Patient-Specific Bone Preparation for Consistent Implant Fixation
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Solution Overview
Problem
Cementless orthopedic implants face variability in stability due to differing bone quality among patients, leading to inconsistent press-fit and potential micromotion, which affects long-term implant performance and biologic ingrowth.
Innovation Solution
Utilizing preoperative and intraoperative bone quality data from imaging techniques like CT, MRI, and x-ray to optimize bone preparation and implant fixation feature parameters, ensuring a consistent press-fit by adjusting the volume of bone removal and interference between the implant and bone based on individual bone properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standardized bone preparation approach is used for all patients, then the surgical process is simple and quick, but the implant stability varies due to individual bone quality differences
Solution Approach 1:
The patent applies local quality by customizing bone preparation parameters specifically for the implant fixation feature location based on patient-specific bone quality data. The system determines patient-specific bone preparation parameters including resection volume, interference fit, and press-fit characteristics tailored to the local bone properties at the fixation feature site, rather than applying uniform preparation across all patients.
Solution Approach 2:
The patent implements parameter changes by adjusting bone preparation parameters (resection volume, interference fit, press-fit characteristics) based on patient-specific bone quality measurements. The system modifies these parameters preoperatively or intraoperatively to optimize the engagement between fixation features and bone, ensuring consistent implant stability despite variations in patient bone quality.
2Manufacturing precision
If bone quality is measured and used to customize bone preparation, then consistent press-fit is achieved, but additional measurement and planning time is required
Solution Approach 1:
The patent applies preliminary action by performing bone quality assessment and determining patient-specific bone preparation parameters preoperatively using imaging data (CT, MRI, or x-ray). This allows the optimization of fixation feature engagement parameters before surgery, enabling consistent press-fit during the actual implantation procedure without adding significant intraoperative time.
Solution Approach 2:
The patent replaces manual bone quality assessment and preparation planning with automated image-based measurement and computational analysis. The system uses imaging data to objectively quantify bone quality parameters and automatically determines optimal bone preparation settings, reducing the time and expertise required for preoperative planning compared to traditional manual methods.
3Reliability
If more bone is removed to ensure engagement in low-density bone, then fixation feature engagement is improved, but implant stability decreases due to reduced bone support
Solution Approach 1:
The patent implements parameter changes by precisely controlling the bone resection volume and preparation characteristics based on patient-specific bone density measurements. The system calculates the optimal amount of bone to remove and the appropriate interference fit parameters to achieve sufficient fixation feature engagement while preserving adequate bone support, avoiding both under-preparation and over-preparation.
Solution Approach 2:
The patent applies local quality by tailoring the bone preparation parameters specifically to the bone quality at the fixation feature location. The system uses imaging data to assess local bone density and structural properties, then determines customized resection parameters that optimize engagement at the implant-bone interface without compromising the overall bone support structure.
4Strength
If less bone is removed to preserve bone support, then bone strength is maintained, but fixation feature engagement becomes insufficient
Solution Approach 1:
The patent implements parameter changes by optimizing the interference fit and press-fit characteristics of the bone preparation based on patient-specific bone quality. Rather than simply increasing or decreasing resection volume, the system adjusts preparation parameters such as interference fit magnitude, press-fit characteristics, and resection geometry to maximize fixation feature engagement while preserving bone support.
Data Source
AI summary
An optimized press-fit between a resected bone and an articular implant may, for instance, reduce undesirable qualities, including excess micromotion, stress transmission, and/or strain. By taking into account heterogeneous bone properties, the parameters of a bone resection can be determined as to optimize the press-fit between a resected bone and an articular implant. An optimized press-fit is obtained by determining ideal engagement characteristics corresponding to the fit between the fixation features of an articular implant and a bone. Then, taking into account a bone's heterogeneous properties, the parameters of a bone resection that would substantially achieve the determined ideal engagement characteristics are determined.