Modular Iliac Canal Prosthesis for Revision Hip Stability
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Solution Overview
Problem
Current acetabular prostheses utilizing the iliac canal for fixation lack modularity, intraoperative options, and material choices, and are not designed to address complex revision hip surgeries with substantial bone losses or poor bone quality, providing inadequate stability and orientation.
Innovation Solution
A method and device featuring a stem portion configured for securement within the iliac canal, with an acetabular component that includes a connection portion for adjustable mounting, allowing for various orientations and the use of multiple augments to enhance stability and orientation, including bone fixation elements like spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a monolithic metal Ring prosthesis is used for fixation in the iliac canal, then the device provides fixed concentric orientation, but it lacks adjustability and material options for optimal head coverage and stability
Solution Approach 1:
The prosthesis is divided into multiple independent components: a stem portion for iliac canal fixation, an acetabular component for bearing surface, and optional augment portions for bone defect reconstruction. This segmentation allows each component to be optimized independently and provides surgical flexibility in configuration and material selection.
Solution Approach 2:
The stem portion serves multiple functions: providing structural support, enabling fixation in the iliac canal, and serving as an anchor for the acetabular component. The modular design allows the same stem to accommodate different acetabular components and augments, making the system universally applicable to various clinical scenarios including primary and revision hip surgeries.
2Stability of the object's composition
If an eccentric frustoconical prosthesis is used with wedge press-fit, then rotational stability is achieved, but it requires accurate reaming and does not provide concentric screwing into the iliac canal
Solution Approach 1:
The system transitions from a fixed eccentric design to a dynamic modular configuration where the acetabular component can be positioned and oriented relative to the stem portion. This allows the surgeon to achieve optimal head coverage and stability through adjustable positioning rather than relying on fixed geometric constraints that require precise pre-reaming.
3Reliability
If prior art augments are used to fill bone voids, then acetabular cup stability is improved, but they lack protrusion portions for insertion into the IM canal and means for mounting to the canal
Solution Approach 1:
The augment portions are integrated with the stem portion to form a unified fixation system. The combined structure allows simultaneous achievement of iliac canal anchoring and acetabular bone void reconstruction, eliminating the need for separate mounting procedures and improving overall system reliability.
4Adaptability or versatility
If conventional acetabular prostheses are used in revision hip surgery, then they are not designed for substantial bone losses or poor bone quality, but they provide inadequate stability and orientation in compromised bone structures
Solution Approach 1:
The prosthesis allows different portions to be made from different materials optimized for their specific functions: the stem portion may use materials optimized for iliac canal fixation, while the acetabular component and augments can use materials optimized for bone integration and load bearing. This local optimization enhances reliability in compromised bone structures.
Data Source
AI summary
An acetabular prosthetic device for implantation in an iliac canal and acetabulum of an ilium comprises a stem and an acetabular component. The stem may be configured to be implanted in the iliac canal. The acetabular component may be configured to be implanted in the acetabulum and fixed to the stem. The acetabular component may further comprise a connection portion to adjustably connect the acetabular component to the stem such that the acetabular component is configured to be oriented in a plurality of orientations before being fixed to the stem.