Knee-Arthroplasty-RAG: An Orthopedic Clinical Decision-Making RAG System Based on MedGemma-27B

Knee-Arthroplasty-RAG is a Retrieval-Augmented Generation (RAG) system specifically designed for knee arthroplasty surgery. Built on the MedGemma-27B medical large language model, it aims to provide reliable clinical decision support for orthopedic surgeons and has been evaluated against ordinary LLM reasoning to address the pain points of time-consuming, labor-intensive, and experience-limited clinical decision-making.

Knee arthroplasty is an effective treatment for severe knee joint diseases, but its success involves complex decision-making across multiple stages, including pre-operative assessment, prosthetic selection, surgical plan formulation, and post-operative rehabilitation. Doctors need to integrate multiple factors such as patient age, weight, and bone condition, and refer to a large number of clinical guidelines and cases. This process is time-consuming and easily limited by personal experience, which is the core pain point addressed by this project.

The technical architecture of Knee-Arthroplasty-RAG includes:

1. Medical Knowledge Base Construction: Integrating structured content related to knee arthroplasty, such as clinical guidelines, surgical literature, complication management plans, and prosthetic information;
2. MedGemma-27B Base Model: A model optimized by Google for medical scenarios, with better performance in medical term understanding and clinical reasoning;
3. Intelligent Retrieval Module: A semantic retrieval strategy designed for the professionalism of medical texts;
4. Generation and Integration Module: Combining retrieved documents with queries and inputting them into the model to generate traceable structured answers.

The project evaluated the RAG system against ordinary LLMs across the following dimensions:

• Accuracy: RAG cites authoritative literature, leading to higher accuracy on factual questions;
• Hallucination Rate: RAG anchors on real documents, effectively reducing the risk of hallucinations;
• Interpretability: Answers come with sources, making it easy for doctors to verify;
• Coverage: May be limited for new knowledge or rare cases, requiring continuous updates to the knowledge base.

The clinical application value of the system is reflected in:

• Pre-operative Planning: Providing personalized assessment points and surgical strategy recommendations;
• Prosthetic Selection: Retrieving prosthetic comparison studies and follow-up data to assist decision-making;
• Complication Management: Offering identification and management recommendations based on the latest literature;
• Medical Education: Serving as an interactive learning tool to help medical students understand surgical knowledge.

The system design must consider:

• Decision Support, Not Replacement: The final decision is made by the doctor;
• Knowledge Base Quality Control: Regular updates to include the latest evidence;
• Responsibility Attribution: Clear mechanisms for defining responsibility in case of disputes;
• Bias and Fairness: Auditing population biases in the data;
• Privacy Protection: Compliance with regulations such as HIPAA and GDPR.

RAG technology can be extended to specialized fields such as cardiovascular diseases, oncology, emergency medicine, and drug consultation. Current challenges include:

• Multi-modal Data Fusion: Integrating heterogeneous data such as images and test results;
• Balance Between Personalization and Generality: Considering both guidelines and individual differences;
• Trade-off Between Real-time Performance and Accuracy: Optimizing response speed and quality;
• Continuous Learning: Timely integration of new medical knowledge.

Knee-Arthroplasty-RAG represents an important direction of AI in the medical field. By combining RAG technology with a professional knowledge base, it balances the capabilities of large models and safety requirements. With the maturity of technology and improvement of regulations, we look forward to more specialized medical AI systems being put into application to benefit patients and medical workers.