Related Experiment Video
Updated: Jan 13, 2026
Osteoarthritis Pain Model Induced by Intra-Articular Injection of Mono-Iodoacetate in Rats
Published on: May 20, 2020
Intra-Articular Injection in Wistar Rats: Standardization and Experimental Validation of a Precise Protocol for
Manuel Flores-Sáenz1, Belén Chico2, Maria C García Alonso2
1University of Alcalá, Department of Surgery, Medical and Social Sciences, Teaching Unit of Human Anatomy and Embryology, Laboratory of Osseointegration and Microscopic Anatomy, Science and Technology Campus, Madrid-Barcelona Highway, Km. 33.600, 28805 Alcalá de Henares, Madrid, Spain.
This study presents a precise intra-articular knee injection protocol for rats. The validated method ensures accurate nanomaterial delivery and enhances reproducibility in preclinical research.
Area of Science:
- Biomedical Engineering
- Preclinical Research Methodology
- Nanotoxicology
Background:
- Intra-articular injection is crucial for preclinical studies but lacks standardized protocols, impacting reproducibility.
- Current methods for rodent joint injections are not consistently validated, limiting translational validity.
- Developing precise injection techniques is essential for accurate therapeutic evaluation and disease modeling.
Purpose of the Study:
- To establish and validate a refined protocol for precise intra-articular knee injections in Wistar rats.
- To ensure accurate delivery of nanomaterials for preclinical research and disease modeling.
- To improve the reproducibility and ethical standards of rodent intra-articular injection techniques.
Main Methods:
- A detailed protocol specifying anatomical landmarks, instrumentation (27 G needle, 100 µL Hamilton syringe), and a 35 µL maximum volume was developed.
- Operative success was verified using tactile feedback during injection.
- Experimental validation involved injecting graphene oxide-hyaluronic acid (GO-HA) functionalized CoCr wear particles into rat knees.
Main Results:
- Histological analysis confirmed exclusive intra-articular particle localization in 100% of injected rats (5/5).
- Particles were widely distributed within the synovial space, with no observed extravasation.
- The protocol demonstrated high intra-operator repeatability.
Conclusions:
- The refined protocol offers a reliable method for precise intra-articular administration of nanomaterials in rats.
- This validated technique enhances the generation of robust joint disease models for preclinical research.
- The protocol improves reproducibility and animal welfare in rodent-based biomedical studies.
