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Related Experiment Video

Updated: Nov 18, 2025

Murine Flexor Tendon Injury and Repair Surgery
07:32

Murine Flexor Tendon Injury and Repair Surgery

Published on: September 19, 2016

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Proceed with Caution: Mouse Deep Digit Flexor Tendon Injury Model.

Ashley L Titan1,2, Evan Fahy2, Kellen Chen2

  • 1Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Palo Alto, Calif.

Plastic and Reconstructive Surgery. Global Open
|February 8, 2021
PubMed
Summary
This summary is machine-generated.

Mouse models present challenges for flexor tendon repair research due to anatomical differences, particularly in the synovial sheath and vascular supply. These limitations make them unreliable for assessing tendon injury and repair in humans.

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Area of Science:

  • Orthopedics
  • Biomedical Engineering
  • Comparative Anatomy

Background:

  • Flexor tendon repair and reconstruction are critical in orthopedic surgery.
  • Mouse models are frequently used in preclinical research due to genetic tractability and cost-effectiveness.
  • Assessing the suitability of mouse models for human conditions is essential for translational research.

Purpose of the Study:

  • To evaluate the feasibility of using mouse models for translational studies of flexor tendon repair.
  • To compare the anatomical and biomechanical properties of the mouse deep digit flexor tendon (DDF) with human tendons.

Main Methods:

  • Quantitative analysis of mouse hindpaw DDF gross anatomy, histology, and biomechanical properties.
  • Histological characterization of the DDF and surrounding digital anatomy.
  • Biomechanical testing including load-to-failure, stress, and elastic modulus determination.

Main Results:

  • Mouse DDF origins, insertions, and synovial sheath anatomy show similarities to humans, but with a thinner sheath and limited vascular penetration.
  • The mouse DDF dimensions (0.14 ± 0.03 mm thickness, 0.3 ± 0.03 mm width) are smaller than a 9-0 nylon needle.
  • Mean failure force of the mouse DDF was 2.79 ± 0.53 N.

Conclusions:

  • While mouse hindpaw DDF shares some anatomical similarities with human digits, critical differences in the synovial sheath and vascularization exist.
  • The small dimensions of the mouse DDF pose significant challenges for creating clinically relevant surgical repair models.
  • Mice are deemed an unreliable model for evaluating flexor tendon injury and repair outcomes due to these anatomical and technical limitations.