Preoperative planning of bone cuts and joint replacement using radiant energy scan imaging
First Claim
1. A method of preoperative planning of surgical cuts of a selected bone in a body using a cutting guide having a guide surface defining the contour of a desired bone cut and a gauge member having a predetermined position relative to the guide surface and positionable adjacent a selected postion on the bone, comprising:
- selecting regions of the body in which the selected bone is located to be used in determining a desired positioning of the cutting guide relative to the bone during cutting;
subjecting the selected body regions to radiant energy to produce radiant energy responses that are characteristic of the body and the selected bone and are detectable externally of the body;
detecting produced radiant energy responses to obtain representations of the selected body regions, including representations of the corresponding regions of the individual bone; and
determining from the representations a selected position of the gauge member relative to the bone so that when the gauge member is placed adjacent the selected position on the bone, the guide surface is in the selected position relative to the bone.
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0 Petitions
Accused Products
Abstract
A method is disclosed for the preoperative planning of a total knee replacement. Guide tools having guide members which are adjustable for placement on selected positions of the femur and tibia are used for locating the position of desired bone cuts defined by a cutting guide surface existing on the guide member. Selected regions of the femur and tibia are scanned by computed tomographic techniques to provide images of these regions. The respective centers of the femur head, distal femur, proximal tibia and distal tibia, or ankle joint are determined. The center points are then used to define a mechanical axis relative to which selected cuts are to be made corresponding to selected prostheses to be implanted. The CT scan representations are used to measure the desired location of the guide member cutting surface and the respective locations of guide members adjacent selected bone positions. These guide members are adjusted relative to the cutting surface prior to surgery. This provides for precise placement of the guide tools during surgery and the making of accurate and precise bone cuts conforming to the selected prostheses.
590 Citations
18 Claims
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1. A method of preoperative planning of surgical cuts of a selected bone in a body using a cutting guide having a guide surface defining the contour of a desired bone cut and a gauge member having a predetermined position relative to the guide surface and positionable adjacent a selected postion on the bone, comprising:
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selecting regions of the body in which the selected bone is located to be used in determining a desired positioning of the cutting guide relative to the bone during cutting; subjecting the selected body regions to radiant energy to produce radiant energy responses that are characteristic of the body and the selected bone and are detectable externally of the body; detecting produced radiant energy responses to obtain representations of the selected body regions, including representations of the corresponding regions of the individual bone; and determining from the representations a selected position of the gauge member relative to the bone so that when the gauge member is placed adjacent the selected position on the bone, the guide surface is in the selected position relative to the bone. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of preoperative planning of surgical joint replacement using bone-cutting guides, which joint has adjacent bone ends and each guide has a guide surface defining the contour of a desired bone cut and a gauge member having a predetermined position relative to the guide surface and positionable adjacent a selected position on a bone, comprising:
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choosing prostheses to be implanted on the adjacent bone ends for forming the replacement joint; selecting regions of the body in which the bones forming the selected joint are located, which regions are to be used in determining the positions of the bone-cutting guides for cutting during surgery, bone cuts for forming bone surfaces conforming with corresponding surfaces of the prostheses; subjecting the selected body regions to radiant energy to produce radiant energy responses that are characteristic of the body and the bones forming the joint and are detectable externally of the body; detecting produced radiant energy responses to obtain representations of the selected body regions including representations of the corresponding regions of the individual bones; and determining from the representations selected positions for the bone-cutting guides during cutting so that the protheses, when implanted on the resulting cut surfaces, form jointly the replacement joint. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification