Low-Intensity Pulsed Ultrasound Accelerates Healing in Rat Calcaneus Tendon Injuries

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art_JEREMIAS JUNIOR_LowIntensity_Pulsed_Ultrasound_Accelerates_Healing_in_Rat_Calcaneus_2011.PDF (1.42 MB)
Citações na Scopus
30
Tipo de produção
article
Data de publicação
2011
DOI
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Editora
J O S P T,
Autores
JEREMIAS JUNIOR, Sergio Luiz
INGHAM, Sheila J. M.
ABDALLA, Rene Jorge
Citação
JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY, v.41, n.7, p.526-531, 2011
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
STUDY DESIGN: Controlled laboratory study. OBJECTIVE: To evaluate the effect of low-intensity therapeutic ultrasound on the murine calcaneus tendon healing process. BACKGROUND: Therapeutic ultrasound promotes formation and maturation of scar tissue. METHODS: Calcaneus tendon tenotomy and tenorrhaphy was performed on 28 Wistar rats. After the procedure, the animals were randomly divided into 2 groups. The animals in the experimental group received a 5-minute ultrasound application, once a day, at a frequency of 1 MHz, a spatial average temporal average intensity of 0.1 W/cm(2), and a spatial average intensity of 0.52 W/cm(2) at a 16-Hz frequency pulse mode (duty cycle, 20%). Data for the injured side were normalized in relation to the data from the contralateral healthy calcaneus tendon (relative values). The animals in the control group received sham treatment. After a 28-day treatment period, the animals were sacrificed and their tendons surgically removed and subjected to mechanical stress testing. The parameters analyzed were cross-sectional area (mm(2)), ultimate load (N), tensile strength (MPa), and energy absorption (mJ). RESULTS: A significant difference between groups was found for the relative values of ultimate load and tensile strength. The mean +/- SD ultimate load of the control group was -3.5% +/- 32.2% compared to 33.3% +/- 26.8% for the experimental group (P = .005). The mean tensile strength of the control group was -47.7% +/- 19.5% compared to -28.1% +/- 24.1% for the experimental group (P = .019). No significant difference was found in cross-sectional area and energy absorption. CONCLUSION: Low-intensity pulsed ultrasound produced by a conventional therapeutic ultrasound unit can positively influence the calcaneus tendon healing process in rats. J Ort hop Sports Phys Ther 2011;41(7):526-531, Epub 2 February 2011. doi:10.2519/jospt.2011.3468
Palavras-chave
biomechanical testing, physical agents, therapeutic ultrasound
URI
https://observatorio.fm.usp.br/handle/OPI/23264
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MOT
Artigos e Materiais de Revistas Científicas - LIM/41