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Early Achilles tendon healing in sheep
Olena Virchenko1, Anna Fahlgren, Mats Rundgren
1Orthopaedics, Department of Neuroscience and Locomotion, Faculty of Health Science, Linköping, Sweden. Olena.Virchenko@inr.liu.se
Archives of Orthopaedic and Trauma Surgery
|July 5, 2008
Summary
This study in sheep Achilles tendons shows early healing has variable mechanical properties. Growth factor CDMP-2 may improve tendon healing, highlighting the need for individualized rehabilitation programs.
Area of Science:
- Biomechanical Engineering
- Regenerative Medicine
- Veterinary Science
Background:
- Early tendon healing biomechanics are crucial for rehabilitation but lack animal models similar to humans.
- Sheep Achilles tendons were used to study early healing properties and the effect of CDMP-2.
Purpose of the Study:
- To describe the early biomechanical properties of tendon healing in a sheep model.
- To investigate the effect of growth and differentiation factor CDMP-2 on tendon healing.
Main Methods:
- Achilles tendon transection was performed on 20 female sheep.
- CDMP-2 or placebo was injected into the hematoma, followed by mechanical testing (cyclical loading, tensile tests), CT, and histology after 3 weeks.
Main Results:
- Tendon regenerates formed a sleeve, with failure occurring at the interface with tendon stumps.
- While not statistically significant, the CDMP-2 group showed trends towards larger area, force, and stiffness.
- The capacity to store elastic energy was near normal (16% hysteresis), despite low force at failure.
Conclusions:
- Results suggest a potential positive effect of CDMP-2 on tendon healing, though study power was insufficient for statistical significance.
- High variability in mechanical properties underscores the need for individualized rehabilitation programs in human tendon injuries.
- Developing appropriate energy dissipation mechanisms may be critical for preventing re-rupture.
