Method and apparatus for judging implant orientation data

Patent metadata

Field	Value
Publication number	US-10743936-B2
Application number	US-201515508764-A
Country	US
Kind code	B2
Filing date	May 8, 2015
Priority date	May 8, 2015
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A data processing method performed by a computer for judging implant orientation data representing an orientation of a first implant part relative to a first bone, the first implant part being part of an implant pair which further comprises a second implant part for a second bone, the implant pair being envisaged to be implanted in a patient.

First claim

The invention claimed is:

1. A data processing method performed by a computer for judging implant orientation data representing an orientation of a first implant part relative to a first bone, the first implant part being part of an implant pair which further comprises a second implant part for a second bone, the implant pair configured to be implanted in a patient, comprising the steps of:
acquiring the implant orientation data;
acquiring second implant orientation data representing an orientation of the second implant part relative to the second bone;
acquiring implant shape data representing a shape of the first implant part and a shape of the second implant part;
acquiring activity data representing at least one desired activity of the patient to be possible after implanting the implant pair, wherein each of the at least one desired activity has an associated range of motion between the first bone and the second bone;
calculating a range of motion volume, which represents possible orientations between the first bone and the second bone over three rotational axes, from the implant orientation data, the second implant orientation data and the implant shape data;
displaying the range of motion volume and the associated range of motion corresponding to each of the at least one desired activity; and
judging the implant orientation data to be feasible if the associated range of motion corresponding to each of the at least one desired activity lies within the range of motion volume.

2. The method of claim 1 , wherein calculating the range of motion volume comprises the steps of:
calculating a zero joint orientation of an implant joint formed by the first implant part and the second implant part, in which the first bone and the second bone are in a neutral position relative to each other, from the implant orientation data and the second implant orientation data;
calculating an implant range of motion volume, which represents possible orientations between the first implant part and the second implant part relative to the zero joint orientation over the three rotational axes, from the implant shape data; and
using the implant range of motion volume as the range of motion volume.

3. The method of claim 1 , wherein the at least one desired activity comprises one or more higher priority activities and one or more lower priority activities, and the implant orientation data is judged to be feasible if the associated range of motion corresponding to each of the one or more higher priority activities lies within the range of motion volume.

4. The method of claim 1 , wherein the three rotational axes are the axes of flexion-extension rotation, adduction-abduction rotation and internal-external rotation.

5. The method of claim 1 , wherein the associated range of motion of each of the at least one desired activity is defined by one or more relative orientations between the first bone and the second bone.

6. The method of claim 1 , wherein the implant orientation data is obtained by one of tracking the first implant part and planning the orientation of the first implant part by a computing device.

7. The method of claim 1 , wherein displaying comprises displaying a sectional view of the range of motion volume.

8. The method of claim 7 , wherein displaying further comprises displaying a sectional view of the associated range of motion corresponding to each of the at least one desired activity in a same sectional plane as the range of motion volume.

9. A data processing method performed by a computer for judging implant orientation data representing an orientation of a first implant part relative to a first bone, the first implant part being part of an implant pair which further comprises a second implant part for a second bone, the implant pair configured to be implanted in a patient, comprising the steps of:
acquiring the implant orientation data;
acquiring second implant orientation data representing an orientation of the second implant part relative to the second bone;
acquiring implant shape data representing a shape of the first implant part and a shape of the second implant part;
acquiring activity data representing at least one desired activity of the patient to be possible after implanting the implant pair, wherein each of the at least one desired activity has an associated range of motion between the first bone and the second bone;
transforming the associated range of motion corresponding to each of the at least one desired activity into an implant range of motion which defines a corresponding range of motion between the first implant part and the second implant part, by use of the implant orientation data and the second implant orientation data;
calculating an implant range of motion volume, which represents possible orientations between the first implant part and the second implant part over three rotational axes, from the implant shape data;
displaying the implant range of motion volume and the implant range of motion corresponding to each of the at least one desired activity; and
judging the implant orientation data to be feasible if the implant range of motion corresponding to each of the at least one desired activity lies within the implant range of motion volume.

10. The method of claim 9 , further comprising calculating a zero joint orientation of an implant joint formed by the first implant part and the second implant part, in which the first bone and the second bone are in a neutral position relative to each other, from the implant orientation data and the second implant orientation data, wherein the implant range of motion volume is calculated relative to the zero joint orientation.

11. The method of claim 9 , wherein calculating the implant range of motion volume involves finding possible orientations in which the first implant part and the second implant part do not impinge.

12. The method of claim 11 , wherein a determination of whether or not the first implant part and the second implant part impinge is made by a collision detection of 3D models of the first implant part and the second implant part.

13. The method of claim 11 , wherein a determination of whether or not the first implant part and the second implant part impinge is made by an analytical analysis of the implant shape data.

14. The method of claim 9 , wherein the three rotational axes are the axes of flexion-extension rotation, adduction-abduction rotation and internal-external rotation.

15. The method of claim 9 , wherein the associated range of motion of each of the at least one desired activity is defined by one or more relative orientations between the first bone and the second bone.

16. The method of claim 9 , wherein the implant orientation data is obtained by one of tracking the first implant part and planning the orientation of the first implant part by a computing device.

17. The method of claim 9 , further comprising determining one or more of the at least one desired activity for which the associated range of motion or implant range of motion does not lie in the range of motion volume or implant range of motion volume, respectively.

18. The method of claim 9 , wherein the at least one desired activity comprises one or more higher priority activities and one or more lower priority activities, and the implant orientation data is judged to be feasible if the associated range of motion or the implant range of motion corresponding to each of the one or more higher priority activities lies within the range of motion volume or the implant range of motion volume, respectively

Assignees

• Smith & Nephew Inc
• Smith & Nephew Asia Pacific Pte Ltd
• Smith & Nephew Orthopaedics Ag

Inventors

• Dohmen Lars
• Schubert Mario
• Wiedenmann Anna

Classifications

• A61F2002/4633

  for selection of endoprosthetic joints or for pre-operative planning · CPC title

• A61B2034/104

  Modelling the effect of the tool, e.g. the effect of an implanted prosthesis or for predicting the effect of ablation or burring · CPC title

• A61B2034/102

  Modelling of surgical devices, implants or prosthesis · CPC title

• A61B2034/2051

  Electromagnetic tracking systems · CPC title

• A61B5/1118

  Determining activity level · CPC title