Hinge detection for orthopedic fixation

One or more non-transitory computer-readable storage media having stored thereon instructions that, upon execution by one or more computing devices, cause the one or more computing devices to perform operations comprising:

• displaying first and second images of first and second anatomical structure segments with a fixation device attached thereto, the fixation device for correction of a deformity of the first and the second anatomical structure segments, the first and the second images captured from different positions and orientations with respect to one another, the fixation device comprising rings, struts and a plurality of hinges;
• receiving indications of first image hinge locations associated with the plurality of hinges in the first image;
• detecting hinge candidates in the second image having shapes associated with the plurality of hinges;
• identifying candidate second image hinge locations of the hinge candidates in the second image;
• calculating, based at least in part on the candidate second image hinge locations, adjusted second image hinge locations associated with the plurality of hinges in the second image;
• and
• determining, based at least in part on the first image hinge locations and the adjusted second image hinge locations, physical locations of the fixation device and the first and the second anatomical structure segments in three-dimensional space.

A computing system comprising:

• one or more computer processors;
• and
• one or more memories having stored therein instructions that, upon execution by the one or more computer processors, causes the one or more computer processors to perform operations comprising:
• displaying first and second images of first and second anatomical structure segments with a fixation device attached thereto, the fixation device for correction of a deformity of the first and the second anatomical structure segments, the first and the second images captured from different positions and orientations with respect to one another, the fixation device comprising rings, struts and a plurality of hinges;
• receiving indications of first image hinge locations associated with the plurality of hinges in the first image;
• detecting hinge candidates in the second image having shapes associated with the plurality of hinges;
• identifying candidate second image hinge locations of the hinge candidates in the second image;
• calculating, based at least in part on the candidate second image hinge locations, adjusted second image hinge locations associated with the plurality of hinges in the second image;
• and
• determining, based at least in part on the first image hinge locations and the adjusted second image hinge locations, physical locations of the fixation device and the first and the second anatomical structure segments in three-dimensional space.