Pelvic Referencing Guide for Hip Arthroplasty
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Solution Overview
Problem
Malposition of the acetabular component during total hip arthroplasty due to incorrect pelvic orientation and tilt, leading to post-operative adverse events such as dislocation and increased wear, as conventional mechanical guides do not account for patient-specific pelvic anatomy and orientation.
Innovation Solution
A pelvic referencing guide that uses anatomical reference points like the posterior superior iliac spines and inclinometers to accurately align and orient the pelvis in the lateral decubitus position, ensuring precise placement of the acetabular component by aligning a transverse pelvic line and assessing orientation in vertical planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mechanical guides are used for acetabular cup positioning, then the surgical procedure can be performed, but the accuracy of pelvic orientation assessment is insufficient leading to malpositioning
Solution Approach 1:
The patent replaces conventional visual and manual mechanical assessment methods with an inclinometer-based measurement system. The inclinometer provides objective quantitative data on pelvic tilt angles, substituting the subjective visual estimation with precise mechanical measurement, thereby improving both measurement precision and placement reliability
Solution Approach 2:
The patent introduces reference marks (such as the transverse pelvic line connecting PSIS points) as intermediaries between the pelvic anatomy and the measurement instrument. These reference marks provide a standardized interface for the inclinometer to measure pelvic orientation accurately, serving as a mediator that translates complex anatomical relationships into measurable parameters
2Measurement precision
If the surgeon visually aligns the pelvis without instruments, then the procedure is simple and quick, but the pelvic alignment accuracy is insufficient
Solution Approach 1:
The patent divides the complex task of pelvic alignment into discrete, manageable components: identifying anatomical landmarks (PSIS points), establishing reference lines (transverse pelvic line), and measuring specific angles (pelvic tilt) with the inclinometer. This segmentation transforms a complex visual estimation task into a series of simple, standardized steps that maintain procedural simplicity while improving accuracy
Solution Approach 2:
The patent performs preliminary actions by pre-establishing reference marks on the patient's skin (such as the transverse pelvic line) before the actual acetabular cup insertion. This preliminary alignment framework is set up in advance, allowing the surgeon to quickly reference pre-defined anatomical orientations during the critical implantation phase without adding complexity to the main procedure
3Reliability
If no pelvic orientation correction is applied, then the surgical procedure is faster, but post-operative adverse events increase
Solution Approach 1:
The inclinometer provides real-time feedback on pelvic tilt angles during the surgical procedure. This feedback mechanism allows the surgeon to immediately assess whether the pelvis is in the correct orientation and make adjustments as needed, ensuring accurate component placement while minimizing the time required for corrections later. The quantitative feedback replaces uncertain visual estimation with precise measurement
Solution Approach 2:
The patent focuses on measuring and correcting specific parameters (pelvic tilt angle, pelvic rotation) that directly influence acetabular cup orientation. By identifying and adjusting these critical parameters using the inclinometer, the surgeon can efficiently correct pelvic positioning to prevent post-operative adverse events without requiring extensive time-consuming adjustments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of acetabular component placement, reducing post-operative adverse events by allowing for precise correction of pelvic tilt and rotation, thereby minimizing dislocation and wear.
Implementation Method 1
an inclinometer for indicating the orientation of the transverse pelvic line in at least one vertical plane
Data Source
AI summary
The present invention relates generally to the field of orthopedics, and more particularly to a pelvic referencing guide and methods of using the guide in orthopaedic surgery, specifically total hip arthroplasty.