Distribution of Treatment Time in Physiotherapeutic Application of Ultrasound

Grey, Kurt

doi:10.1016/s0031-9406(05)60492-0

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…Slow circular movements were applied using the transducer head over the painful paravertebral low back region. The duration of US was estimated for each patient using Grey’s formula [24]. The average local exposure time was planned to be one minute and the effective radiating area of the transducer head was 5 cm 2 .…”

Section: Methodsmentioning

confidence: 99%

The effect of continuous ultrasound on chronic non-specific low back pain: a single blind placebo-controlled randomized trial

Ebadi

Ansari

Naghdi

et al. 2012

BMC Musculoskelet Disord

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BackgroundNon-specific chronic low back pain (NSCLBP) is one of the most common musculoskeletal disorders around the world including Iran. One of the most widely used modalities in the field of physiotherapy is therapeutic ultrasound (US). Despite its common use, there is still inconclusive evidence to support its effectiveness in patients with NSCLBP. The objective of this study was to evaluate the effect of continuous US compared with placebo US additional to exercise therapy for patients with NSCLBP.MethodsIn this single blind placebo controlled study, 50 patients with NSCLBP were randomized into two treatment groups: 1) continuous US (1 MHz &1.5 W/cm2) plus exercise 2) placebo US plus exercise. Patients received treatments for 4 weeks, 10 treatment sessions, 3 times per week, every other day. Treatment effects were assessed in terms of primary outcome measures: 1) functional disability, measured by Functional Rating Index, and 2) global pain, measured by a visual analog scale. Secondary outcome measures were lumbar flexion and extension range of motion (ROM), endurance time and rate of decline in median frequency of electromyography spectrum during a Biering Sorensen test. All outcome variables were measured before, after treatment, and after one-month follow-up. An intention to treat analysis was performed. Main effects of Time and Group as well as their interaction effect on outcome measures were investigated using repeated measure ANOVA.ResultsAnalysis showed that both groups had improved regarding function (FRI) and global pain (VAS) (P < .001). Lumbar ROM as well as holding time during the Sorensen test and median frequency slope of all measured paravertebral muscles did not change significantly in either group (P > .05). Improvement in function and lumbar ROM as well as endurance time were significantly greater in the group receiving continuous US (P < .05).ConclusionsThe study showed that adding continuous US to a semi supervised exercise program significantly improved function, lumbar ROM and endurance time. Further studies including a third group of only exercise and no US can establish the possible effects of placebo US.Trial registrationNTR2251

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Section: Methodsmentioning

confidence: 99%

The effect of continuous ultrasound on chronic non-specific low back pain: a single blind placebo-controlled randomized trial

Ebadi

Ansari

Naghdi

et al. 2012

BMC Musculoskelet Disord

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“…Although dynamic protocols are often recommended to avoid hot spots, this strategy incorporates certain subjectivities to the therapy that could influence the overall efficacy. For instance, the definitive protocol for applying the therapy is often chosen by therapists based on their own experience, from which they decide the size of the treatment area (e.g., twice the transducer emitting surface) [19] and the treatment dose [20]. The scanning speed also depends on the therapist, but it has been reported by Weaver et al [21] that the changes in average heating using different scanning speed within a specific treatment area were not significant.…”

Section: Introductionmentioning

confidence: 99%

“…The scanning speed also depends on the therapist, but it has been reported by Weaver et al [21] that the changes in average heating using different scanning speed within a specific treatment area were not significant. Grey in 2003 [19] found significant variations in the scanning speed and important differences in the dynamic strategies of therapy application when analyzing the transducer movement patterns produced by different therapists. Demchak and Stone [22] reported a difference in deep heating in human subjects when using clinically observed treatment parameters and the recommended treatment parameters that research suggested.…”

Section: Introductionmentioning

confidence: 99%

“…They also assumed the radiator as a piston source and they validated their numerical results with the Rayleigh integral. On the basis of the ideal vibrating piston, Grey [19] calculated the distribution of superficial energy that resulted from therapy applications by 22 therapists; however, Grey did not present the validation of either the resulting heating model or the simplified acoustic model. Recently, Miller et al [26] measured in vivo temperature distributions generated by therapeutic ultrasound in human triceps surae muscle group during a dynamical treatment protocol on a region of two times the size of the transducer head.…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, a finite element (FE) model of ultrasonic heating produced by a theoretical piston is compared with the heating produced by a real physiotherapy ultrasound applicator; the second approach using the measured acoustic field to feed the FE model and determine the heating is also shown. For the experiments and models, a static therapy protocol is used since in this modality the dosage is directly correlated to treatment time while presenting few effects of thermal dissipation by conduction [19]. Additionally, this approach eliminates the need to consider therapist-dependent variables, such as the scanning speed of the applicator and the irregular size of the treated area.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Verification of Modeled Thermal Distribution Produced by a Piston Source in Physiotherapy Ultrasound

Gutiérrez

Lopez-Haro

Vera

et al. 2016

BioMed Research International

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Objectives. To present a quantitative comparison of thermal patterns produced by the piston-in-a-baffle approach with those generated by a physiotherapy ultrasonic device and to show the dependency among thermal patterns and acoustic intensity distributions. Methods. The finite element (FE) method was used to model an ideal acoustic field and the produced thermal pattern to be compared with the experimental acoustic and temperature distributions produced by a real ultrasonic applicator. A thermal model using the measured acoustic profile as input is also presented for comparison. Temperature measurements were carried out with thermocouples inserted in muscle phantom. The insertion place of thermocouples was monitored with ultrasound imaging. Results. Modeled and measured thermal profiles were compared within the first 10 cm of depth. The ideal acoustic field did not adequately represent the measured field having different temperature profiles (errors 10% to 20%). Experimental field was concentrated near the transducer producing a region with higher temperatures, while the modeled ideal temperature was linearly distributed along the depth. The error was reduced to 7% when introducing the measured acoustic field as the input variable in the FE temperature modeling. Conclusions. Temperature distributions are strongly related to the acoustic field distributions.

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Skin Contribution to Heating by Ultrasonic Field Irradiation: Simulation of a Multilayer Biological Application

2019

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Distribution of Treatment Time in Physiotherapeutic Application of Ultrasound

Cited by 12 publications

References 20 publications

The effect of continuous ultrasound on chronic non-specific low back pain: a single blind placebo-controlled randomized trial

The effect of continuous ultrasound on chronic non-specific low back pain: a single blind placebo-controlled randomized trial

Experimental Verification of Modeled Thermal Distribution Produced by a Piston Source in Physiotherapy Ultrasound

Skin Contribution to Heating by Ultrasonic Field Irradiation: Simulation of a Multilayer Biological Application

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