DEVICES AND METHODS FOR KNEE ARTHROPLASTY
First Claim
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1. A system for cutting a tibia of a leg of a patient in a uni-condylar procedure, comprising:
- a guide pin having a first end configured to be embedded in a distal aspect of a femur and a second end configured to protrude from the femur when the first end is so placed; and
a sagittal saw guide having a first portion configured to couple with the second portion of the guide pin and a second portion comprising a saw registration feature,wherein when the first portion of the sagittal saw guide is coupled with the second portion of the guide pin, the second portion of the sagittal saw guide projects distally away from the guide pin to position the saw registration feature over the tibia in a generally sagittal plane.
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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.
39 Citations
17 Claims
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1. A system for cutting a tibia of a leg of a patient in a uni-condylar procedure, comprising:
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a guide pin having a first end configured to be embedded in a distal aspect of a femur and a second end configured to protrude from the femur when the first end is so placed; and a sagittal saw guide having a first portion configured to couple with the second portion of the guide pin and a second portion comprising a saw registration feature, wherein when the first portion of the sagittal saw guide is coupled with the second portion of the guide pin, the second portion of the sagittal saw guide projects distally away from the guide pin to position the saw registration feature over the tibia in a generally sagittal plane. - View Dependent Claims (2, 3)
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4. A method of cutting a tibia of a leg of a patient in a uni-condylar procedure, comprising:
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locating the mechanical axis of a femur based on output from at least one inertial sensor coupled with the leg; placing a pin in the femur at an orientation corresponding to the mechanical axis of the femur based on output from at least one inertial sensor; coupling a sagittal saw guide with the pin such that a saw registration feature is disposed over the tibia in a generally sagittal plane; and resecting the tibia along the saw registration feature; whereby the sagittal resection is made based on the orientation of the mechanical axis of the femur. - View Dependent Claims (5)
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6. A system for preparing a femur for a femoral cutting block, comprising:
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a first guide having a first portion configured to contact a posterior condyle surface and a second portion extending away from the first portion configured to be disposed adjacent to a resected distal femoral surface, the second portion having a drill guide feature spaced from the first portion a distance to provide a mounting position for a femoral cutting block; a second guide having a first portion having a spike member and a second portion extending away from the first portion, the second portion comprising a drill guide feature, the second guide having a linear structure configured to be aligned with a tibial plateau; whereby the system enables the formation of a plurality of holes for mounting a femoral cutting block to a femur. - View Dependent Claims (7)
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8. A method of preparing a femur for a femoral cutting block, comprising:
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forming resection planes on a distal portion of a femur and a proximal portion of a tibia; contacting a first portion of a first guide with a posterior condyle of the femur; positioning a second portion of the first guide over the resection plane of the femur; forming a first hole extending superiorly from the resection plane of the femur through the second portion of the first guide; coupling a first portion of a second guide with the first hole; positioning a second portion of the second guide such that a feature of the second guide is aligned with the resection plane of the tibia; and forming a second hole extending superiorly from the resection plane of the femur through the second portion of the second guide. - View Dependent Claims (9, 10)
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11. A system for setting tibial implant rotation, comprising:
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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.
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12. A method for setting tibial implant rotation, comprising:
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(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. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification