Half-segmental Diaphyseal Bone Defect Model in Rats for Evaluating Bone Substitute Performance in Load-bearing Regions

作者： Shuhan Liu1,2, Peng Yu1, Jialu Jin1,2, Yuchuan Luo1,2, Yiyun Chen1,2, Feifei Li1, Yitian Wang1, Ling Ye1,2, Jiayi Wu1,3 1State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology,Sichuan University, 2Department of Cariology and Endodontics, West China Hospital of Stomatology,Sichuan University, 3Department of Jinjiang Outpatient, West China Hospital of Stomatology,Sichuan University

简介：

Overview

This study established a rat femoral half-segmental defect model to evaluate the mechanical and osteogenic performance of bone substitute materials under load-bearing conditions without the use of internal or external fixation. The protocol enables in vivo mechanical evaluation of implants, providing a reproducible model for realistic assessments.

Key Study Components

Area of Science

• Neuroscience
• Bone Regeneration
• Mechanical Testing

Background

• Standardized load-bearing defect models are lacking for in vivo assessments.
• Existing models often require fixation, complicating mechanical evaluations.
• Bone substitute materials need thorough evaluation for clinical applications.
• Understanding osteogenic performance is crucial for developing effective implants.

Purpose of Study

• To establish a reproducible femoral defect model in rats.
• To evaluate the mechanical and osteogenic performance of load-bearing bone materials.
• To assess the effectiveness of different bone substitute materials.

Methods Used

• Creation of a femoral half-segmental defect in anesthetized rats.
• Use of 3D printed Poly Methyl Methacrylate (PMMA) implants for testing.
• Micro computed tomography for imaging bone regeneration.
• Hematoxylin and Eosin staining for histological analysis.

Main Results

• PMMA implants showed restored morphology and minimal ectopic ossification.
• Gelatin methacryloyl hydrogel exhibited extensive fibrous tissue and ectopic bone.
• Higher counts of Piezo 1 and LepR positive cells were found in the PMMA group.
• Quantitative analysis confirmed significant differences between groups.

Conclusions

• The established model allows for effective mechanical evaluation of bone substitutes.
• PMMA implants demonstrated superior osteogenic performance compared to gelatin methacryloyl.
• This study contributes to the development of better bone regeneration strategies.

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