Devices and methods for knee arthroplasty
First Claim
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1. A system comprising:
- a plurality of implants or trial implants, wherein each implant or trial implant is configured to be positioned between a femur and a tibia;
a reference device configured to be coupled with the femur or the tibia when an implant or trial implant of the plurality of implants or trial implants is positioned between the femur and the tibia, the reference device comprising an accelerometer or a gyroscope;
a surgical orientation device configured to be coupled with the femur or the tibia when the implant or trial implant is positioned between the femur and the tibia, the surgical orientation device comprising an accelerometer or a gyroscope;
a processor configured to;
gather measurements from the accelerometer or the gyroscope of the surgical orientation device or the reference device while positioning the tibia in a plurality of positions differing in flexion, axial rotation, and/or varus-valgus relative to the femur when the implant or trial implant is positioned between the femur and the tibia; and
perform calculations to convert the measurements from the accelerometer or the gyroscope of the reference device or the surgical orientation device to an output indicative of motion of the tibia and femur in one or more directions corresponding to a flexion direction, an axial rotation direction, and/or a varus-valgus direction to facilitate adjustment of the rotational alignment of the implant or trial implant positioned between the femur and the tibia.
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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.
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Citations
21 Claims
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1. A system comprising:
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a plurality of implants or trial implants, wherein each implant or trial implant is configured to be positioned between a femur and a tibia; a reference device configured to be coupled with the femur or the tibia when an implant or trial implant of the plurality of implants or trial implants is positioned between the femur and the tibia, the reference device comprising an accelerometer or a gyroscope; a surgical orientation device configured to be coupled with the femur or the tibia when the implant or trial implant is positioned between the femur and the tibia, the surgical orientation device comprising an accelerometer or a gyroscope; a processor configured to; gather measurements from the accelerometer or the gyroscope of the surgical orientation device or the reference device while positioning the tibia in a plurality of positions differing in flexion, axial rotation, and/or varus-valgus relative to the femur when the implant or trial implant is positioned between the femur and the tibia; and perform calculations to convert the measurements from the accelerometer or the gyroscope of the reference device or the surgical orientation device to an output indicative of motion of the tibia and femur in one or more directions corresponding to a flexion direction, an axial rotation direction, and/or a varus-valgus direction to facilitate adjustment of the rotational alignment of the implant or trial implant positioned between the femur and the tibia. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system comprising:
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a reference device configured to be coupled with a femur or a tibia, the reference device comprising an inertial sensor, wherein the inertial sensor of the reference device comprises an accelerometer and/or a gyroscope, wherein a mechanical axis of the femur or the tibia is calculated based at least in part from data from the inertial sensor of the reference device; a surgical orientation device configured to be coupled with a cutting block, the surgical orientation device comprising an inertial sensor, wherein the inertial sensor of the surgical orientation device comprises an accelerometer and/or a gyroscope, the surgical orientation device configured to display an angle of the surgical orientation device relative to the calculated mechanical axis; a processor configured to; gather measurements from one or more inertial sensors of the surgical orientation device or the reference device while positioning the tibia in a plurality of positions differing in flexion, axial rotation, and/or varus-valgus relative to the femur; and perform calculations to convert the measurements from the one or more inertial sensors to an output indicative of motion of the tibia and femur in one or more directions corresponding to a flexion direction, an axial rotation direction, and/or a varus-valgus direction; wherein the surgical orientation device or reference device is configured to guide the placement of the cutting block.
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18. A system comprising:
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a plurality of implants or trial implants, wherein each implant or trial implant is configured to be positioned between a femur and a tibia; a reference device configured to be coupled with the femur or the tibia when an implant or trial implant of the plurality of implants or trial implants is positioned between the femur and the tibia, the reference device comprising an accelerometer or a gyroscope; a surgical orientation device configured to be coupled with the femur or the tibia when the implant or trial implant is positioned between the femur and the tibia, the surgical orientation device comprising an accelerometer or a gyroscope; a processor configured to; gather measurements from the accelerometer or the gyroscope of the surgical orientation device or the reference device while positioning the tibia in a plurality of positions differing in flexion, axial rotation, and/or varus-valgus relative to the femur when the implant or trial implant is positioned between the femur and the tibia; and perform calculations to convert the measurements from the accelerometer or the gyroscope of the reference device or the surgical orientation device to an output indicative of motion of the tibia and femur in one or more directions corresponding to a flexion direction, an axial rotation direction, and/or a varus-valgus direction to facilitate implant selection by quantifying aspects of the knee joint when the implant or trial implant is positioned between the femur and the tibia. - View Dependent Claims (19, 20, 21)
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Specification