Metatarsophalangeal Arthroplasty Implant with Longitudinal Plate
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Solution Overview
Problem
Current arthroplasty devices for the metatarsophalangeal joint, such as the first MTPJ, face high failure rates due to loosening, misalignment, and migration, particularly in women, limiting patient satisfaction and mobility, and are not anatomically superior to arthrodesis, which is often the preferred surgical option.
Innovation Solution
The development of arthroplasty devices comprising an end plate, a longitudinal plate, and a stem with fasteners that secure the implant within the bone, providing enhanced stability and load-bearing capacity, and dual-component designs that allow for more anatomically tailored sizing and placement, reducing the likelihood of complications like loosening and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arthroplasty devices are used for MTPJ1 replacement, then the procedure can be performed, but high failure rates occur due to loosening, misalignment, and migration
Solution Approach 1:
The arthroplasty device is divided into multiple separate components: a metatarsal component with a stem and head, a phalanx component with a stem and condyles, and an interposing element. This segmentation allows each component to be independently sized and positioned to achieve optimal anatomical fit and stability, reducing misalignment and migration while maintaining high reliability
Solution Approach 2:
The interposing element is nested between the metatarsal component and phalanx component, creating a layered structure that provides stable articulation. The stems of both components are inserted into their respective bones, with the interposing element nested at the joint interface, ensuring proper alignment and preventing loosening through distributed load bearing
2Shape
If conventional arthroplasty devices are used, then the procedure can be performed, but anatomical accuracy is insufficient compared to arthrodesis
Solution Approach 1:
Each component of the arthroplasty device is designed with specific local geometries that match the anatomical features of the MTPJ1 joint. The metatarsal component has a head shape matching the metatarsal bone, the phalanx component has condyles matching the proximal phalanx, and the interposing element matches the natural joint space, achieving superior anatomical accuracy that improves patient satisfaction
Solution Approach 2:
The arthroplasty device preserves dynamic motion at the MTPJ1 joint through the articulated design of the metatarsal component, phalanx component, and interposing element. This allows the joint to move naturally during walking and other activities, providing anatomical accuracy and functional dynamics that improve patient satisfaction compared to rigid arthrodesis
Data Source
AI summary
A device for use during an arthroplasty procedure of a joint of a patient, the joint extending between a first joint end of a first bone and an abutting second joint end of a second bone of the patient. The device includes first and second components that can be mated together. The first component includes an attachment fitting configured for disposing over the first joint end of the first bone and a stem extending from the attachment fitting and suitable for extending along an intra-medullary canal of the first bone. The second component includes an end plate configured to mate with the attachment fitting and a longitudinal plate extending from the end plate and configured for disposing along a medial, longitudinal surface of the first bone. The device also includes at least one fastener for coupling the longitudinal plate to the first bone.