Devices and methods for knee arthroplasty
First Claim
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1. A method for setting tibial implant rotation, comprising:
- coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;
positioning an implant on a resected surface of the tibia of the patient;
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;
comparing values based on output of the at least one inertial sensor indicative of tibio-femoral kinematics with tibio-femoral kinematic target values for one or more of flexion, axial rotation, and/or varus-valgus; and
quantitatively comparing the varus and valgus laxity.
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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.
625 Citations
19 Claims
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1. A method for setting tibial implant rotation, comprising:
- coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;
positioning an implant on a resected surface of the tibia of the patient;
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;
comparing values based on output of the at least one inertial sensor indicative of tibio-femoral kinematics with tibio-femoral kinematic target values for one or more of flexion, axial rotation, and/or varus-valgus; and
quantitatively comparing the varus and valgus laxity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;
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10. A method for setting tibial implant rotation, comprising:
- coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;
positioning an implant between the tibia and the femur;
moving the leg to gather a measurement from the at least one inertial sensor;
comparing information based on the measurement with a target value of tibio-femoral kinematics; and
quantitatively comparing the varus and valgus laxity. - View Dependent Claims (11, 12, 13, 14, 15, 16)
- coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;
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17. A method for setting tibial implant rotation, comprising:
- coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;
moving the leg to gather one or more measurements from the at least one inertial sensor in one or more positions differing in flexion, axial rotation, and/or varus-valgus relative to the femur;
comparing a value based on the one or more measurements indicative of tibio-femoral kinematics with a tibio-femoral kinematic target value for one or more of flexion, axial rotation, and/or varus-valgus; and
quantitatively comparing the varus and valgus laxity. - View Dependent Claims (18, 19)
- coupling at least one inertial sensor with at least one of a tibia and a femur of a leg of a patient;
Specification