Modular Shoulder Arthroplasty System with Adjustable Offsets
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Solution Overview
Problem
Current shoulder arthroplasty systems face challenges such as poor bone quality leading to limited durability, risk of nerve injury, joint instability, and difficulty in revising or converting implants without causing bone fracture or loss, due to inadequate anatomical matching and modular design.
Innovation Solution
A modular and convertible shoulder arthroplasty system featuring a metaphyseal shell with eccentric engagement features and adjustable offsets, allowing for precise anatomical alignment and stable fixation without the need for extensive bone removal, enabling revision and conversion surgeries while minimizing bone damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stemmed arthroplasty systems are used to ensure stable fixation, then reliability is improved, but the risk of bone fracture and loss during revision surgery increases
Solution Approach 1:
The prosthesis is divided into modular components: a stem portion inserted into the medullary canal and a separate humeral head portion. This segmentation allows the stem to provide stable fixation while the head can be independently positioned and revised without removing the stem, thereby reducing bone fracture risk during revision surgery.
Solution Approach 2:
The system employs adjustable offset coupling mechanisms that allow dynamic adjustment of the humeral head position relative to the stem. This dynamic adaptability enables precise anatomical alignment while maintaining stable fixation, and facilitates easier revision by allowing position changes without stem removal.
2Ease of operation
If extensive bone removal is performed to accommodate traditional prostheses, then ease of operation is improved, but loss of substance increases
Solution Approach 1:
The prosthesis design concentrates bone interaction at specific locations: the stem engages the medullary canal with localized preparation, and the humeral head articulates with the glenoid. This localized approach minimizes extensive bone removal while ensuring proper positioning and stable fixation, preserving healthy bone tissue.
3Ease of operation
If fixed anatomical positioning is used to simplify implantation, then ease of operation is improved, but adaptability worsens
Solution Approach 1:
The offset coupling mechanism provides adjustable positioning of the humeral head relative to the stem, allowing surgeons to adapt the prosthesis to various anatomical configurations. This dynamic adjustment capability maintains implantation simplicity while significantly improving adaptability to individual patient anatomy.
Solution Approach 2:
The modular stem design with standardized interface can accommodate multiple humeral head configurations and positioning options, making the system universally applicable to different anatomical scenarios while maintaining straightforward implantation procedures through standardized components.
4Adaptability or versatility
If conversion to reverse arthroplasty is attempted with traditional systems, then adaptability is improved, but device complexity and surgical difficulty increase
Solution Approach 1:
The separable connection between stem and humeral head allows the humeral head to be removed and replaced with a reverse arthroplasty cup. This segmentation simplifies the conversion process by enabling component exchange without removing the stem, reducing surgical complexity compared to traditional systems where the entire prosthesis must be removed.
Solution Approach 2:
The adjustable offset coupling system's modular design facilitates easy reconfiguration for reverse arthroplasty by allowing different components to be exchanged at the modular interface, maintaining system adaptability while managing complexity through standardized connections.
Data Source
AI summary
Methods for achieving an anatomically accurate reconstruction with a modular arthroplasty assembly that includes a generally disc shaped coupler component having a prosthesis component side that includes a recess configured to interchangeably engage a prosthesis component selected from a concave cup and a convex head that is either hemispherical or hemielliptical.