Second and Third Metatarsal Wedge Osteotomy for Foot Realignment
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Solution Overview
Problem
Metatarsus adductus and hallux valgus deformities in the foot, characterized by medial deviation of metatarsals and lateral deviation of the hallux, often require surgical intervention to realign bones and improve patient comfort and mobility, but existing methods are limited in effectiveness and precision.
Innovation Solution
A surgical technique involving access to the second and third tarsometatarsal joints for bone preparation and realignment, using cutting guides and templates to create wedge-shaped openings, allowing metatarsals to be rotated and realigned in various planes, with or without preserving ligaments, and fixed in place to correct angular misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional surgical methods are used to realign metatarsals, then surgical intervention can be performed, but precision and effectiveness are limited
Solution Approach 1:
The patent applies preliminary action by pre-planning the osteotomy cut lines and angles based on desired postoperative alignment. Templates are fabricated beforehand with pre-calculated cut parameters, allowing the surgeon to execute precise realignment without intraoperative calculation errors. The templates incorporate pre-determined wedge angles and cut orientations that will achieve the target metatarsal alignment.
Solution Approach 2:
The patent uses templates as intermediary devices that transfer the planned alignment geometry to the actual bone cuts. These templates act as mediators between the surgical plan and execution, ensuring that the osteotomy cuts are made at precisely the intended angles and positions. The templates include guide features that directly guide cutting instruments along predetermined paths.
2Manufacturing precision
If bone wedges are removed to create gaps for realignment, then metatarsals can be rotated to correct deformity, but connective tissue may be damaged
Solution Approach 1:
The patent applies local quality by making targeted bone cuts only where needed to create the necessary realignment, while preserving surrounding connective tissue structures. The osteotomy cuts are localized to specific regions of the metatarsal bases, allowing rotation and realignment without requiring widespread soft tissue disruption. The wedge removal is precisely confined to the bone itself, sparing adjacent ligaments and capsules.
Solution Approach 2:
The patent segments the correction process into discrete steps: first creating controlled osteotomy cuts, then removing precise bone wedges to create gaps, then rotating the metatarsal segments to achieve alignment, and finally fixing the corrected position. This segmentation allows each step to be performed with minimal soft tissue disturbance, preserving connective tissue integrity while achieving the desired realignment.
3Measurement precision
If multiple metatarsals are realigned independently, then individual angular misalignment can be corrected, but surgical complexity increases
Solution Approach 1:
The patent applies universality by designing templates that can be used for realigning multiple metatarsals (second, third, and fourth) using the same fundamental approach and instrumentation. Each metatarsal receives a customized template, but all templates follow the same design principles and are applied through the same surgical technique. This universal methodology reduces procedural complexity compared to treating each metatarsal with a completely different approach.
Solution Approach 2:
The patent applies local quality by customizing each template to the specific anatomical and deformity characteristics of each metatarsal being treated. Each template incorporates locally optimized cut parameters, wedge angles, and alignment targets tailored to that specific bone's deformity. This localized customization allows precise correction of each metatarsal's unique angular misalignment while maintaining a consistent overall surgical workflow.
Data Source
AI summary
A metatarsus adductus technique may involve cutting an end of one or both of a second metatarsal and an intermediate cuneiform to create a wedge-shaped opening between the end of the second metatarsal and the intermediate cuneiform. The method may further involve cutting an end of one or both of a third metatarsal and a lateral cuneiform to also create a wedge-shaped opening between the end of the third metatarsal and the lateral cuneiform. The second metatarsal and the third metatarsal can then be moved in a transverse plane to close a metatarsus adductus angle. Movement of the second and third metatarsal may close the wedge-shaped openings forming during bone cutting. With the second and third metatarsals appropriately realigned, the clinician can fixate the moved position of the second metatarsal and the third metatarsal.