scholarly journals Confiabilidade da estimativa do módulo tangente do tendão calcanear / Reliability of the estimate of the tangent modulus of the calcaneal tendon

2021 ◽  
Vol 7 (9) ◽  
pp. 88727-88736
Author(s):  
Mariana Souza Pinto ◽  
Natália Santos da Fonseca Martins ◽  
Luciano Luporini Menegaldo ◽  
Liliam Fernandes De Oliveira
Keyword(s):  
Tangent Modulus ◽  
Calcaneal Tendon

scholarly journals Serial Ultrasonographic and Real-Time Elastosonographic Assessment of the Ovine Common Calcaneal Tendon, after an Experimentally Induced Tendinopathy

2021 ◽  
Vol 8 (4) ◽  
pp. 54
Author(s):  
Daniele Serrani ◽  
Antonella Volta ◽  
Franco Cingolani ◽  
Luca Pennasilico ◽  
Caterina Di Bella ◽  
...  
Keyword(s):  
Real Time ◽  
Statistical Significance ◽  
Healing Process ◽  
Tendon Healing ◽  
Tissue Elasticity ◽  
Calcaneal Tendon ◽  
Non Invasive ◽  
Type Ia ◽  
Single Operator ◽  
Experimentally Induced

Real-time elastosonography (RTE) is a recently described, non-invasive, ultrasonographic technique developed to assess tissue elasticity. The main aim of this study was to investigate the ultrasonographic and elastosonographic appearance of the common calcaneal tendon (CCT) in an ovine model, and to monitor the progression of tendon healing after an experimentally-induced tendinopathy. Sound tendons were initially evaluated (T0) with a caliper and by a single operator with ultrasound. Ultrasonographic and elastosonographic images were then acquired. Subsequently, ultrasound-guided tendon lesions were induced by injecting 500 IU of Type IA collagenases proximally to the calcaneal tuberosity. Caliper measurement, ultrasonography and elastosonography were then repeated at 15 (T1), 30 (T2) and 60 (T3) days. Clinically measured width of the tendon, ultrasonographic thickness and width and percentage of hard (Elx-t%hrd) and soft (Elx-t%sft) tissue were recorded. Statistical analysis was performed on the data collected; statistical significance was set at p < 0.05. Intra-class correlation coefficient (ICC) revealed good (0.68) repeatability of elastosonographic evaluation of the CCT. The tendon width was significantly increased when comparing T0 with T1–2 and decreased when comparing T1–2 with T3. Ultrasound-assessed thickness was significantly increased between T0–T1 and decreased between T1-T2–3. Elx-t%hrd was significantly decreased at T1–2–3 and Elx-t%sft was significantly increased at T1–2–3. In conclusion, the ovine CCT is a highly stiff structure that undergoes a severe loss of stiffness during the healing process. Thickness and width of the tendon increased during the first 30 days and then reduced progressively along the subsequent 30 days. Ultrasonographic appearance of the tendon remained severely abnormal and the tendon showed severely reduced elastic proprieties 60 days after lesion induction.

Effects of low-intensity non-coherent light therapy on the inflammatory process in the calcaneal tendon of ovariectomized rats

2015 ◽  
Vol 31 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Carla Helrigle ◽  
Paulo deTarso Camilo de Carvalho ◽  
Heliodora Leão Casalechi ◽  
Ernesto Cesar Pinto Leal-Junior ◽  
Guilherme Henrique Cardoso Fernandes ◽  
...  
Keyword(s):  
Inflammatory Process ◽  
Light Therapy ◽  
Ovariectomized Rats ◽  
Coherent Light ◽  
Calcaneal Tendon ◽  
Low Intensity

Effects of Passive Stretching on the Biochemical and Biomechanical Properties of Calcaneal Tendon of Rats

2009 ◽  
Vol 50 (5) ◽  
pp. 279-284 ◽  
Author(s):  
Fernanda Martins de Almeida ◽  
Tatiana Carla Tomiosso ◽  
Wilson Romero Nakagaki ◽  
Laurecir Gomes ◽  
Stela Marcia Goncalve Matiello-Rosa ◽  
...  
Keyword(s):  
Biomechanical Properties ◽  
Calcaneal Tendon ◽  
Passive Stretching

Cerebrotendinous xanthomatosis with radiological abnormalities of the chest

2021 ◽  
Vol 14 (9) ◽  
pp. e243715
Author(s):  
Yoshiaki Zaizen ◽  
Masaki Tominaga ◽  
Shuji Nagata ◽  
Tomoaki Hoshino
Keyword(s):  
Genetic Disease ◽  
Blood Cells ◽  
Lung Biopsy ◽  
Giant Cells ◽  
Cerebrotendinous Xanthomatosis ◽  
Histological Findings ◽  
Calcaneal Tendon ◽  
Pulmonary Lesions ◽  
Foamy Macrophages ◽  
Multinucleate Giant Cells

A 55-year-old man with mental retardation and calcaneal tendon thickening was referred for a suspected genetic disease. His serum cholestanol was elevated and genetic analysis of his blood cells for CYP27A1 revealed a homozygous missense mutation. We diagnosed him with cerebrotendinous xanthomatosis (CTX). Chest radiography revealed diffuse micronodular and reticular opacities. Histological findings obtained from the transbronchial lung biopsy revealed foamy macrophages and multinucleate giant cells with marked lipid crystal clefts. Although there are few reports of pulmonary lesions in CTX, we concluded from the radiological and histopathological findings that the pulmonary lesions were indeed caused by the CTX. The patient was treated with chenodeoxycholic acid. His neurological findings and calcaneal tendon thickening were unchanged; however, his serum cholestanol and radiological abnormalities of the chest decreased.

A Mathematical Model Depicting the Stress-Strain Diagram and the Hysteresis Loop

1959 ◽  
Vol 26 (1) ◽  
pp. 95-100
Author(s):  
I. R. Whiteman
Keyword(s):  
Mathematical Model ◽  
Hysteresis Loop ◽  
Yield Stress ◽  
Frequency Distribution ◽  
Elastic Region ◽  
Tangent Modulus ◽  
Strain Diagram ◽  
Cumulative Frequency ◽  
Cumulative Frequency Distribution ◽  
Stress Strain

Abstract A model is made up of elastoplastic elements, all of which have the same value of Young’s modulus E, but which have different values of yield stress. It is shown that the dimensionless tangent modulus graph Et/E represents the cumulative frequency distribution of those elements which are in the elastic region. From the frequency distribution, the equations for the stress-strain diagram and the hysteresis loop can be written.

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