Hip Surgery Planning System for Leg Length Accuracy
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Solution Overview
Problem
During hip replacement surgery, there is a challenge in accurately determining and achieving the desired changes in leg length, offset, and anterior-posterior position, which can lead to unstable hip joints, discomfort, and the need for revision surgery.
Innovation Solution
The use of a surgical planning system that includes a User Interface engine, a library of digital templates of hip components, and a planning tool to select and position these templates on patient-specific volume or shape data, allowing for the computation of changes in leg length, offset, and AP position, and enabling a dynamic design and evaluation feedback loop during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional manual measurement methods are used during hip surgery, then the surgical process is simple and quick to perform, but the precision of leg length and offset determination is insufficient leading to unstable hip joints and discomfort
Solution Approach 1:
The system performs pre-operative planning and creates a virtual surgical model before the actual surgery. Digital templates of hip components are positioned on patient-specific volume data in advance, allowing leg length and offset changes to be computed and optimized before entering the operating room. This preliminary action ensures high measurement precision without adding complexity during the actual surgical procedure.
Solution Approach 2:
The system creates a virtual copy of the patient's hip anatomy using volume or shape data. Digital templates representing physical hip components are used as copies to simulate and evaluate different implant configurations. This virtual copying allows precise measurement of leg length and offset changes without requiring complex physical measurement devices during surgery.
2Reliability
If digital templates and virtual modeling are used to optimize hip component selection, then the accuracy of surgical outcomes is improved, but the complexity of the surgical planning system increases
Solution Approach 1:
The system implements a dynamic design and evaluation feedback loop where digital templates are positioned on patient-specific volume data, and the results are automatically evaluated for leg length and offset changes. The system provides feedback on whether the selected hip components and their positions will achieve the desired surgical outcomes, allowing iterative optimization before surgery. This automated feedback mechanism ensures high reliability without requiring complex manual evaluation procedures.
3Adaptability or versatility
If iterative adjustments are made during surgery to achieve desired leg length and offset, then the adaptability to patient-specific anatomy is improved, but the surgical time and need for revision surgeries increase
Solution Approach 1:
The system performs all necessary planning and component selection in advance using pre-operative volume or shape data. The optimal hip component configuration, position, and orientation are determined before surgery, with leg length and offset changes computed in advance. This eliminates the need for time-consuming iterative adjustments during surgery while maintaining full adaptability to the patient's specific anatomy through patient-specific virtual modeling.
Solution Approach 2:
The system replaces manual trial-and-error mechanical adjustments during surgery with automated computer-based planning and evaluation. The software automatically computes leg length and offset changes based on digital template positioning, substituting the need for repeated physical trials with implants. This dramatically reduces surgical time while maintaining customization to patient anatomy through automated optimization algorithms.
Data Source
AI summary
Systems and methods facilitate the planning and performance of hip and other surgeries. A computer model of a hip may be generated and displayed. A template of a hip component that replaces a native portion of the hip may be superimposed on the model. Changes in leg length, offset, or anterior-posterior (AP) position as well as a virtual distance between a landmark on the model and a location on the template may be determined. During surgery, a physical distance corresponding to the virtual distance may be obtained. The template may be moved relative to the model to match the physical distance, and new change values in leg length, offset, or anterior-posterior (AP) position may be determined. The new change values may be evaluated, and the surgery may proceed, or the process may be repeated using templates corresponding to alternative components.