Structural and mechanical properties of tendon related to function

Area of Science:

• Biomechanics
• Connective Tissue Research
• Orthopedic Science

Background:

• Tendons are vital passive tissues for force transmission, yet their failure causes significant disability.
• The helical collagen fiber arrangement imparts complex non-linear and time-dependent mechanical properties to tendons.
• Understanding physiological loading patterns, including deformation rates and forces during locomotion, is essential for functional analysis.

Purpose of the Study:

• To highlight the importance of establishing physiological loading patterns for tendons.
• To address discrepancies between estimated and measured tendon forces.
• To emphasize the potential of direct measurement techniques for understanding tendon function and failure.

Main Methods:

• Review of existing literature on tendon mechanics and failure.
• Discussion of limitations in indirect force assessment methods.
• Advocacy for the application of demonstrated direct measurement techniques.

Main Results:

• Published maximum force estimates often fall short of quasi-static rupture strength, indicating assessment errors.
• Direct measurement techniques are practicable and can provide valuable data on tendon behavior.
• Knowledge gaps exist regarding muscle response to rapid loading and extension.

Conclusions:

• Direct measurement techniques are crucial for accurately assessing tendon forces and understanding spontaneous rupture.
• Further research is needed on muscle responses to dynamic loading.
• Despite knowledge gaps, tendon repair and treatment techniques are advancing rapidly.