Knee Prosthesis Alignment via Epiphysary Axis Planning
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Solution Overview
Problem
Current knee replacement surgeries face limitations due to insufficient reproduction of individual knee kinematics, leading to instability and malalignment issues, particularly in mid-flexion, which affects the longevity and function of the implant.
Innovation Solution
A surgical method involving preoperative planning to identify and utilize the epiphysary axis of the tibia and the bisector axis of the femur to perform precise cuts, ensuring a customized prosthesis is aligned with the patient's unique anatomical and kinematic features, using cutting guides based on the mechanical axis to achieve perpendicular cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional knee replacement surgery is performed using standard alignment methods, then the surgical procedure can be completed with standard techniques, but the reproduction of individual knee kinematics is insufficient leading to instability and malalignment
Solution Approach 1:
The patent applies preliminary action by performing preoperative planning to identify the epiphysary axis and bisector axis before surgery, creating a customized surgical plan that accounts for individual patient anatomy. This allows the surgeon to achieve precise alignment that reproduces native knee kinematics, resolving the contradiction between using standard techniques and achieving precise individualized alignment.
2Reliability
If a customized prosthesis aligned with patient-specific anatomical features is implemented, then knee stability and function are improved, but the surgical planning and procedure complexity increases
Solution Approach 1:
The patent applies segmentation by breaking down the surgical process into distinct phases: preoperative planning to identify the epiphysary axis and bisector axis, intraoperative execution using cutting guides based on these axes, and postoperative outcomes. This structured approach manages the complexity of customized surgery by organizing it into manageable segments, making the complex procedure more controllable and reproducible.
3Manufacturing precision
If preoperative planning is performed to identify epiphysary axis and bisector axis, then the alignment precision is improved, but the surgical preparation time is increased
Solution Approach 1:
The patent applies preliminary action by performing the time-consuming task of identifying the epiphysary axis and bisector axis during preoperative planning rather than during the surgical procedure itself. This allows the actual surgery to proceed more efficiently using pre-determined alignment references, thereby reducing intraoperative time while maintaining high precision through the use of customized cutting guides based on these pre-identified axes.
Data Source
AI summary
The disclosure herein relates to various surgical methods for implanting a prosthesis in a patient. In particular, in some embodiments, a surgical method for preparing a knee of a patient to implant a customized knee prosthesis comprising: identifying epiphysary axis (2) of the patient tibia (1) by connecting the center of the tibial plateau with the center of the growth plate remnant on a preoperative planning; and performing a tibial cut (3) perpendicular to the epiphysary axis (2) of the tibia (1).