Fascicles and the interfascicular matrix show adaptation for fatigue resistance in energy storing tendons.
Abstract: Tendon is composed of rope-like fascicles, bound together by interfascicular matrix (IFM). Our previous work shows that the IFM is critical for tendon function, facilitating sliding between fascicles to allow tendons to stretch. This function is particularly important in energy storing tendons, which experience extremely high strains during exercise, and therefore require the capacity for considerable inter-fascicular sliding and recoil. This capacity is not required in positional tendons. Whilst we have previously described the quasi-static properties of the IFM, the fatigue resistance of the IFM in functionally distinct tendons remains unknown. We therefore tested the hypothesis that fascicles and IFM in the energy storing equine superficial digital flexor tendon (SDFT) are more fatigue resistant than those in the positional common digital extensor tendon (CDET). Fascicles and IFM from both tendon types were subjected to cyclic fatigue testing until failure, and mechanical properties were calculated. The results demonstrated that both fascicles and IFM from the energy storing SDFT were able to resist a greater number of cycles before failure than those from the positional CDET. Further, SDFT fascicles and IFM exhibited less hysteresis over the course of testing than their counterparts in the CDET. This is the first study to assess the fatigue resistance of the IFM, demonstrating that IFM has a functional role within tendon and contributes significantly to tendon mechanical properties. These data provide important advances into fully characterising tendon structure-function relationships. Understanding tendon-structure function relationships is crucial for the development of effective preventative measures and treatments for tendon injury. In this study, we demonstrate for the first time that the interfascicular matrix is able to withstand a high degree of cyclic loading, and is specialised for improved fatigue resistance in energy storing tendons. These findings highlight the importance of the interfascicular matrix in the function of energy storing tendons, and potentially provide new avenues for the development of treatments for tendon injury which specifically target the interfascicular matrix.
Copyright © 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Publication Date: 2016-06-07 PubMed ID: 27286677PubMed Central: PMC5015572DOI: 10.1016/j.actbio.2016.06.012Google Scholar: Lookup
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Summary
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This study investigates the fatigue resistance of structures within tendons, specifically fascicles and the interfascicular matrix (IFM). The analysis reveals that these structures within energy storing tendons demonstrate greater fatigue resistance and are better equipped to handle high-strain activities as compared to positional tendons.
Research Overview
- The study moves forward from where previous works left off, exploring the dynamic properties of the interfascicular matrix (IFM) in tendons, a component that is of central use in facilitating the stretchability and flexibility of tendons.
- Energy storing tendons, principally due to their function, experience high degrees of strain, needing substantial flexibility to absorb and release energy.
- The study hypothesises that these tendons, in response to their role, have developed increased fatigue resistance in their fascicular and IFM structures as compared to positional tendons which perform relatively static functions.
Methodology
- The investigation involved fatigue testing fascicles and the IFM from two distinct types of tendons – the superficial digital flexor tendon (SDFT, an energy-storing tendon) and the common digital extensor tendon (CDET, a positional tendon).
- Both structures were subjected to cyclic fatigue testing until failure, and their mechanical properties were measured and assessed.
Results and Interpretation
- The results of the testing highlighted the differential resistance of the two types of tendons to fatigue. Both fascicles and the IFM from SDFT demonstrated a higher ability to resist fatigue as compared to their counterparts within the CDET.
- The SDFT also exhibited less hysteresis during testing, which suggests a better stress-strain performance when subjected to a constant degree of force.
- This provides valuable insights into the functional role of the IFM, indicating that the nature of this particular structure has evolved based on the functional demands of the tendon.
Relevance and Future Directions
- The findings from this study make a significant contribution to our understanding of tendon structure-function relationships, particularly the critical role the IFM plays in this context.
- Enhanced comprehension in this area is crucial for developing preventative measures or designing treatments for tendon injuries—especially those that specifically target the interfascicular matrix.
- The ability of the IFM and fascicles in energy-storing tendons to cope under high levels of cyclic strain and show improved fatigue resistance opens up potential paths for further research and possible treatment approaches for tendon injuries.
Cite This Article
APA
Thorpe CT, Riley GP, Birch HL, Clegg PD, Screen HRC.
(2016).
Fascicles and the interfascicular matrix show adaptation for fatigue resistance in energy storing tendons.
Acta Biomater, 42, 308-315.
https://doi.org/10.1016/j.actbio.2016.06.012 Publication
Researcher Affiliations
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK. Electronic address: c.thorpe@qmul.ac.uk.
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK.
- Institute of Orthopaedics and Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, Stanmore, HA7 4LP, UK.
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool, Leahurst Campus, Neston CH64 7TE, UK.
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK.
MeSH Terms
- Adaptation, Physiological
- Animals
- Biomechanical Phenomena
- Extracellular Matrix / physiology
- Horses
- Muscle Fatigue
- Tendons / anatomy & histology
- Tendons / physiology
- Weight-Bearing
Grant Funding
- 18424 / Versus Arthritis
- MR/K006312/1 / Medical Research Council
- BB/K008412/1 / Biotechnology and Biological Sciences Research Council
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