Patella-Referenced Bone Resection Template for Severe Bone Loss
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Solution Overview
Problem
Existing bone resection templates struggle to accurately measure resection levels in cases of severe bone loss or deformities where traditional bone features are not visible or usable as landmarks.
Innovation Solution
A bone resection template that utilizes the inferior pole of the patella as a reference guide, featuring a contoured extension arm to grasp the patella and includes indicia for determining resection levels, allowing for accurate measurements even in severe bone loss or deformities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional bone resection templates rely on distal femur or nearby bone features as landmarks, then measurement can be performed using visible bone features, but accurate measurement becomes difficult in cases of severe bone loss or deformities where bone features are not visible
Solution Approach 1:
The patent introduces the patella as an intermediary reference object when traditional bone landmarks are unavailable. The extension arm with contoured surface grasps the patella, which serves as a mediator to establish the resection level on the distal femur. This allows measurement to proceed even when the femur itself provides no visible features due to severe bone loss or deformity.
Solution Approach 2:
The template is divided into distinct functional segments: a plate body for positioning and an extension arm for patella engagement. This segmentation allows the template to independently reference different anatomical structures (femur via plate body, patella via extension arm), providing versatility for cases where one reference point may be unavailable or unreliable.
2Measurement precision
If bone resection templates are designed with contoured extension arms to grasp the patella, then accurate resection levels can be measured in severe bone loss cases, but device complexity increases
Solution Approach 1:
The template consists of a plate body and an extension arm as separate functional segments. This segmentation allows each component to be optimized for its specific purpose while maintaining overall simplicity. The extension arm can be designed with the necessary contoured surface for patella engagement without complicating the entire template structure.
Solution Approach 2:
The contoured surface is applied locally only to the extension arm where patella engagement is needed, rather than throughout the entire template. This localized application of complexity achieves the required functionality while minimizing overall device complexity. The plate body remains simple for easy positioning on the distal femur.
Data Source
AI summary
A bone resection template includes a plate body and an extension arm extending from the plate body. The plate body has a length extending from a first end to a second end opposite the first end and the extension arm protrudes from the plate body proximate the second end. The extension arm includes a portion with a curved surface contoured to receive a bone therein such that when the bone is received on the curved surface portion the plate body is on one side of the bone.