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A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats
Published on: May 20, 2019
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Development of a novel knee contracture mouse model by immobilization using external fixation
Kotaro Tokuda1, Yoshiaki Yamanaka1, Kenji Kosugi1
1Department of Orthopaedic Surgery, University of Occupational and Environmental Health, Fukuoka, Japan.
Connective Tissue Research
|February 19, 2021
Summary
This study introduces a new mouse model for knee joint contracture using external fixation. Immobilized knees showed reduced range of motion and increased joint capsule fibrosis, indicating a useful model for studying joint contracture.
Area of Science:
- Orthopedics
- Musculoskeletal Research
- Animal Modeling
Background:
- Knee joint contracture is a debilitating condition.
- Animal models are crucial for studying contracture pathogenesis and therapeutics.
- Existing mouse models for knee contracture lack detailed construction protocols.
Purpose of the Study:
- To develop and validate a novel knee joint contracture mouse model using external fixation.
- To investigate the feasibility of using genetically modified mice for contracture research.
- To establish a cost-effective model for evaluating therapeutic interventions.
Main Methods:
- Immobilization of mouse knee joints using external fixation (splint and tape).
- Assessment of passive extension range of motion (ROM) at 2 and 4 weeks.
- Histological and immunohistochemical analysis of joint capsule changes.
- Quantification of fibrosis-related gene and protein expression.
Main Results:
- Significantly reduced extension ROM in immobilized knees at 4 weeks (p < 0.01).
- Increased joint capsule thickness and area in immobilized knees at 2 and 4 weeks (p < 0.01).
- Elevated mRNA levels of fibrosis-related genes (excluding TGF-β1) and protein levels of CCN2 and vimentin at 2 weeks (p < 0.01).
Conclusions:
- The developed external fixation mouse model effectively induces knee joint contracture.
- This model provides a valuable platform for investigating the etiology of joint contracture.
- It serves as a robust tool for establishing and testing novel treatment strategies.
