PREOPERATIVELY PLANNING AN ARTHROPLASTY PROCEDURE AND GENERATING A CORRESPONDING PATIENT SPECIFIC ARTHROPLASTY RESECTION GUIDE
First Claim
1. A method of manufacturing a custom arthroplasty resection guide, the method comprising:
- generating a three dimensional femur bone model from MRI knee coil two dimensional images, wherein the knee coil images include a knee region of a patient;
identifying a hip center and a femur knee center in MRI body coil two dimensional images, wherein the body coil images include a hip region of the patient and the knee region of the patient;
causing the three dimensional femur bone model and hip center and femur knee center to generally correspond with each other with respect to location and orientation;
defining relative to the three dimensional femur bone model a femoral mechanical axis via the femur knee center and the hip center;
identifying a most distal condylar point of the three dimensional femur bone model;
defining a distal plane that is orthogonal to the femoral mechanical axis in a coronal view of the three dimensional femur bone model, wherein the distal plane also passes through the most distal condylar point;
defining a resection plane that is parallel to the distal plane and proximally offset from the distal plane; and
using data associated with the resection plane to define a resection guide in the custom arthroplasty resection guide.
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Accused Products
Abstract
Methods of manufacturing a custom arthroplasty resection guide or jig are disclosed herein. For example, one method may include: generating MRI knee coil two dimensional images, wherein the knee coil images include a knee region of a patient; generating MRI body coil two dimensional images, wherein the body coil images include a hip region of the patient, the knee region of the patient and an ankle region of the patient; in the knee coil images, identifying first locations of knee landmarks; in the body coil images, identifying second locations of the knee landmarks; run a transformation with the first and second locations, causing the knee coil images and body coil images to generally correspond with each other with respect to location and orientation.
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Citations
25 Claims
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1. A method of manufacturing a custom arthroplasty resection guide, the method comprising:
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generating a three dimensional femur bone model from MRI knee coil two dimensional images, wherein the knee coil images include a knee region of a patient; identifying a hip center and a femur knee center in MRI body coil two dimensional images, wherein the body coil images include a hip region of the patient and the knee region of the patient; causing the three dimensional femur bone model and hip center and femur knee center to generally correspond with each other with respect to location and orientation; defining relative to the three dimensional femur bone model a femoral mechanical axis via the femur knee center and the hip center; identifying a most distal condylar point of the three dimensional femur bone model; defining a distal plane that is orthogonal to the femoral mechanical axis in a coronal view of the three dimensional femur bone model, wherein the distal plane also passes through the most distal condylar point; defining a resection plane that is parallel to the distal plane and proximally offset from the distal plane; and using data associated with the resection plane to define a resection guide in the custom arthroplasty resection guide. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of manufacturing a custom arthroplasty resection guide, the method comprising:
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generating a three dimensional tibia bone model from MRI knee coil two dimensional images, wherein the knee coil images include a knee region of a patient; identifying an ankle center and a tibia knee center in MRI body coil two dimensional images, wherein the body coil images include an ankle region of the patient and the knee region of the patient; causing the three dimensional tibia bone model and ankle center and tibia knee center to generally correspond with each other with respect to location and orientation; defining relative to the three dimensional tibia bone model a tibial mechanical axis via the tibia knee center and the ankle center; identifying a condylar point of the three dimensional tibia bone model; defining a proximal plane that is orthogonal to the tibial mechanical axis in a coronal view of the three dimensional tibia bone model, wherein the proximal plane also passes through a condylar point; defining a resection plane that is parallel to the proximal plane and distally offset from the proximal plane; and using data associated with the resection plane to define a resection guide in the custom arthroplasty resection guide. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of manufacturing a custom arthroplasty resection guide, the method comprising:
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a) identify in a computer environment hip, knee and ankle centers in a first set of two dimensional images; b) generate in a computer environment a three dimensional knee model from a second set of two dimensional images; c) cause the three dimensional knee model and hip, knee and ankle centers to be positioned relative to each other in a global coordinate system generally as if the three dimensional knee model were generated from the first set of two dimensional images; d) preoperatively plan an arthroplasty procedure with the three dimensional knee model of step c) via a method including; defining a mechanical axis relative to the three dimensional knee model via a pair of points including the knee center and at least one of the hip center or ankle center; and defining a resection plane parallel to, and offset from, a reference plane that;
1) is orthogonal to the mechanical axis in a coronal view and
2) extends through a condylar point on the three dimensional knee model; ande) using data associated with the resection plane to define a resection guide in the custom arthroplasty resection guide. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification