Avaliação do comportamento mecânico dos tendões patelar e semitendinoso utilizando a elastografia por ondas de cisalhamento (SSI) e testes de tração

Resumo

Objetivo Analisar as propriedades mecânicas dos tendões patelar (TP) e semitendinoso (ST) obtidos de cadáveres humanos congelados enquanto ainda frescos, provenientes de banco de tecidos, utilizando elastografia por ondas de cisalhamento (supersonic shearwave imaging, SSI, em inglês) e testes de tração.

Métodos Sete amostras de TP e cinco de ST foram testadas em máquina de tração e simultaneamente avaliadas por SSI. As medidas geradas possibilitaram comparar o comportamento mecânico dos tendões por curva stress x strain e módulo de cisalhamento (μ) em repouso. Também foi analisada a relação stress x μ sob tensão, e testada a relação entre esses parâmetros. Os resultados foram submetidos a análise estatística pelos testes t não-pareado com correção de Welch, correlação de Pearson e regressão linear para estimativa do módulo de Young (E).

Resultados O μ dos TP e ST em repouso foi, respectivamente, de 58,86 ± 5,226 kPa e 124,3 ± 7,231 kPa, com diferença estatisticamente significativa. O coeficiente de correlação entre stress e μ dos TP e ST foi classificado como muito forte. O E calculado dos TP e ST foi, respectivamente, de 19,97 kPa e 124,8 kPa, com diferença estatisticamente significativa.

Conclusão O ST foi mais rígido do que o TP nos testes de tração e nas avaliações por SSI. O μ esteve diretamente relacionado com o stress a que o tendão é submetido.

Relevância clínica Avaliar as propriedades mecânicas dos tendões mais utilizados como enxerto nas cirurgias de reconstrução ligamentar do joelho.

Palavras-chave

módulo de Young - técnicas de imagem por elasticidade - tendão patelar

Trabalho desenvolvido no Serviço de Traumato-Ortopedia do Hospital Universitário Clementino Fraga Filho da Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.

Publikationsverlauf

Eingereicht: 20. November 2023

Angenommen: 18. März 2024

Artikel online veröffentlicht:
04. September 2024

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