The impact of ultrasound waves on changes in temperature around titanium orthopaedic implants – experimental studies
Journal Title: European Journal of Medical Technologies - Year 2016, Vol 11, Issue 2
Abstract
Introduction. Ultrasound waves were first used in medicine in 1938. Nowadays ultrasound procedures are often recommended in the treatment of many diseases. However, despite long-standing clinical experience, the literature draws our attention to discrepancies in clinically confirmed recommended therapeutic doses, and to contraindications to the use of ultrasounds. Among the commonly indicated contraindications is the presence of metal implants in the treatment region. Objectives. The objective of this study was to assess temperature changes caused by ultrasound waves around titanium orthopaedic implants, using an experimental model. Materials and methods. A titanium alloy located on the model of a composite bone was examined in this study as experimental model. The model was subjected to sonification in an aquatic environment. The procedures were carried out using the continuous method and the doses 0.3 W/cm2, 0.8 W/cm2 and 1.2 W/cm2. 30 procedures were conducted for each of the doses. The sonification amounted to 3 minutes. Temperature changes were measured using a professional 4 channels thermometer and type K thermocouples. Results. Throughout the sonification procedure with a dose of 0.3 W/cm2 the average difference between the maximum and minimum temperatures recorded by the T1 probe were equal to 0.34°C, T2 - 0.16°C, T3 - 0.01°C, T4 - 0.1°C. During the procedure with ultrasound waves at dose of 0.8 W/cm2 and 1.2 W/cm2 the average difference between temperatures were respectively: T1 - 0,68°C, T2 - 0,6°C, T3 - 0,15°C, T4 – 0,1°C and T1 - 2,08°C, T2 - 1,35°C, T3– 0,26°C, T4 –0,12°C. Conclusions. 1. In the experimental conditions, the utilisation of ultrasound waves at doses of 0.3 W/cm2 and 0.8 W/cm2 for 3 minutes resulted in an increase in temperature in the titani-um implant region of less than 0.7°C, and at a dose of 1.2 W/cm2 of nearly 2°C. 2. The presence of titanium orthopaedic implants in tissues does not constitute an absolute contraindication to employing sonification at small and medium doses. This, however, should be confirmed by in vivo studies.
Authors and Affiliations
Tomasz Zawiślak, Piotr Turmiński, Robert Latosiewicz, Olga Chapska, Dulce Estevez
Keywords
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