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Ultrasound Tissue Characterization of Human Achilles Tendon by Stability Quantification of Echo Patterns
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Achilles and patellar tendinopathy display opposite changes in elastic properties: A shear wave elastography study
B K Coombes1, K Tucker1, B Vicenzino2
1School of Biomedical Sciences, The University of Queensland, Brisbane, Qld, Australia.
Scandinavian Journal of Medicine & Science in Sports
|October 4, 2017
Summary
Achilles tendinopathy is linked to lower Achilles tendon elasticity, while patellar tendinopathy shows higher patellar tendon elasticity. These findings suggest distinct mechanical properties in different tendinopathies.
Area of Science:
- Biomechanical analysis of tendon properties
- Musculoskeletal research
- Sports medicine
Background:
- Tendinopathies, including Achilles and patellar, are common musculoskeletal conditions.
- Understanding the elastic and structural properties of tendons is crucial for diagnosis and treatment.
- Previous research has indicated alterations in tendon properties, but direct comparisons between Achilles and patellar tendinopathy are limited.
Purpose of the Study:
- To compare the tendon elastic and structural properties of individuals with Achilles tendinopathy and patellar tendinopathy against healthy controls.
- To investigate differences in shear wave velocity (SWV) and tendon thickness between the two tendinopathy groups and different tendon regions.
Main Methods:
- A comparative study involving 67 participants: 22 with Achilles tendinopathy, 17 with patellar tendinopathy, and 28 healthy controls.
- Bilateral measurements of SWV (elastic modulus index) and tendon thickness at mid-tendon and insertional regions using ultrasound.
- Analysis of covariance (ANCOVA) adjusted for age, BMI, and sex to compare groups and regions, with tendon thickness as a covariate for SWV analysis.
Main Results:
- Achilles tendinopathy group showed lower SWV at the distal Achilles tendon insertion and greater mid-tendon thickness compared to controls.
- Patellar tendinopathy group exhibited higher SWV in both measured regions and increased proximal thickness compared to controls.
- Overall, Achilles tendinopathy correlated with lower Achilles tendon elastic modulus, while patellar tendinopathy correlated with higher patellar tendon elastic modulus.
Conclusions:
- Individuals with Achilles tendinopathy demonstrate reduced Achilles tendon elasticity, whereas those with patellar tendinopathy exhibit increased patellar tendon elasticity.
- These distinct mechanical profiles suggest that different underlying mechanisms may contribute to each condition.
- Further research is warranted to explore the roles of maturation, aging, and chronic loading, and to determine if current treatment strategies need to be condition-specific.
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