein the processor is further to generate information indicative of an axis through a femur of the knee.

5. The robotic surgical system of claim 1 , wherein to update the 3D plan, the processor is further to generate a range of motion gap distance model based on the series of measurements, including a medial gap distance and a lateral gap distance at three or more locations along the range of motion.

6. The robotic surgical system of claim 5 , wherein the three or more locations occur every degree throughout the range of motion.

7. The robotic surgical system of claim 1 , wherein the tibial resection location is a tibial cut plane determined such that after the tibia is resected and an implant is inserted, the gap distance between a femur and the tibia of the knee is minimized throughout the range of motion.

8. The robotic surgical system of claim 1 , wherein to update the 3D plan, the processor is further to update a planned implant based on the series of measurements.

9. The robotic surgical system of claim 8 , wherein to update the planned implant, the processor is further to determine a minimum error from an ideal rectangle or trapezoid to the gap distance across the range of motion.

10. The robotic surgical system of claim 1 , wherein to determine the tibial resection location, the processor is further to use the series of measurements as an input to a machine learning engine, the machine learning engine trained using prior gap distance measurements and outcome information, and receive the tibial resection location as an output of the machine learning engine.

11. The robotic surgical system of claim 1 , wherein to obtain the series of measurements, the sensor is configured to determine position data for the robotic arm, and wherein the processor is to use the position data to evaluate the gap distance for the knee throughout the range of motion.

12. The robotic surgical system of claim 11 , wherein to control the robotic arm to move the tibia throughout the range of motion, the robotic controller is further to activate a force assist for the robotic arm.

13. The robotic surgical system of claim 11 , wherein to control the robotic arm to move the tibia throughout the range of motion, the robotic controller is to cause the robotic arm to move the tibia automatically and without surgeon interaction.

14. A method comprising:

using a processor of a robotic surgical system to perform operations comprising:

controlling a robotic arm to move a tibia throughout a range of motion for a knee;

obtaining a series of measurements of a gap distance for the knee throughout the range of motion;

determining, based on a 3D model and the series of measurements, a tibial resection location; and

updating a 3D plan for an orthopedic procedure on the knee with the tibial resection location.

15. The method of claim 14 , further comprising preoperatively generating a 3D plan for an orthopedic procedure on the knee before controlling the robotic arm to move the tibia throughout the range of motion.

16. The method of claim 14 , wherein updating the 3D plan includes generating a range of motion gap distance model based on the series of measurements, including a medial gap distance and a lateral gap distance at three or more locations along the range of motion.

17. The method of claim 14 , wherein determining the tibial resection location includes determining a tibial cut plane such that after the tibia is resected and an implant is inserted, the gap distance between a femur and the tibia of the knee is minimized throughout the range of motion.

18. A machine-readable medium including instructions, which when executed by a processor, cause the processor to perform operations to:

control a robotic arm to move a tibia throughout a range of motion for a knee;

obtain a series of measurements of a gap distance for the knee throughout the range of motion;

determine, based on the 3D model and the series of measurements, a tibial resection location; and

update a 3D plan for an orthopedic procedure on the knee with the tibial resection location.

19. The machine-readable medium of claim 18 , further comprising instructions to cause the processor to preoperatively generate a 3D plan for an orthopedic procedure on the knee before controlling the robotic arm to move the tibia throughout the range of motion.

20. The machine-readable medium of claim 18 , wherein the instructions to determine the tibial resection location include instructions that cause the processor to use the series of measurements as an input to a machine learning engine, trained using prior gap distance measurements and outcome information, and receiving the tibial resection location as an output of the machine learning engine.