Dynamic Hip Arthroplasty Alignment via Gyroscopic Jig
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Solution Overview
Problem
Current hip replacement surgeries face complications due to poor alignment of prosthetic components, particularly in patients with inflexible lower backs, leading to dislocation issues, as traditional alignment methods do not adequately account for individual anatomy and require extensive preoperative and intraoperative imaging, increasing radiation exposure and procedural complexity.
Innovation Solution
A manipulable jig system is used during surgery to test and optimize the positioning of prosthetic acetabular cups and femoral heads based on the patient's anatomy, allowing for intraoperative adjustments and reduced imaging needs, utilizing a combination of manual manipulation and gyroscopic alignment to ensure accurate placement within the dynamic safe zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional static safe zone alignment (Lewinnek) is used for acetabular cup placement, then the procedure is simple and quick, but dislocation risk increases in patients with inflexible lower backs or spinal deformities
Solution Approach 1:
The patent transitions from static alignment (fixed angles of 40°±10° abduction and 15°±10° anteversion) to dynamic alignment that adapts to patient-specific anatomy and positioning. The system uses intraoperative imaging and computational algorithms to determine optimal cup orientation based on actual spinopelvic relationships, allowing the alignment parameters to change dynamically according to patient characteristics and surgical positioning.
Solution Approach 2:
The invention changes the alignment parameters from fixed standard values to variable values determined by patient-specific measurements. The system calculates dynamic safe zone parameters based on individual anatomy, including pelvic tilt, lumbar lordosis, and spinal flexibility, thereby adjusting the target abduction and anteversion angles to prevent dislocation in patients with inflexible spines or deformities.
2Measurement precision
If extensive preoperative imaging and computer navigation systems are used to determine dynamic safe zone, then alignment accuracy improves, but radiation exposure and procedural complexity increase
Solution Approach 1:
The system performs necessary imaging and calculations during the surgical procedure rather than requiring extensive preoperative workup. By acquiring intraoperative images and computing the dynamic safe zone in real-time, the system eliminates the need for multiple preoperative CT scans and specialized imaging studies, thereby reducing total radiation exposure while maintaining alignment precision.
Solution Approach 2:
The patent employs a multi-functional system that combines intraoperative imaging, computational analysis, and surgical guidance into a single integrated workflow. This universal approach replaces multiple separate procedures (preoperative CT, specialized x-rays, navigation setup) with one coordinated process that achieves the same alignment precision without cumulative radiation exposure from multiple imaging sessions.
3Manufacturing precision
If extensive preoperative workup and registration steps are performed, then alignment accuracy improves, but surgical time and procedural complexity increase
Solution Approach 1:
The system consolidates all necessary measurements, calculations, and planning into a single preoperative or intraoperative workflow that generates a personalized alignment guide. This preliminary computation of the dynamic safe zone eliminates the need for repeated intraoperative adjustments and registration steps, thereby reducing surgical time while maintaining placement precision.
Solution Approach 2:
The invention creates a virtual model or computational representation of the patient's anatomy and spinopelvic relationships that serves as a guide for surgical placement. This digital copy or simulation allows the surgical team to determine optimal alignment parameters without requiring physical trial-and-error adjustments during surgery, thereby reducing surgical time and complexity.
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
This approach reduces the risk of dislocation by customizing the prosthetic alignment to the patient's specific anatomy, minimizing radiation exposure, and simplifying the surgical process by eliminating the need for extensive preoperative and intraoperative imaging and registration steps.
Implementation Method 1
In another embodiment gyroscopes may be used to align the orientation of the test components and the prosthetic acetabular cup.
Data Source
AI summary
Systems and methods for placement of both the prosthetic acetabular cup and the prosthetic femoral head which takes account of the patient's particular anatomy, with inter-operative testing of the patient's body to find an optimum positioning (angles) for the components. The system allows a procedure with less pre-operative and inter-operative imaging, providing for reduced radiation exposure for doctors and patients.