Knee Resection Planning with LDFA and MPTA for Soft-Tissue Balance
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Solution Overview
Problem
Existing total knee arthroplasty techniques fail to achieve optimal soft tissue balancing and joint line restoration, leading to patient dissatisfaction and persistent pain despite improved implant survivorship.
Innovation Solution
A method involving the comparison of lateral distal femoral angle (LDFA) and medial proximal tibial angle (MPTA) to determine pre-disease alignment, allowing for precise kinematic realignment of the hip-knee-ankle angle (HKA) through resection plane determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard mechanical alignment technique is used, then implant mechanical environment is optimized, but soft tissue balancing and joint line restoration are compromised
Solution Approach 1:
The alignment process is segmented into two distinct phases: (1) determining pre-disease alignment parameters (LDFA, MPTA, HKA) through measurement and calculation, and (2) applying kinematic alignment based on these parameters. This segmentation allows optimization of both implant mechanical environment and soft tissue balancing by addressing each aspect in a structured sequence.
Solution Approach 2:
The invention performs preliminary measurement and calculation of alignment parameters (LDFA, MPTA, HKA) before the actual implantation procedure. By determining the pre-disease alignment state in advance through arthrographic imaging and mathematical computation, the surgeon can plan the kinematic alignment strategy beforehand, ensuring both implant stability and soft tissue balance.
2Ease of operation
If kinematic alignment technique is used, then soft tissue balancing is improved, but measurement accuracy and alignment precision are compromised
Solution Approach 1:
The invention introduces arthrographic imaging as an intermediary tool that enables precise measurement of alignment parameters (LDFA, MPTA, HKA) without requiring complex 3D imaging equipment. The arthrogram provides detailed visualization of joint space and alignment, serving as a mediator between the surgeon and the complex measurement task, thereby maintaining measurement precision while enabling kinematic alignment.
Solution Approach 2:
The invention replaces complex mechanical measurement systems (such as 3D imaging equipment and robotic arms) with a simpler arthrographic imaging-based measurement approach. By using 2D arthrogram images combined with mathematical calculations, the system achieves accurate determination of pre-disease alignment parameters without requiring expensive and complex mechanical measurement devices.
3Extent of automation
If proprietary mapping systems are used, then alignment determination is automated, but system complexity and cost are increased
Solution Approach 1:
The invention creates a simplified 2D representation (copy) of the complex 3D alignment problem through arthrogram images. By working with 2D images that capture the essential alignment parameters (LDFA, MPTA, HKA) and applying mathematical calculations, the system reproduces the alignment determination function without requiring complex 3D imaging systems or proprietary mapping hardware.
Data Source
AI summary
Provided herein are methods of performing knee surgery, which include comparing a lateral distal femoral angle (LDFA) of the knee with a medial proximal tibial angle (MPTA) of the knee and determining a pre-disease alignment of the knee therefrom. Additionally, prognostic and diagnostic methods for use in knee surgery as well as methods of determining an angle of resection for a distal femur and/or a proximal tibia during knee surgery are provided herein. Also provided is an apparatus for assisting a surgeon in performing surgery on a knee of a patient, the apparatus comprising a processor configured for performing the aforementioned methods. A computer-readable medium having stored thereon a computer program, which, when executed by a computer, causes the computer to perform the aforementioned methods is also provided.