Method for locating the mechanical axis of a femur
First Claim
1. A method for determining a mechanical axis of a femur using a computer aided surgery system having an output device for displaying said mechanical axis, the method comprising:
- providing a position sensing system having a tracking device capable of registering instantaneous position readings and attaching said tracking device to said femur;
locating a center of rotation of a femoral head of said femur by moving a proximal end of said femur to a first static position, acquiring a fixed reading of said first static position, repeating said moving and said acquiring for a plurality of static positions; and
locating said centre by determining a central point of a pattern formed by said plurality of static positions;
digitizing an entrance point of said mechanical axis at a substantially central position of said proximal end of said femur;
joining a line between said entrance point and said center of rotation to form said mechanical axis; and
displaying said mechanical axis on an output device without reference to an image of said femur acquired pre-operatively or intra-operatively using a medical imaging device.
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Accused Products
Abstract
There is described a method for determining a mechanical axis of a femur using a computer aided surgery system having an output device for displaying said mechanical axis, the method comprising: providing a position sensing system having a tracking device capable of registering instantaneous position readings and attaching the tracking device to the femur; locating a center of a femoral head of the femur by moving a proximal end of the femur to a first static position, acquiring a fixed reading of the first static position, repeating the moving and the acquiring for a plurality of static positions; and locating the centre by determining a central point of a pattern formed by the plurality of static positions; digitizing an entrance point of the mechanical axis at a substantially central position of the proximal end of the femur; and joining a line between the entrance point and the center of rotation to form the mechanical axis.
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Citations
21 Claims
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1. A method for determining a mechanical axis of a femur using a computer aided surgery system having an output device for displaying said mechanical axis, the method comprising:
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providing a position sensing system having a tracking device capable of registering instantaneous position readings and attaching said tracking device to said femur; locating a center of rotation of a femoral head of said femur by moving a proximal end of said femur to a first static position, acquiring a fixed reading of said first static position, repeating said moving and said acquiring for a plurality of static positions; and
locating said centre by determining a central point of a pattern formed by said plurality of static positions;digitizing an entrance point of said mechanical axis at a substantially central position of said proximal end of said femur; joining a line between said entrance point and said center of rotation to form said mechanical axis; and displaying said mechanical axis on an output device without reference to an image of said femur acquired pre-operatively or intra-operatively using a medical imaging device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for determining a mechanical axis of a femur, the system comprising:
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a position sensing system having a tracking device adapted to register instantaneous position readings of said femur; an acquisition module adapted to acquire data from said position sensing system and store fixed readings of a plurality of static positions of a proximal end of said femur and a digitized reading of an entrance point of said mechanical axis; a computing module adapted to locate a center of a femoral head of said femur by determining a central point of a pattern formed by said plurality of static positions and joining a line between said entrance point and said center of a femoral head, thereby representing said mechanical axis; and an output device adapted to display said mechanical axis, wherein said mechanical axis is determined and displayed on said output device without reference to an image of said femur acquired pre-operatively or intra-operatively using a medical imaging device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification