TPLO Plate Offset Hole Geometry for Dual Osteotomy Compression
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Solution Overview
Problem
In TPLO procedures, improper seating or insufficient compression of the cut portion of the tibia can lead to improper healing, as TPLO plates are not effectively securing the rotated tibial segment to the lower portion, leading to bone failure.
Innovation Solution
A TPLO plate with specific hole configurations, including elongated and offset portions, allows for both cranial and distal compressions through bone fixation elements, ensuring proper seating and alignment of the osteotomy cut segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional TPLO plate with standard hole configuration is used, then the plate can be easily manufactured and installed, but it cannot provide sufficient cranial and distal compression to ensure proper seating of the osteotomy cut
Solution Approach 1:
The hole configuration is segmented into distinct functional portions: an elongated portion for distal compression and an offset portion for cranial compression. This segmentation allows each portion to independently perform its specific compression function, ensuring both cranial and distal compression are achieved without requiring overly complex overall design
Solution Approach 2:
The hole configuration transitions from a simple linear alignment to a two-dimensional offset arrangement. The offset portion extends at an angle relative to the longitudinal axis, creating a geometric transformation that enables cranial compression vector while maintaining compatibility with standard bone fixation elements
2Reliability
If the cut portion of the tibia is not properly seated or sufficiently compressed, then the TPLO procedure is simpler to perform, but the bone fails to heal properly
Solution Approach 1:
The hole configuration parameters (offset distance, angle relative to longitudinal axis, elongation dimension) are specifically designed to transform the force vector applied by standard bone fixation elements. This parameter optimization ensures that routine insertion of fixation elements automatically produces the desired cranial and distal compression without requiring complex surgical maneuvers
Solution Approach 2:
The offset hole configuration acts as an intermediary mechanism that translates the simple insertion action of bone fixation elements into complex compression movements. The geometric design of the holes mediates between the straightforward surgical action and the required complex compression outcome, making the procedure easier while ensuring proper healing
3Reliability
If the TPLO plate uses a complex hole configuration for dual compression, then proper compression is achieved, but the manufacturing and installation become more difficult
Solution Approach 1:
The hole configuration is segmented into standard drillable portions (elongated portion along longitudinal axis) and offset portions at specific angles. Each segment can be manufactured using standard drilling and machining operations, avoiding the need for complex multi-axis machining while still achieving the desired geometric configuration for dual compression
Data Source
AI summary
TPLO plate includes a body and first and second distal holes. The body extends longitudinally from a proximal end to a distal end and defined via a first surface which, in an operative configuration, faces away from a bone and a second surface which, in the operative configuration, faces toward the bone. The body includes a proximal portion configured to be positioned over a cut and repositioned proximal segment of a tibia during a procedure and a distal portion extending along a longitudinal axis and configured to be positioned over a distal segment of the tibia during the procedure. The first hole extends through a proximal end of the distal portion of the body from the first surface to the second surface. The first hole includes an elongated portion and an offset portion open to and in communication with one another. The elongated portion extends along the longitudinal axis and an offset portion extending distally from the elongated portion along an offset axis, which extends at an angle relative to the longitudinal axis. The second hole extends through the distal portion of the body distally of the first hole from the first surface to the second surface. The second hole extends along the longitudinal axis in alignment with the elongated portion of the first hole and including a sloped compression surface along a distal portion thereof. The first hole is configured such that when a first distal compression to the osteotomy cut is applied via insertion of a bone fixation element into a distal portion of the second hole. The element translates along the offset axis from a central axis to a point of intersection to provide a cranial compression to the osteotomy cut.