Odontoid Fracture Dynamic Compression Fixation
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Solution Overview
Problem
Conventional spinal fracture fixation methods, particularly for odontoid fractures, face challenges in providing adequate stabilization due to the complex anatomy of the cervical spine, leading to issues with rehabilitation and quality of life for patients.
Innovation Solution
An anterior plate and lag screw dynamic fixation device is applied to the second cervical vertebrae body, with a cannulated lag screw housed in a posterior shaft, allowing for compression across the fracture site through a compression screw, enhancing stabilization and bone healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spinal fracture fixation methods are used, then the procedure is simple to perform, but adequate stabilization is not provided due to complex cervical spine anatomy
Solution Approach 1:
The fixation device is divided into distinct functional segments: a plate component for anchoring to the C2 vertebral body, a shaft component extending into the odontoid process, and a compression mechanism. This segmentation allows each component to address specific anatomical challenges of the cervical spine while working together to provide reliable stabilization.
Solution Approach 2:
The compression screw is housed within the shaft of the fixation device, creating a nested structure where the compression mechanism is contained within the structural support element. This nested design consolidates multiple functions into a compact configuration that maintains reliability without proportionally increasing overall device complexity.
2Productivity
If conventional fixation methods are used, then the device structure is simple, but rehabilitation and quality of life outcomes are compromised
Solution Approach 1:
The fixation device incorporates a dynamic compression mechanism that allows for controlled adjustment of compression forces across the fracture site. This dynamic capability enables optimization of healing conditions while providing sufficient stability for early rehabilitation activities, thereby improving productivity in terms of recovery speed without requiring overly complex external adjustment mechanisms.
Solution Approach 2:
The compression screw mechanism enables adjustment of compression parameters (force magnitude) to match different stages of bone healing. By allowing parameter changes in the compression force, the device supports progressive rehabilitation while maintaining adequate stabilization, improving rehabilitation efficiency without proportionally increasing device complexity.
3Strength
If compression force is applied across the fracture site, then bone healing is promoted, but the mechanism increases device complexity
Solution Approach 1:
The compression screw mechanism is designed to be self-contained within the shaft, allowing the compression function to be activated and maintained through direct engagement with the existing structural elements. The compression screw threads directly into the shaft and contacts the plate, creating a self-service compression system that promotes bone healing without requiring external compression devices or complex actuation mechanisms.
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 solution provides effective stabilization and promotion of bone healing by applying a compressive force across the fracture site, addressing the limitations of conventional methods and improving patient rehabilitation outcomes.
Implementation Method 1
applying a compressive force from a compression screw threaded into an inferior shaft of the lag screw, wherein as a head of the compression screw contacts an inferior edge of the anterior plate, the lag screw is pulled in a caudal direction through the shaft to apply a compressive force across the odontoid fracture with the C2 body
Data Source
AI summary
A cervical fixation system and method for repairing odontoid fractures includes securing an anterior plate to caudal portion of C2 body below the odontoid neck. The anterior plate houses lag screw within a posterior shaft. A cannulated fixation device crosses the fracture site with fixation into the cephalad fragment. The lag screw can be pulled caudally into the plate with a compression screw to apply a compression force across the fracture site.