Virtual 3D overlay as reduction aid for complex fractures

Patent metadata

Field	Value
Publication number	US-9508149-B2
Application number	US-201313900895-A
Country	US
Kind code	B2
Filing date	May 23, 2013
Priority date	May 23, 2012
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A method and device for assisting reduction for complex fractures includes the steps of receiving an x-ray image of a fractured bone having a plurality of bone fragments, identifying structural aspects of at least one of the bone fragments, adapting a virtual bone model to the imaged bone based on the identified structural aspects, and generating an overlay of the virtual bone model onto the x-ray image, with the virtual bone model aligned to the identified structural aspects. The device is adapted to perform the method.

First claim

The invention claimed is:

1. A method for assisting reduction for complex fractures, the method comprising:
receiving an x-ray image of a fractured bone having a plurality of bone fragments, a reference body connected to a bone fragment of the plurality of bone fragments of the fractured bone, the reference body having a plurality of radiopaque elements provided in a predetermined three-dimensional pattern within the reference body, the radiopaque elements spaced from the bone fragment;
utilizing the plurality of radiopaque elements of the reference body to register the location of the bone fragments;
identifying on the image at least one structural aspect of at least one of the bone fragments, the structural aspect selected from the group consisting of a point, a line, an arc, a centerpoint, an axis, a cylindrical surface, and a spherical surface;
adapting a virtual bone model selected from a database of non-fractured virtual bone models to the imaged fractured bone based on the at least one identified structural aspect;
using a computer to generate an overlay of the virtual bone model onto the x-ray image, with the virtual bone model aligned to the at least one identified structural aspect of the at least one bone fragment using the reference body; and
repositioning the plurality of bone fragments so that the bone fragments fit into the contour of the selected non-fractured vertical bone model.

2. The method of claim 1 , wherein the identification of the at least one structural aspects is performed automatically by the computer.

3. The method of claim 1 , wherein the at least one structural aspect is a longitudinal axis of the imaged bone.

4. The method of claim 1 , wherein the at least one structural aspect is a structural aspect of a joint portion of an imaged fractured bone.

5. The method of claim 1 , wherein the at least one structural aspect is associated with the reference body.

6. The method of claim 1 , further comprising the step of visualizing the generated computer overlay on a computer monitor.

7. The method of claim 1 , further comprising an input for the computer for manually identifying the structural aspect of a bone fragment and for adapting the virtual bone model to the imaged bone.

8. The method of claim 7 , further comprising a monitor for visualizing the overlay of the virtual bone model onto the x-ray image.

9. The method of claim 1 , wherein the computer has processing unit adapted to automatically perform the steps of identifying structural aspects of the bone fragment and adapting the virtual bone model to the imaged bone.

10. The method of claim 1 , further comprising a reference body adapted to be visible in the x-ray image of the fractured bone so as to identify the at lease one structural aspect of the at least one bone fragment to which structural aspect the reference body is associated.

11. The method as set forth in claim 1 wherein the reference body is coupled directly to the fractured bone.

12. A method for assisting reduction for complex femoral fractures, the method comprising the steps of:
receiving digital x-ray image of a fractured femur having a plurality of bone fragments, the image including a reference body connected to one of the plurality of bone fragments of the fractured femur, the reference body having a plurality of radiopaque elements provided in a predetermined three-dimensional pattern within the reference body, the radiopaque elements spaced from the bone fragment;
utilizing the plurality of radiopaque elements of the reference body in the digital x-ray image to register the location of the bone fragments;
identifying a longitudinal axis and a femoral head center of the fractured femur and at least one structural aspect of at least one of the bone fragments;
adapting a virtual femur model selected from a group of actual non-fractured femur models stored in a database to the imaged fractured femur based on the identified longitudinal axis and the structural aspects of the bone fragments,
using a computer to generate an overlay of the virtual femur model onto the x-ray image, with a longitudinal axis and a femoral head center of the virtual femur model aligned to the longitudinal axis, head center and the identified structural aspects of the fractured femur using the reference body; and
repositioning the bone fragments to an anatomically correct position by fitting the bone fragments within the contour of the overlaid virtual bone model.

13. The method of claim 12 , wherein the identification of structural aspects is performed by the computer automatically.

14. The method of claim 12 , wherein at least one of the structural aspects is an aspect of a joint of the imaged bone.

15. The method of claim 12 , wherein the at least one of the structural aspect is associated with the reference body.

16. The method of claim 12 , further comprising the step of visualizing the generated overlay on a computer monitor.

17. The method as set forth in claim 12 further comprising fixedly connecting a reference body to a bone fragment, the reference body comprising radiopaque elements wherein the three dimensional orientation of the reference body can be determined from a two dimensional image.

18. The method as set forth in claim 11 wherein the reference body is coupled to one of the bone fragments of the fractured bone.

Assignees

• Stryker Trauma Gmbh
• Stryker European Holdings I Llc

Inventors

• Simon Bernd
• Blau Arno

Classifications

• A61B2090/376

  using X-rays, e.g. fluoroscopy · CPC title

• G06T2207/20092

  Interactive image processing based on input by user · CPC title

• G06T19/20

  Editing of three-dimensional [3D] images, e.g. changing shapes or colours, aligning objects or positioning parts · CPC title

• G06T7/70

  Determining position or orientation of objects or cameras (camera calibration G06T7/80) · CPC title

• A61B2034/102

  Modelling of surgical devices, implants or prosthesis · CPC title