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Measurement of temperature induced in bone during drilling in minimally invasive foot surgery.

Foot 2018 June
INTRODUCTION: There has been growing interest in minimally invasive foot surgery due to the benefits it delivers in post-operative outcomes in comparison to conventional open methods of surgery. One of the major factors determining the protocol in minimally invasive surgery is to prevent iatrogenic thermal osteonecrosis. The aim of the study is to look at various drilling parameters in a minimally invasive surgery setting that would reduce the risk of iatrogenic thermal osteonecrosis.

METHOD: Sixteen fresh-frozen tarsal bones and two metatarsal bones were retrieved from three individuals and drilled using various settings. The parameters considered were drilling speed, drill diameter, and inter-individual cortical variability. Temperature measurements of heat generated at the drilling site were collected using two methods; thermocouple probe and infrared thermography. The data obtained were quantitatively analysed.

RESULTS: There was a significant difference in the temperatures generated with different drilling speeds (p<0.05). However, there was no significant difference in temperatures recorded between the bones of different individuals and in bones drilled using different drill diameters. Thermocouple showed significantly more sensitive tool in measuring temperature compared to infrared thermography.

CONCLUSION: Drilling at an optimal speed significantly reduced the risk of iatrogenic thermal osteonecrosis by maintaining temperature below the threshold level. Although different drilling diameters did not produce significant differences in temperature generation, there is a need for further study on the mechanical impact of using different drill diameters.

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