Acetabular Cup Orientation via Preoperative Virtual Planning
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Solution Overview
Problem
Existing computer-assisted surgery (CAS) methods for calculating the version and inclination of a prosthetic acetabular cup relative to a coronal radiographic plane are cumbersome, increasing patient discomfort and surgical procedure time.
Innovation Solution
A method and system that determine a coronal radiographic plane from a medical image of the pelvis, identify landmarks, and calculate the version and inclination of a virtual acetabular cup model based on its relationship with the coronal plane and landmarks, thereby simplifying the planning and execution of surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing CAS methods are used to calculate version and inclination relative to coronal radiographic plane, then calculation accuracy is improved, but patient discomfort and surgical procedure time increase
Solution Approach 1:
The system performs preoperative planning by determining the coronal radiographic plane and calculating version and inclination angles before surgery. Virtual models of the acetabular cup are positioned and oriented in advance, allowing the surgical team to have all measurements and positioning decisions ready before the patient enters the operating room, thus eliminating time-consuming intraoperative calculations
Solution Approach 2:
The system creates a virtual copy of the patient's pelvis and acetabular cup from medical images. This virtual model allows for accurate measurement and calculation of version and inclination angles without requiring physical manipulation or additional intraoperative imaging, thereby maintaining measurement precision while reducing surgical time
2Measurement precision
If existing CAS methods are used to calculate version and inclination relative to coronal radiographic plane, then calculation accuracy is improved, but patient discomfort increases
Solution Approach 1:
All necessary measurements, including identification of landmarks and calculation of version and inclination angles, are performed preoperatively using the patient's medical images. This eliminates the need for additional intraoperative manipulations or positioning that would cause patient discomfort, while maintaining accurate calculations based on the pre-determined coronal radiographic plane
Solution Approach 2:
The system uses a virtual model as an intermediary between the patient's anatomy and the surgical planning process. All measurements and calculations are performed on this virtual representation, eliminating the need for direct intraoperative manipulation or positioning of the patient to achieve accurate version and inclination measurements
3Productivity
If minimal intraoperative manipulations are used, then patient discomfort and surgical time are reduced, but calculation accuracy may be compromised
Solution Approach 1:
The coronal radiographic plane is determined and locked in during preoperative planning. All subsequent measurements of version and inclination are performed relative to this pre-established plane, ensuring that calculation accuracy is maintained without requiring additional intraoperative manipulations or repositioning of the patient
Solution Approach 2:
The virtual model preserves the precise geometric relationships and anatomical landmarks from the patient's medical images. By performing all calculations on this accurate virtual copy rather than requiring physical manipulation, the system maintains measurement precision while achieving minimal intraoperative intervention
Data Source
AI summary
A system includes a medical imaging device configured to collect an image of a bone and a computer programmed to present the image of the bone, enable locating of a plurality of landmarks of the bone via the image, and determine a version and inclination of an acetabular cup based on the plurality of landmarks of the bone.