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Orthopaedic Proceedings
Vol. 104-B, Issue SUPP_10 | Pages 79 - 79
1 Oct 2022
BIOFILM REMOVAL USING PULSE LAVAGE AND ELECTRICAL FIELDS: AN IN VITRO STUDY
Bernaus M Cubillos YL Soto S Bermúdez A Calero JA Torres D Veloso M Font-Vizcarra L
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Aim

To evaluate the efficiency of pulse lavage combined with electrical fields to remove biofilm from a metallic surface.

Method

Using a 12-well culture plate designed for the application of electrical fields, strains of S. epidermidis were incubated at each well for 24 hours at 37ºC. After incubation, supernatant culture medium was removed, and each well was filled with 3ml of normal saline. Six different models were compared: a) control, b) low-pressure pulse lavage, c) high-pressure pulse lavage, d) pulsed electrical fields, e) low-pressure pulse lavage in combination with pulsed electrical fields, and f) high-pressure pulse lavage in combination with pulsed electrical fields. In all cases, exposure time was set to 25 seconds. In the electrical field models, 50 pulses were applied.

After exposure, each bottom electrode was scraped carefully to release adhered bacteria. Subsequently, different dilutions of biofilm removed were spread onto Müller Hinton agar plates and incubated for 24h at 37 ºC, and colony-forming units (CFU) per milliliters were counted. Bacterial counts were then compared to the control model.

Orthopaedic Proceedings
Vol. 101-B, Issue SUPP_14 | Pages 22 - 22
1 Dec 2019
IN VITRO EVALUATION OF BACTERIAL ADHESION AND BIOFILM FORMATION TO METALLIC CERCLAGE WIRE VERSUS POLYMER CERCLAGE SYSTEM
Veloso M Bernaus M Angles F Gómez L Cubillos YL Soto S Font-Vizcarra L
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Aim

To evaluate bacterial adhesion and biofilm formation to metallic cerclage wire versus polymer cerclage system (SuperCable®)

Methods

Experimental in vitro study to evaluate quantitative bacterial adherence to different cerclage wire materials. Two types of cerclage wires were compared: a metallic versus a polymer based wire (SuperCable®).

A two-centimeter cerclage wire piece of each material was included in 2 mL of tryptic soy broth (TSB) culture media, inoculated with 10 microliters of a 0.5 McFarland of a Staphylococcus epidermidis strain and cultivated at 37°C during 2h for adhesion and 48h for biofilm formation. After this time, the cerclages were washed using a 1% phosphate buffered saline (PBS) and sonicated in new culture medium. After sonication, dilutions of each culture were spread in TSB agar and incubated 37°C during 24h. The number of colonies were counted and the cfu/cm2 was calculated.