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- Talk
- 15/09/2021
- Canada
Induced Membrane Technique: Effects of Antbiotic-impregnated Spacers on Healing of a Critical-size Femoral Defect in a Rat Model
Description
The presentation, delivered by Hening, elaborates on the induced membrane technique, also known as the Masquelet technique. This method is increasingly recognized for treating segmental bone defects and nonunions, involving a two-stage procedure that incorporates the insertion of a polymethylmethacrylate (PMMA) spacer and subsequent bone grafting after membrane formation. Hening's research investigates the effects of antibiotic-impregnated spacers on healing in a rat model with critical-sized femoral defects, raising questions regarding the impact of varying antibiotic concentrations on bone healing.
The study divides rats into three groups: a control with just PMMA, a low-dose antibiotic group, and a high-dose antibiotic group. After creating a femoral defect and implanting the spacers, assessments are made over 12 weeks using X-ray and Micro-CT imaging to analyze bone healing metrics. Results indicate that the low-dose antibiotic group showed the highest union rates and bone mineral density, while high-dose antibiotics may negatively affect healing, as evidenced by lower bone volume. Hening discusses the implications of these findings for clinical practice, especially the cautious use of high-dose antibiotics, while acknowledging study limitations such as the aseptic conditions under which surgeries were performed, and the single time point between stages of treatment.