Zhengmin Ruan1, Bin Zhao2, Hengtao Qi2, Yuan Zhang3, Feixue Zhang1, Mei Wu1, Guangrui Shao4. 1. Department of Ultrasound, Second Hospital of Shandong University, Shandong University Jinan, P.R. China. 2. Shandong Medical Imaging Research Institute, Shandong University Jinan, P.R. China. 3. Center of Evidence-based Medicine, Second Hospital of Shandong University Jinan, P.R. China. 4. Department of Radiology, Second Hospital of Shandong University Jinan, P.R. China.
Abstract
AIMS: The objective of the study was to investigate the value of acoustic radiation force impulse (ARFI) and its application in Achilles tendon elasticity of healthy volunteers. METHODS: Bilateral Achilles tendons of 56 healthy individuals were included in the study. The subjects were divided into four age groups. Shear wave velocities (SWVs) of each tendon in the states of relaxation and tension were measured using ARFI technology. We selected the middle section of the Achilles tendon for ARFI measurement. Each Achilles tendon was examined by a musculoskeletal radiologist. Longitudinal images of each tendon were obtained by ultrasound and ARFI elastography. A quantitative assessment of the tissue stiffness was made with virtual touch tissue quantification. RESULTS: Significant differences in SWVs of Achilles tendon were found between any two age groups in the same status (P < 0.05) and between different status in subjects aged 25-35 years (P < 0.05) and 36-45 years (P < 0.05). SWV of Achilles tendon increased with increasing age in both states of relaxation and tension, which was consistent with the histological feature of ageing tendons. However, there were no significant differences between men and women within any group in the same status (P > 0.05) or between different states in subjects aged 46-55 years (P = 0.308) and 56-65 years (P = 0.362). CONCLUSIONS: ARFI imaging provides quantitative information about tendon stiffness and represents an excellent supplementary technique to B-mode ultrasound. Furthermore, the elasticity of healthy tendon decreases with increasing age in subjects without disease and long-term heavy load lifting.
AIMS: The objective of the study was to investigate the value of acoustic radiation force impulse (ARFI) and its application in Achilles tendon elasticity of healthy volunteers. METHODS: Bilateral Achilles tendons of 56 healthy individuals were included in the study. The subjects were divided into four age groups. Shear wave velocities (SWVs) of each tendon in the states of relaxation and tension were measured using ARFI technology. We selected the middle section of the Achilles tendon for ARFI measurement. Each Achilles tendon was examined by a musculoskeletal radiologist. Longitudinal images of each tendon were obtained by ultrasound and ARFI elastography. A quantitative assessment of the tissue stiffness was made with virtual touch tissue quantification. RESULTS: Significant differences in SWVs of Achilles tendon were found between any two age groups in the same status (P < 0.05) and between different status in subjects aged 25-35 years (P < 0.05) and 36-45 years (P < 0.05). SWV of Achilles tendon increased with increasing age in both states of relaxation and tension, which was consistent with the histological feature of ageing tendons. However, there were no significant differences between men and women within any group in the same status (P > 0.05) or between different states in subjects aged 46-55 years (P = 0.308) and 56-65 years (P = 0.362). CONCLUSIONS: ARFI imaging provides quantitative information about tendon stiffness and represents an excellent supplementary technique to B-mode ultrasound. Furthermore, the elasticity of healthy tendon decreases with increasing age in subjects without disease and long-term heavy load lifting.
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