Systems and methods for intra-operative image analysis

A system to determine an anatomical effect of an implant on a patient, the system comprising a processor and a display coupled to the processor, wherein the processor is configured to:

• acquire a preoperative image of a surgical site, wherein the preoperative image depicts at least a portion of a first bone and at least a portion of a second bone, the second bone capable of articulating with respect to the first bone;
• acquire an intraoperative image of the surgical site that depicts at least a portion of the first bone and the implant, wherein the intraoperative image is acquired subsequent to attachment of the implant to the second bone;
• determine a first anatomical landmark point on the second articulating bone in the intraoperative image and a corresponding first anatomical landmark point on the second bone in the preoperative image;
• register the intraoperative image and the preoperative image, wherein registration comprises aligning the first anatomical landmark point in the intraoperative image and the corresponding first anatomical landmark point in the preoperative image when the intraoperative image and the preoperative image are overlaid;
• determine a longitudinal axis for the second bone in the registered preoperative image;
• determine a longitudinal axis and a center of rotation for the second bone in the registered intraoperative image;
• determine an angular difference between the second bone in the registered preoperative image and the second bone in the intraoperative image based on:
• (i) the longitudinal axis in the registered preoperative image, and (ii) the longitudinal axis and the center of rotation in the registered intraoperative image;
• re-registering the intraoperative image and the preoperative image so that the first bone in the intraoperative image and the first bone in the preoperative image are aligned when the intraoperative image and the preoperative image are overlaid;
• determine a point of rotation of the second bone with respect to the first bone;
• bone in the re-registered intraoperative and preoperative images;
• determine a location of a corrected anatomical landmark point, wherein the location of the corrected anatomical landmark point determined based on a projected location of the first anatomical landmark point after the second bone in the
• re-registered intraoperative image is rotated about the point of rotation of the second bone by the angular difference;
• calculate parameters pertaining to a difference between a location of the first anatomical landmark point in the re-registered preoperative image and the location of the corrected anatomical landmark point;
• and
• initiate display of one or more of the calculated parameters on the display.

A non-transitory computer-readable medium comprising instructions to determine an anatomical effect of an implant on a patient, wherein the instructions configure a processor to:

• acquire a preoperative image of a surgical site, wherein the preoperative image depicts a first bone and a second bone, the second bone capable of articulating with respect to the first bone;
• acquire an intraoperative image of the surgical site that depicts the first bone and the implant, wherein the intraoperative image is acquired subsequent to attachment of the implant to at least a portion of the second bone;
• determine a first anatomical landmark point on the second bone in the intraoperative and a corresponding first anatomical landmark point on the second articulating bone in the preoperative image;
• register the intraoperative image and the preoperative image, wherein registration comprises aligning the first anatomical landmark point in the intraoperative image and the corresponding first anatomical landmark point in the preoperative image when the intraoperative image and the preoperative image are overlaid;
• determine a longitudinal axis for the second bone in the registered preoperative image;
• determine a longitudinal axis and a center of rotation for the second bone in the registered intraoperative image;
• determine an angular difference between the second bone in the registered preoperative image and the second bone in the registered intraoperative image based on:
• (i) the longitudinal axis in the registered preoperative image, and (ii) the longitudinal axis and the center of rotation in the registered intraoperative image;
• determine a point of rotation of the second bone with respect to the first bone in the re-registered intraoperative and preoperative images;
• determine a location of a corrected anatomical landmark point, wherein the location of the corrected anatomical landmark point is determined based on a projected location of the first anatomical landmark point after the second bone in the re-registered intraoperative image is rotated about the point of rotation of the second bone by the angular difference;
• calculate parameters pertaining to a difference between a location of the first anatomical landmark point in the re-registered preoperative image and the location of the corrected anatomical landmark point, and
• initiate display of one or more of the calculated parameters.