Assembled Osteochondral Graft via Hydration-Controlled Interference Fit
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Solution Overview
Problem
Current treatments for focal articular cartilage defects in the knee, such as those caused by injuries, have limitations including quality of repair, cost, and complexity, with existing procedures often creating additional defects or requiring extensive recovery time, and lack effective solutions for defects larger than 2.5 cm2.
Innovation Solution
A bifunctional bioabsorbable assembled implant that promotes the growth of both cartilage and bone at a single site, comprising an osteoconductive portion for subchondral bone and a chondroinductive portion for cartilage, assembled via a hydration-controlled interference fit, eliminating the need for additional fasteners or adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional procedures (debridement, marrow stimulation, autograft osteochondral plugs) are used for focal cartilage defects, then some level of repair is achieved, but the quality of cartilage repair is limited and procedures create additional defects
Solution Approach 1:
The implant combines osteoconductive cancellous bone material and chondroinductive demineralized cortical bone material into a single composite structure, allowing simultaneous promotion of bone and cartilage tissue growth without the need for separate procedures that could create additional defects
Solution Approach 2:
The implant is divided into distinct osteoconductive and chondroinductive portions, each optimized for its specific function, allowing targeted tissue regeneration while maintaining a single implant structure that avoids multiple surgical interventions
2Adaptability or versatility
If allograft osteochondral plugs or autologous cultured chondrocytes are used for defects greater than 2.5 cm2, then repair options are available, but cost and surgical complexity increase significantly
Solution Approach 1:
The implant serves multiple functions within a single device: it provides structural support, promotes bone ingrowth through osteoconductive properties, and stimulates cartilage formation through chondroinductive properties, eliminating the need for complex multi-stage procedures
Solution Approach 2:
The implant is pre-assembled with both osteoconductive and chondroinductive portions in the correct configuration before surgery, allowing for a single-stage implantation procedure rather than requiring complex intraoperative assembly or multiple surgical stages
3Reliability
If autograft osteochondral plugs are used, then cartilage tissue can be recovered and implanted, but second site morbidity occurs at the harvest site
Solution Approach 1:
The implant uses allograft bone materials that inherently possess osteoconductive and chondroinductive properties, eliminating the need to harvest autograft tissue from the patient's own body and thereby avoiding second site morbidity while still providing effective tissue regeneration
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 implant provides a solid and secure assembly that supports tissue ingrowth and healing, reducing recovery time and costs, while effectively addressing defects of various sizes without causing further damage, thereby enhancing the quality of cartilage repair.
Implementation Method 1
assembled via a hydration controlled interference fit
Data Source
AI summary
Bifunctional and assembled implants are provided for osteochondral implantation.