MTP Joint Orthopedic Plate with Multiplanar Fixation
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Solution Overview
Problem
Current surgical procedures for stabilizing the first metatarsophalangeal joint, such as fusion or bunion correction, often result in loss of motion and require invasive methods like bone removal or arthrodesis, which do not adequately address the instability and deformity issues at the joint.
Innovation Solution
A custom-designed orthopedic plate with bilateral mirror symmetry and multiplanar compressive fixation capabilities, featuring a central slot for compression and locking screw holes, which can be pre-bent for individual anatomy and includes a radiographic opening for bone grafting, providing stable fixation without complete loss of joint motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fusion or arthrodesis is performed to stabilize the MTP joint, then joint stability is improved, but complete loss of joint motion occurs
Solution Approach 1:
The plate is divided into distinct functional zones: a first engagement portion for the metatarsal bone, a second engagement portion for the phalanx bone, and a central body portion. This segmentation allows independent optimization of each zone for its specific function while maintaining overall structural integrity and joint stability.
Solution Approach 2:
The plate utilizes multiplanar screw hole arrangements in both engagement portions, allowing screws to be positioned in multiple planes and orientations. This dimensional approach enables compression forces to be applied from multiple angles, achieving stable fixation while preserving the ability to maintain joint alignment and motion.
2Shape
If bone removal or invasive methods are used to correct deformity, then deformity correction is improved, but tissue damage and invasiveness increase
Solution Approach 1:
The plate incorporates pre-defined angular parameters including a valgus angle (5-25 degrees) and dorsiflexion angle (0-10 degrees) in its geometry. These parameter changes allow the plate to mechanically correct deformities through its structural design rather than requiring aggressive bone removal, thereby reducing tissue damage while achieving proper alignment.
Solution Approach 2:
The plate serves as an intermediary device that provides mechanical leverage and force distribution to gradually correct deformities. By using the plate as a mediator with built-in angular corrections, the system achieves deformity correction through controlled mechanical forces rather than direct bone removal, minimizing harmful effects to surrounding tissues.
3Strength
If custom plate design with multiplanar fixation is used, then fixation strength is improved, but device complexity increases
Solution Approach 1:
The plate is designed as a universal device that combines multiple functions: it provides structural support, enables multiplanar compression fixation, incorporates deformity correction angles, and allows bone graft insertion through a central opening. This multi-functionality achieves strong fixation without requiring multiple separate surgical devices, thereby managing complexity while maintaining strength.
Solution Approach 2:
The plate features asymmetric design elements including offset screw holes in the first and second engagement portions, and non-uniform thickness distribution. This asymmetry is strategically positioned to optimize fixation strength in specific directions while maintaining overall structural efficiency, achieving strong fixation without unnecessary complexity throughout the entire structure.
4Stability of the object's composition
If compression fixation is applied to stabilize the joint, then bone fusion stability is improved, but bone grafting access is restricted
Solution Approach 1:
The plate body is segmented to include a central opening that separates the compression function (applied through the plate structure) from the grafting function (accessed through the central opening). This segmentation allows compression forces to be applied to the bone interfaces while simultaneously providing open access for bone graft insertion and packing, resolving the conflict between stability and accessibility.
Data Source
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AI summary
The present invention is a MTP plate that has a first embodiment with a profile having bilateral mirror symmetry of the about a transverse plane with an angle of about 5 for dorsiflexion and an angle of about 10 for valgus. Both ends of the plate include a central arm having a slot for compression and two offset arms having offset ears with locking screw holes that provide for multiplanar compressive fixation. The bone contacting surface of the plate is radiused to allow the plate to be in snug contact with the bone. In a second embodiment of the plate for revision surgery, the proximal end of the plate includes a metatarsal extension and the plate has a central locking hole for securing bone graft.