Lubricious MTP Joint Implant Geometry for Bone-Preserving Mobility
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Solution Overview
Problem
Conventional metatarsophalangeal joint hemiarthroplasty procedures often result in pain, reduced mobility, and complications due to mismatched mechanical properties with cartilage and the removal of healthy native bone, failing to consider the unique geometry and natural articulation of the metatarsal head.
Innovation Solution
Implants with a lubricious bearing surface and unique geometry, including distinct curvatures and a dorsal orientation, are designed to articulate with native cartilage, preserving bone and reducing contact stresses, while utilizing an inlay technique to target cartilage damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional hemiarthroplasty procedures are performed, then joint pain is relieved, but mobility is reduced and bone is removed
Solution Approach 1:
The implant is divided into distinct segments: a head portion with articulating surface and a post portion for bone insertion. This segmentation allows the articulating surface to preserve mobility while the post provides stable fixation, resolving the contradiction between pain relief and mobility maintenance.
Solution Approach 2:
The implant features a lubricious bearing surface on the head portion that specifically targets the articulating area, providing localized low-friction movement. This local quality improvement maintains mobility while relieving pain at the joint interface without requiring extensive bone removal.
2Stability of the object's composition
If conventional hemiarthroplasty procedures are performed, then joint stability is improved, but mechanical properties mismatch with cartilage
Solution Approach 1:
The implant utilizes composite material properties with a lubricious bearing surface that mimics cartilage mechanics. This composite approach provides both joint stability through rigid fixation and mechanical property matching at the articulating surface, resolving the contradiction between stability and adaptability.
Solution Approach 2:
The implant changes the mechanical parameters at the articulating surface by introducing a lubricious coating with friction coefficients matching native cartilage. This parameter modification allows the implant to provide stability while adapting to cartilage mechanical properties, eliminating the mismatch problem.
3Object-affected harmful factors
If conventional hemiarthroplasty procedures are performed, then damaged cartilage is replaced, but healthy native bone is removed
Solution Approach 1:
The implant design extracts only the damaged cartilage portion and replaces it with the articulating surface, while preserving the healthy native bone through the inlay technique. The post portion fits into a prepared cavity without requiring extensive bone removal, thus minimizing bone loss while addressing cartilage damage.
Solution Approach 2:
The implant is designed to be inserted in a prepared cavity within the metatarsal head, allowing preliminary bone preparation that preserves healthy bone. The inlay technique requires creating a cavity only where needed, preventing unnecessary removal of healthy native bone while effectively replacing damaged cartilage.
4Ease of operation
If conventional hemiarthroplasty procedures are performed, then joint function is restored, but contact stresses are increased
Solution Approach 1:
The lubricious bearing surface acts as an intermediary between the implant and native cartilage, reducing direct contact stress. This intermediary layer with low friction coefficients distributes loads more evenly, allowing joint function restoration while minimizing contact stresses that could lead to further damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The implants provide reduced cartilage degeneration, preserve native bone, and enhance joint mobility by matching the natural articulation of the metatarsal head, thereby alleviating pain and improving foot function.
Implementation Method 1
a lubricious bearing surface... are designed to articulate with native cartilage, preserving bone and reducing contact stresses
Data Source
AI summary
Systems, methods, and devices described herein relate an implant adapted to be placed in a bone in the metatarsophalangeal joint or a metacarpophalangeal joint. In some embodiments, the implant includes a head portion extending from a first surface to a second surface and having a plurality of layers located between the first surface and the second surface. In some embodiments, the first surface is lubricious. In some embodiments, the implant comprises a post portion extending from the second surface of the head portion to a bone facing surface.