Effect of Metallic Objects on Temperature Rises Produced in Tissue by Ultrasound1

Gersten, Jerome W.

doi:10.1097/00002060-195804000-00002

Cited by 15 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, Cambier et al (2001) stated that a lower frequency corresponded to greater muscle heating in cadavers, which was not confirmed in the present study. Gersten (1958) also conducted studies to verify the intramuscular temperature in dogs subjected to the placement of a metal plate and found higher temperatures in the presence of the implant; they related this result to high temperatures close to the muscle-metal plate interface, which were not observed in the present study (Table 1) because the temperatures in CGI and CGII were higher than in their respective test groups (TGI and TGII).…”

Section: Resultsmentioning

confidence: 47%

“…However, its use in areas with metal implants is still controversial, with some authors stating that there are no problems (Lehmann et al, 1959), whereas others recommend precaution (Steiss et al, 2004) and even contraindicate it (Young, 2003). In the presence of a metal implant, TUS application could cause a local overheating with serious damage to the adjacent tissues (Gersten, 1958).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heating produced by therapeutic ultrasound in the presence of a metal plate in the femur of canine cadavers

Andrades¹,

Mazzantí²,

Beckmann³

et al. 2014

Arq. Bras. Med. Vet. Zootec.

View full text Add to dashboard Cite

Heating produced by therapeutic ultrasound in the presence of a metal plate in the femur of canine cadavers ABSTRACTThe present study aimed to assess the heat generated by a therapeutic ultrasound (TUS) in a metal bone plate and adjacent structures after fixation to the femur of canine cadavers. Ten pairs of hind limbs were used, and they were equally distributed between groups that were subjected to 1-and 3-MHz frequencies, with each frequency testing 1-and 2-W/cm² intensities. The right hind limb was defined as the control group (absence of the metal plate), and the left hind limb was the test group (presence of the metal plate). Therefore, the control groups (CG) were denominated CGI, using TUS with 1-MHz frequency and 1-W/cm² intensity; CGII, using 1-MHz frequency and 2-W/cm² intensity; CGIII, using 3-MHz frequency and 1-W/cm² intensity; and CGIV, using 3-MHz frequency and 2-W/cm² intensity. For each control group, its respective test group (TG) was denominated TGI, TGII, TGIII and TGIV. The TUS was applied to the lateral aspect of the thigh using the continuous mode and a 3.5-cm² transducer in a 6.25-cm² area for 2 minutes. Sensors were coupled to digital thermometers that measured the temperature in different sites before (t 0 ) and after (t 1 ) of the TUS application. The temperatures in t 1 were higher in all tested groups. The intramuscular temperature was significantly higher (P < 0.05) in the groups used to test the 3-MHz frequency in the presence of the metal plate. The therapeutic ultrasound in the continuous mode using frequencies of 1 and 3 MHz and intensities of 1 and 2 W/cm 2 for 2 minutes caused heating of the metal plate and adjacent structures after fixation to the femur of canine cadavers.

show abstract

Section: Resultsmentioning

confidence: 47%

Section: Introductionmentioning

confidence: 99%

Heating produced by therapeutic ultrasound in the presence of a metal plate in the femur of canine cadavers

Andrades¹,

Mazzantí²,

Beckmann³

et al. 2014

Arq. Bras. Med. Vet. Zootec.

View full text Add to dashboard Cite

show abstract

“…Such reflection could result in the focusing of ultrasonic intensity in such a fashion that "hot spots" could develop, resulting in overheating of the tissues. In vitro experimental results demonstrated that a large amount of ultrasonic energy is reflected at the tissue-metal implant surface [9]. The increase of intensity in the focal area has been measured and found to be appreciable.…”

Section: Introductionmentioning

confidence: 94%

“…The biophysical effects of therapeutic ultrasound on tissues 2 of 16 result from two mechanisms: (1) thermal effects due to continuous acoustic wave, and (2) non-thermal effects due to pulse acoustic wave [8]. However, there are few studies [9][10][11][12][13] that take into account the presence of implants during ultrasound diathermy and discuss the influence of implants on the temperature field in the tissues near the implant.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simplified Theoretical Model for Temperature Evaluation in Tissue–Implant–Bone Systems during Ultrasound Diathermy

Huang

2020

Applied Sciences

View full text Add to dashboard Cite

Featured Application: This study could provide useful information to clinicians and the optimal selection of a slab implant material could be obtained under given specifications for therapeutic ultrasounds.Abstract: Deep heating procedures are helpful in treating joint contractures that frequently occur with fractures and joint diseases involving surgical implants and artificial joint prostheses. This study uses a one-dimensional composite medium model consisting of parallel slabs as a simplified approach to shed light on the influences of implants during ultrasound diathermy. Analytical solutions for the one-dimensional transient heat generation and conduction problem were derived using the orthogonal expansion technique and a Green's function approach. The analytical solutions provided deep insight into the temperature profile by therapeutic ultrasound heating in the composite system. The effects of the implant material type, tissue thickness, and ultrasound operation frequency on temperature distribution were studied for clinical application. In addition, sensitivity analyses were carried out to investigate the influences of material properties on the temperature distribution during ultrasound diathermy. Based on the derived analytical solutions, the numerical simulations indicate that materials with high density, high specific heat, and low thermal conductivity may be optimal implant materials. Among available implant materials, a tantalum implant, which can achieve a lower temperature rise within the tissue (hydrogel) and bone layers during ultrasound diathermy, is a better choice thanks to its thermodynamics.

show abstract

Effect of ultrasound on mobility in osteoarthritis of the knee. A randomized clinical trial

Falconer

Hayes

Chang

1992

Arthritis & Rheumatism

100

View full text Add to dashboard Cite

Ultrasound increases soft tissue extensibility and may be an effective adjunct in the treatment of knee contractures secondary to connective tissue shortening. A randomized clinical trial was conducted to determine the effectiveness of ultrasound in relieving stiffness and pain in patients (age x = 67.5 years, SD = 13.0) who had osteoarthritis (OA) and a chronic knee contracture. Subjects received 12 treatments of exercise preceded by either ultrasound (n = 34) or sham ultrasound (n = 35) and a blinded evaluation at baseline, after treatment, and 2 months after treatment. MANCOVA controlling for baseline scores showed that there were no significant differences in knee active range of motion (ROM) (goniometry) or pain (visual analogue scale) between experimental and control groups. Possible explanations for the no difference finding involve dosage issues, muscle shortening, transiency of effects, and the effects of exercise. Paired t‐tests revealed that both groups significantly improved (p < 0.05) in active ROM, pain, and gait velocity, and maintained improvement for at least 2 months. Although ultrasound may not contribute to the management of patients with chronic knee stiffness and OA, benefits of the exercise program and increased activity secondary to program participation probably influenced the overall improvement.

show abstract

Effect of Metallic Objects on Temperature Rises Produced in Tissue by Ultrasound1

Cited by 15 publications

References 0 publications

Heating produced by therapeutic ultrasound in the presence of a metal plate in the femur of canine cadavers

Heating produced by therapeutic ultrasound in the presence of a metal plate in the femur of canine cadavers

Simplified Theoretical Model for Temperature Evaluation in Tissue–Implant–Bone Systems during Ultrasound Diathermy

Effect of ultrasound on mobility in osteoarthritis of the knee. A randomized clinical trial

Contact Info

Product

Resources

About