Patient-Specific Articular Implants Using Pre-Operative Imaging Data
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Solution Overview
Problem
Traditional orthopedic implants often fail to match individual patient anatomy, leading to complications such as pain, discomfort, and unnatural joint movement due to the need for extensive bone removal during surgery.
Innovation Solution
Patient-specific and patient-engineered implants and guide tools are designed using imaging data to match the patient's unique anatomical features, including surface contours, curvatures, and alignments, allowing for better fit and reduced bone removal during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard off-the-shelf implants are used, then manufacturing cost and availability are improved, but fit to patient anatomy and natural joint movement deteriorate
Solution Approach 1:
Patient-specific implants are designed and manufactured before surgery based on pre-operative imaging data (CT or MRI scans). The implant design process begins months or years before the surgical procedure, allowing customization to match the patient's unique anatomy while still using standard manufacturing processes. This preliminary design and manufacturing action resolves the contradiction by enabling custom-fit implants without requiring complex on-demand manufacturing.
Solution Approach 2:
The implant design incorporates patient-specific anatomical features at critical locations such as the articular surface contours, condylar shapes, and bone interfaces. Rather than making the entire implant fully customizable, only the specific regions that contact the patient's anatomy are tailored to match their unique geometry, while other portions can use standardized designs. This selective customization maintains manufacturing efficiency while improving anatomical fit.
2Ease of operation
If extensive bone removal is performed to accommodate standard implants, then implant installation is simplified, but bone loss and joint damage worsen
Solution Approach 1:
The patient-specific implant design is determined before surgery using pre-operative imaging and planning. The exact amount and pattern of bone removal are calculated in advance to match the custom implant geometry, minimizing unnecessary bone resection. This preliminary planning allows surgeons to perform precise, minimal bone removal while ensuring the implant will fit perfectly, resolving the contradiction between surgical simplicity and bone preservation.
Solution Approach 2:
The traditional approach of forcing a standard implant onto prepared bone is replaced by adapting the implant design to match the patient's actual anatomy. Instead of using mechanical force or extensive bone removal to accommodate a fixed implant design, the implant geometry is customized to conform to the patient's bone structure, reducing the need for aggressive bone preparation while maintaining surgical feasibility.
3Device complexity
If traditional implant designs are used, then device complexity is reduced, but alignment accuracy and surgical precision deteriorate
Solution Approach 1:
Patient-specific alignment and positioning parameters are determined through pre-operative imaging and computerized planning. The implant design includes pre-calculated alignment features, orientation markers, and positioning elements that ensure accurate placement. This preliminary determination of alignment parameters allows for high surgical precision without requiring complex intraoperative adjustments or sophisticated surgical techniques.
Solution Approach 2:
The patient's actual bone anatomy is digitally captured and replicated in the implant design through 3D modeling software. The implant is essentially a physical copy or negative of the patient's unique anatomical structures, ensuring perfect geometric matching. This digital copying process enables precise alignment and positioning while maintaining relatively simple implant geometries that directly mirror the patient's anatomy rather than requiring complex alignment mechanisms.
Data Source
AI summary
Methods and devices are disclosed relating improved articular models, implant components, and related guide tools and procedures. In addition, methods and devices are disclosed relating articular models, implant components, and/or related guide tools and procedures that include one or more features derived from patient-data, for example, images of the patient's joint. The data can be used to create a model for analyzing a patient's joint and to devise and evaluate a course of corrective action. The data also can be used to create patient-adapted implant components and related tools and procedures.