MTP Joint Fusion Device With Bone Ingrowth Matrix
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Solution Overview
Problem
Traditional methods for metatarsophalangeal (MTP) joint fusion, such as those used for severe hallux rigidus or bunions, often result in shortening of the first ray, inadequate bony ingrowth, and irritation from hardware, particularly when revising failed fusions or implants, due to the use of plates which can lead to premature failure and bulkiness.
Innovation Solution
A stand-alone MTP joint fusion device that includes an MTP head replacement component with a bone ingrowth matrix and an intramedullary screw, secured by radially positioned screws, eliminating the need for a fusion plate and allowing for anatomically correct positioning of the hallux, promoting secure fusion and bone growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a neutralization plate is used for MTP joint fusion, then the fusion stability is improved, but the device complexity and soft tissue bulk increase causing patient irritation
Solution Approach 1:
The patent removes the neutralization plate component from the traditional fusion construct, extracting only the essential fixation elements (head replacement component and intramedullary screw) needed to achieve stable fusion while eliminating the source of soft tissue irritation and device complexity
Solution Approach 2:
The patent combines the head replacement component and intramedullary screw into an integrated stand-alone fusion device that provides both structural support and fixation functions previously separated between multiple components including the plate
2Reliability
If bone is resected to create a healing environment, then the fusion potential is improved, but the first ray length is shortened
Solution Approach 1:
The patent changes the state of the bone interface by using an intramedullary screw that compresses and stabilizes the bone surfaces, creating optimal conditions for healing without requiring extensive bone resection, thereby preserving first ray length while maintaining fusion potential
3Length of moving object
If a block bone graft is used to restore length, then the anatomic length is improved, but the bony ingrowth capability is reduced due to inadequate lattice structure
Solution Approach 1:
The patent employs a head replacement component with a porous or lattice-like internal structure that provides both the necessary length restoration and an ideal framework for bony ingrowth, eliminating the need for separate bone grafting procedures
4Ease of operation
If the hallux is positioned in an anatomically functional position, then the gait function is improved, but the positioning precision becomes more difficult to achieve with traditional plates
Solution Approach 1:
The head replacement component is pre-configured with built-in positioning features and geometry that guide the hallux into the correct anatomical position before final fixation, eliminating the need for complex intraoperative positioning adjustments and ensuring precise alignment
Data Source
AI summary
An MTP joint fusion device is disclosed which stabilizes the fusion site without the use of a fusion plate. Further, the MTP joint fusion device comprises an MTP head replacement component placed over the distal end of the first metatarsal. This portion of the device contains the bone ingrowth matrix. An intramedullary screw is driven through the distal central portion of the device into the base of the proximal phalanx of the hallux. At least two metatarsal screws are driven radially through the device into the metatarsal neck area. This secures the MTP head replacement component to the metatarsal at a specifically determined angle. Thus, the MTP joint fusion device provides for a more secure fusion environment, increased capacity for bone ingrowth, less potential for irritation from retained hardware, and earlier weight bearing as compared to traditional methods.