Treatment time of ultrasound therapy interferes with the organization of collagen fibers in rat tendons

Abstract

| Background: The application time of therapeutic ultrasound is an infrequently studied dosimetric variable that affects tissue repair. Objectives: The aim of this study was to evaluate the effects of different treatment times of therapeutic ultrasound (US) on the organization of collagen fibers in the tendons of rats. Method: Forty Wistar rats were selected (300±45 g), and the rats were divided into five groups (n=8 for each group): Control, without tenotomy or any treatment; tenotomy group, with tenotomy and without treatment; US groups (US1, US2, and US3), subjected to tenotomy and treated with US for one, two, or three minutes per area of the transducer, respectively. The animals were sacrificed on the 12th post-operative day, and the tendons were surgically removed for analyses of the collagen fiber organization by means of birefringence analysis. Results: The collagen fibers exhibited better aggregation and organization in the US3 group compared with the tenotomy group (p<0.05). Conclusions: The findings suggest that US applied for three minutes per treated area improves the organization of collagen fibers during rat tendon repair.Keywords: therapeutic ultrasound; Achilles tendon; physical therapy; collagen; wound healing. HOW TO CITE THIS ARTICLE

Morphometric and Fractal Analysis of Injured Skeletal Muscle Tissue Subjected to A Combination of Treatments; Cryotherapy and Therapeutic Ultrasound

“…Application was performed on the anesthetized animals for seven days, lasting five minutes, in pulsed mode, at an intensity of 0.5 W/cm 2 and frequency of 1 MHz (Farcic et al, 2013). Water-soluble gel was used as a medium of conduction, making circular motions, focusing on the muscle belly region, where the injury had been induced (Piedade et al).…”

Systematic Review of Photobiomodulation Therapy (PBMT) on the Experimental Calcaneal Tendon Injury in Rats

“…Tendinitis is an inflammatory response resulting from repetitive strain on the tendon, which gradually loses its ability to withstand tension and mechanical stress. This continuous process of repetitive effort, gradual loss of its mechanical properties and difficulty in repair process, negatively impacts the rehabilitation of individuals (3,4). In this context, calcaneal tendon injuries are considered as serious orthopedic and traumatic problems, which are associated with the aging of the population and the demands of overloads during exercise.…”

Uso del ultrasonido terapéutico pulsado en el tratamiento de personas con osteoartritis de rodilla

“…Sin embargo, el tiempo de tratamiento es una variable justificada con poca frecuencia en los estudios que aplican UST 27 . Oakley 28 , propuso aplicar UST durante uno o dos minutos en cada área de tratamiento correspondiente a tamaño y medio del cabezal, aunque esta relación no es justificada 27,28 .…”

“…Sin embargo, el tiempo de tratamiento es una variable justificada con poca frecuencia en los estudios que aplican UST 27 . Oakley 28 , propuso aplicar UST durante uno o dos minutos en cada área de tratamiento correspondiente a tamaño y medio del cabezal, aunque esta relación no es justificada 27,28 . Algunos autores como Olsson et al 29 concluyen que no hay fórmula establecida para determinar el tiempo de tratamiento recomendado para el uso del UST.…”