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ABSTRACT Objective: To compare the mechanical properties of the supraspinatus tendon in different age groups using Supersonic Shearwave Imaging (SSI) elastography. Methods: We evaluated 38 healthy individuals of both genders, 20 being in the range of 20 to 35 years and 18 being over 60 years. The shear modulus of the supraspinatus tendon was measured by SSI elastography, always on the right side. Means between age groups were compared and statistically analyzed using the Shapiro-Wilk normality test followed by the student's t-test and were established as a statistically significant value of p ≤ 0.05. Results: A statistically significant difference was observed when the mean values of the shear modulus of the supraspinatus tendon of young adults (23.98 ± 9.94 KpA) were compared with those of older adults (17.92 ± 6.17 KpA). Conclusion: We found a difference between the means of the shear modulus measured by the SSI elastography, showing a significant decrease of the shear modulus with the chronological age progression. Level of Evidence III, Diagnostic Studies - Investigating a Diagnostic Test.
RESUMO Objetivo: Comparar as propriedades mecânicas do tendão supraespinal em diferentes grupos etários, utilizando a elastografia Supersonic Shearwave Imaging (SSI). Métodos: Foram avaliados 38 indivíduos saudáveis de ambos os sexos, sendo 20 na faixa de 20 a 35 anos e 18 acima dos 60 anos de idade. Foi aferido o módulo de cisalhamento do tendão supraespinal por elastografia SSI, sempre do lado direito. As médias entre os grupos etários foram comparadas e analisadas estatisticamente, sendo utilizado o teste de normalidade Shapiro-Wilk seguido do student t-test e estabelecido como valor de significância estatística um p ≤ 0,05. Resultados: Foi evidenciada diferença estatisticamente significativa quando comparadas as médias do módulo de cisalhamento do tendão supraespinal dos adultos jovens (23,98 ± 9,94 KpA) com a dos idosos (17,92 ± 6,17 KpA). Conclusão: Houve diferença entre as médias do módulo de cisalhamento medido pela elastografia com SSI, demonstrando diminuição significativa do módulo de cisalhamento com a progressão da idade cronológica. Nível de Evidência III, Estudos diagnósticos - Investigação de um exame para diagnóstico.
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Introduction Currently, little attention is given to the muscle architecture reliability studies of the hamstring using a robust statistical. Our purpose was to determine the reliability of ultrasound measurements of muscle thickness, fascicle length and pennation angle of the biceps femoris and semitendinosus muscles, including heteroskedasticity and internal consistency analyses. Methods Two images of biceps femoris and semitendinosus at 50% of the thigh length were acquired from 21 volunteers, in two visits. The parameters were measured three times in each image, and for each muscle. The reliability was analyzed by the intraclass correlation coefficient (ICC) and Cronbach’s alpha (αCronbach). The relative standard error of the measurements (%SEM) were calculated and Bland-Altman plots were generated. Results All parameters presented excellent ICC for the three repeated measurements (ICC from 0.93 ‒ 0.99) and moderate to excellent reliability intraday (ICC from 0.70 ‒ 0.95) for both muscles. The present study indicates that ultrasound is a reliable tool to estimate the biceps femoris fascicle length (ICC = 0.97, αCronbach = 0.98, %SEM = 7.86) and semitendinosus (ICC = 0.90, αCronbach = 0.95, %SEM = 7.55), as well as the biceps femoris muscle thickness (ICC = 0.89, αCronbach = 0.94, %SEM = 10.23) and semitendinosus muscle thickness (ICC = 0.87, αCronbach = 0.93, %SEM = 1.35). At last, biceps femoris pennation angle (ICC = 0.93, αCronbach = 0.96 and %SEM = 4.36) and semitendinosus (ICC = 0.96, αCronbach = 0.98 and %SEM = 4.25) also had good repeatability. Conclusion Ultrasonography show good repeatability in estimating of muscle architecture parameters.