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Related Experiment Video

Updated: May 26, 2026

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats
05:34

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats

Published on: May 20, 2019

A Novel Surgical Approach to Induce an Ankle Joint Contracture in Rats.

Guido Geusebroek1, Jaap van Dieën1, Wendy Noort1

  • 1Department of Human Movement Sciences, Faculty of Behavioral and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, The Netherlands.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|May 25, 2026
PubMed
Summary

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Researchers developed a new surgical method to create persistent ankle plantar-flexion contractures in rats. This model shows lasting muscle atrophy and joint stiffness, offering a platform for studying interventions.

Area of Science:

  • Biomechanical Engineering
  • Surgical Innovation
  • Animal Models

Background:

  • Joint contractures, such as ankle plantar-flexion contracture, significantly impair mobility.
  • Existing animal models often lack the ability to replicate persistent, surgically induced contractures for studying long-term effects.
  • A reliable model is needed to investigate the biomechanical and morphological changes associated with contractures and to test therapeutic interventions.

Purpose of the Study:

  • To establish and validate a novel surgical technique for inducing persistent ankle plantar-flexion contracture in Wistar rats.
  • To characterize the biomechanical and morphological changes resulting from this induced contracture.
  • To assess the persistence of these changes after immobilization release, providing a model for intervention studies.
Keywords:
anklebiomechanicscontracturejointmusclerat model

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Related Experiment Videos

Last Updated: May 26, 2026

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats
05:34

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats

Published on: May 20, 2019

Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat
04:59

Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat

Published on: November 9, 2018

A Mouse Model of Ankle-Subtalar Complex Joint Instability
09:14

A Mouse Model of Ankle-Subtalar Complex Joint Instability

Published on: October 28, 2022

Main Methods:

  • A surgical approach using a stainless steel suture to immobilize the ankle in a plantar-flexed position in Wistar rats.
  • Immobilization was maintained for 4 weeks, followed by suture release.
  • Biomechanical assessments (torque, stiffness) and morphological analyses (muscle mass, tendon length) were performed at baseline, post-immobilization, and post-release.

Main Results:

  • The surgical method successfully induced ankle plantar-flexion contracture, characterized by a significant shift in ankle angle and increased torque and stiffness.
  • Medial gastrocnemius muscle atrophy (34% mass reduction) was observed after 4 weeks of immobilization.
  • These biomechanical deficits and muscle atrophy persisted for at least 4 weeks after immobilization release, with no signs of recovery.

Conclusions:

  • The novel surgical immobilization technique effectively creates a persistent ankle plantar-flexion contracture model in Wistar rats.
  • This model demonstrates lasting biomechanical alterations and muscle atrophy, making it suitable for evaluating therapeutic interventions.
  • The model provides a valuable tool for understanding the long-term consequences of joint contractures and developing effective treatments.