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Fascicular Elastin Modulates Recovery of Mechanical Properties Following Subfailure Repetitive Loading.

Shawn N Pavey^1,2, Nathan Xu^3,2, Spencer P Lake^4,2

¹Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130.

Journal of Biomechanical Engineering

|May 29, 2026

Summary

Elastin deficiency impairs tendon mechanical properties after sub-failure fatigue loading, suggesting slower recovery and potential for increased damage accumulation in individuals with depleted elastin.

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Area of Science:

Biomedical Engineering
Musculoskeletal Science
Tendon Biomechanics

Background:

Fascicular elastic fibers significantly influence tendon mechanical properties.
The role of elastin in tendon fatigue properties is an emerging area of research.

Purpose of the Study:

To investigate the effects of sub-failure cyclic fatigue loading on tendon mechanical properties in wild-type and elastin-deficient mice.
To compare tendon damage and mechanical recovery following fatigue loading in the presence and absence of sufficient elastin.

Main Methods:

Achilles (AT) and tibialis anterior (TB) tendons from wild-type and elastin knockdown mice were subjected to 50% of cyclic fatigue.
Following fatigue, tendons underwent stress relaxation and ramp to failure testing.
Quantitative metrics of collagen denaturation and fiber kinking were assessed.

Main Results:

Sub-failure fatigue loading decreased ultimate stress and linear modulus, particularly in elastin-deficient tendons.
Elastin deficiency led to genotype-dependent differences in stress relaxation properties.
Damage metrics (collagen denaturation, fiber kinking) were not different between genotypes at 50% fatigue, suggesting damage accrues later in the fatigue cycle.
Elastin's role in collagen fiber alignment differs between AT and TB tendons.

Conclusions:

Elastin is crucial for maintaining tendon mechanical integrity and recovery following repetitive loading.
Elastin deficiency may lead to impaired recovery and increased susceptibility to damage accumulation.
Tendon-specific microstructural mechanisms mediate elastin's effects on mechanical properties.