3D Osteotomy Planning System for Lower Limb Alignment
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Solution Overview
Problem
Current osteotomy planning methods for correcting lower limb misalignment are limited by their reliance on 2D X-ray images, which fail to accurately account for the complex three-dimensional geometry of the tibia and femur, leading to potential misplacement of implants and screws, and compromising the stability and alignment of the osteotomy.
Innovation Solution
A computer-assisted method and system for planning osteotomy procedures using 3D models of the tibia and femur, which involves dynamic simulation to determine optimal bone cuts, hinge zones, and implant placement, ensuring accurate alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 2D X-ray images are used for osteotomy planning, then the diagnosis and initial alignment measurement can be obtained, but the three-dimensional geometry of the bone cannot be accurately represented, leading to potential misplacement of implants and screws
Solution Approach 1:
The patent transitions from 2D X-ray imaging to 3D surface scanning and modeling to capture the complete three-dimensional geometry of the bone. This dimensional upgrade allows accurate representation of complex bone surfaces and enables precise planning of osteotomy cuts and implant placement in three dimensions, eliminating the information loss inherent in 2D projections
2Ease of operation
If traditional 2D-based planning methods are used, then the procedure can be simpler to perform, but the precision of bone cut and implant placement is compromised
Solution Approach 1:
The patent creates an accurate digital 3D copy or virtual model of the patient's actual bone geometry through surface scanning. This virtual model allows for precise simulation and planning of osteotomy procedures, enabling high-precision bone cuts and implant placement planning while maintaining ease of operation through computer-based visualization and simulation tools
3Productivity
If the hinge zone geometry is not properly defined and preserved, then the osteotomy procedure can be performed more quickly, but the stability and resistance of the bone structure during distraction or closing is compromised
Solution Approach 1:
The patent performs preliminary 3D planning and simulation before the actual surgery to precisely define the hinge zone geometry and its optimal position. By pre-determining the exact location and dimensions of the hinge zone in the 3D model, the surgeon can quickly execute the procedure while ensuring the hinge zone is properly positioned to maintain bone structure stability during distraction or closing
4Productivity
If implant placement is not optimally planned in three dimensions, then the surgical procedure can be performed faster, but the alignment goal and overall implant resistance are compromised
Solution Approach 1:
The patent performs preliminary 3D planning and simulation to optimally position the implant and determine the precise location and orientation of screw holes before surgery. This advance planning ensures that the implant will achieve the desired alignment goal and provide adequate resistance, while the actual surgical placement can be executed efficiently by simply following the pre-planned positions
Data Source
AI summary
The present disclosure relates to a computer-assisted method for planning an osteotomy procedure on at least one bone selected from a tibia and a femur of a patient's lower limb to correct a misalignment of said lower limb, in which said bone is to be partially cut into two bone portions articulated by a hinge zone, said bone portions are to be distracted or closed until a deformed configuration of the bone and an implant is to be screwed to said bone portions to maintain the bone in said deformed configuration, comprising: •—obtaining an at least partial 3D model of the tibia and/or the femur and a 3D model of the implant; •—receiving at least one user input comprising at least one target alignment parameter; •—based on the at least partial 3D model of each bone and the at least one user input, implementing a dynamic simulation of each cut and of distraction or closing of the bone portions to compute a deformed model of each bone to be cut resulting from the simulated cut(s) and distraction or closing; •—based on the deformed bone model(s) and the at least partial 3D model of the implant, computing an optimal placement of the implant onto the deformed bone.