Tibial Tubercle Osteotomy for Minimally Invasive Knee Access
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Solution Overview
Problem
Conventional total knee arthroplasty requires long incisions and significant muscular tissue disruption, leading to prolonged recovery times and increased infection risk due to the invasive nature of the procedure.
Innovation Solution
A minimally invasive method involving a transverse incision and tibial tubercle osteotomy, using a die cutter or saw guide to elevate a portion of the tibial tuberosity, allowing access to the knee cavity with minimal bone loss and a self-locking mechanism for reinsertion, facilitating shorter recovery and reduced infection risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional total knee arthroplasty is performed with long incisions extending into muscular tissue, then adequate access to the knee joint is achieved, but recovery time is prolonged and infection risk increases
Solution Approach 1:
The procedure segments the approach to the knee joint by performing a tibial tubercle osteotomy - separating the tubercle from the tibia to create a working channel. This allows the surgeon to access the knee joint through a smaller, more controlled incision rather than making a long incision through muscular tissue, thereby reducing infection risk while maintaining adequate access.
Solution Approach 2:
The tibial tubercle acts as an intermediary structure that can be temporarily separated to provide access to the knee joint. By elevating and retracting the tubercle with its attached patellar ligament, a working channel is created without requiring extensive dissection of surrounding muscles. The tubercle is then reinserted and fixed, closing the access pathway and minimizing permanent tissue disruption.
2Ease of operation
If conventional techniques with long incisions are used, then complete access to the knee joint is obtained, but tissue disruption is increased
Solution Approach 1:
The approach segments the soft tissue disruption by creating a focused working channel through tibial tubercle osteotomy rather than making a long incision through extensive muscular tissue. This localized approach minimizes the amount of muscle that must be cut or retracted, reducing tissue disruption while still providing complete access to the knee joint for arthroplasty procedures.
Solution Approach 2:
The procedure extracts or removes a portion of the tibial tubercle to create the working channel. By taking out this specific bony structure rather than cutting through surrounding muscles, the method achieves joint access with minimal soft tissue disruption. The extracted portion can be reinserted and fixed after the procedure.
3Reliability
If a tibial tubercle osteotomy is performed to create a working channel, then minimally invasive access is achieved, but additional surgical steps and instrumentation are required
Solution Approach 1:
The surgical system employs universal, multi-functional instruments that can perform multiple tasks within the confined space of the knee joint. The reaming tool, for example, can both prepare the tibial bone surface and guide the placement of the prosthesis. This multi-functionality reduces the number of separate instruments needed, thereby reducing device complexity despite the additional osteotomy step.
Solution Approach 2:
The surgical instruments are designed with nested components that allow compact storage and efficient use of space. The guiding structure and cutting tools can be nested within each other, and the prosthetic components can be nested within the surgical instruments. This nesting reduces the overall complexity and footprint of the surgical system while enabling the minimally invasive approach.
Data Source
AI summary
A method of performing a tibial tubercle osteotomy includes cutting a bone portion of a tibial tubercle from a remaining portion of the tibial tubercle, at least a portion of a patella ligament being attached to the bone portion. The bone portion of the tibial tubercle is separated from the remaining portion of the tibial tubercle such that the patella ligament remains attached to the bone portion. After completing a surgical procedure, the separated bone portion of the tibial tubercle is reattached to the remaining portion of the tibial tubercle.