System and method for preoperative planning for total hip arthroplasty

A computer-implemented method comprising:

• accessing at least three images of a musculoskeletal structure of a patient and displaying the at least three images via a display device;
• wherein a first pair of images are of different views of a first functional position of a musculoskeletal structure of a patient, and a second pair of images are of the same view of different functional positions of a musculoskeletal structure of a patient;
• defining at least one reference axis of the musculoskeletal structure on at least one of the images;
• determining a positional change parameter of the musculoskeletal structure based on the second pair of images, the positional change parameter representing the positional change of the patient between the different functional positions of the second pair of images;
• determining a first spatial transformation between the images of the first pair of images and determining a second spatial transformation between the images of the second pair of images;
• rendering and overlaying a three dimensional (3D) implant for each image in a first implant position defined relative to the reference axes, and according to the first spatial transformation for the first pair of images and to the second spatial transformation and positional change parameter for the second pair or images, and overlay the 3D implant on the respective images;
• receiving input to define a second implant position for the 3D implant, the second implant position defined relative to the reference axis;
• and
• update, in at least near real time, the rendering and overlay accordingly for each image in the second implant position using each spatial transformation and positional change parameter.

A computer system comprising at least one processing unit and a memory coupled to the at least one processing unit, a storage device storing instructions that, when executed by the at least one processing unit, cause the computer system to:

• access a standing anteroposterior (AP) image, a standing lateral image, and a sitting lateral image of a musculoskeletal structure of a patient and display the images via a display device;
• receive respective axes coordinates on the standing AP image and standing lateral image respectively as input, and define reference axes of the musculoskeletal structure on the standing AP image and the standing lateral image based on the respective axes coordinates;
• receive respective tilt coordinates on the standing lateral image and the sitting lateral image respectively as input, and determine a change in tilt parameter between the standing AP image and the standing lateral image of the musculoskeletal structure based on the respective tilt coordinates;
• determine a spatial transformation between the standing AP image and the standing lateral image and a spatial transformation between the standing lateral image and the sitting lateral image;
• render and overlay a three dimensional (3D) implant for each of the standing AP image and the standing lateral image in a first position relative to the reference axes based on the reference axes and the spatial transformation between the standing AP image and the standing lateral image;
• render and overlay the 3D implant in the first position for the sitting lateral image based on the change in tilt parameter and the spatial transformation between the standing lateral image and the sitting lateral image;
• receive input representing a second position of the 3D implant;
• and
• render and overlay the 3D implant in the second position using each space transformation and the change in tilt parameter to update, in real time, each of the standing AP image, the standing lateral image and the sitting lateral image.