Shoulder Arthroplasty Component Design Using CT Scan Data
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Solution Overview
Problem
Current shoulder arthroplasty systems, including glenoid and humeral components, are not optimized based on anatomic distribution, leading to issues such as malposition, inadequate sizing, and increased risk of complications like glenoid perforation and component overhang, particularly in patients with arthritis and bone loss.
Innovation Solution
A method utilizing computed tomography scan data to accurately measure and orient reference lines on bone images, allowing for the manufacturing of prosthetic components with predetermined dimensions and features that align with individual patient anatomy, such as glenoid and humeral components with optimized widths, lengths, and angles, to ensure proper fit and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standardized glenoid component sizes are used, then manufacturing and inventory are simplified, but component fit and stability are compromised due to inadequate sizing based on anatomic distribution
Solution Approach 1:
The patent applies parameter changes by establishing specific dimensional relationships between glenoid component width and anatomical reference lines (neutral face plate line, coracoid line). The component width is defined as a predetermined percentage (e.g., 80-100%) of the measured anatomical distance, allowing customization based on patient anatomy while maintaining manufacturing precision through clear quantitative guidelines.
2Reliability
If larger glenoid components are used to improve fit and stability, then component stability is improved, but risk of glenoid perforation and neurovascular structure violation increases
Solution Approach 1:
The patent applies local quality by using patient-specific anatomical measurements to determine the appropriate glenoid component size. The neutral face plate line and coracoid line provide localized reference frameworks that account for individual variations in glenoid anatomy, allowing the component size to be precisely matched to the patient's specific bone structure rather than using a one-size-fits-all approach.
3Object-affected harmful factors
If smaller glenoid components are used to avoid perforation and overhang, then safety is improved, but component stability and fit are compromised
Solution Approach 1:
The patent applies preliminary action by performing preoperative CT scanning and measurement to establish the neutral face plate line and coracoid line before surgery. This allows the surgeon to calculate the precise glenoid component width needed (as a percentage of the measured anatomical distance) and select the appropriate component size before the actual implantation, ensuring optimal fit and stability while avoiding perforation and overhang.
4Device complexity
If conventional instrumentation is used, then device complexity is reduced, but malposition in version and inclination occurs
Solution Approach 1:
The patent applies mechanics substitution by replacing conventional mechanical alignment instrumentation with a computational approach based on CT scan data and anatomical reference lines. The neutral face plate line and coracoid line are determined through image processing and mathematical calculations rather than complex mechanical alignment devices, simplifying the instrumentation while improving positioning accuracy through precise digital measurement and planning.
Data Source
AI summary
Methods and devices are disclosed for the optimization of shoulder arthroplasty component design through the use of computed tomography scan data from arthritic shoulders.