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Thermal osteonecrosis and bone drilling parameters revisited

  • Trauma Surgery
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Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

During the drilling of the bone, the temperature could increase above 47°C and cause irreversible osteonecrosis. The result is weakened contact of implants with bone and possible loss of rigid fixation. The aim of this study was to find an optimal condition where the increase in bone temperature during bone drilling process would be minimal.

Materials and methods

Influence of different drill parameters was evaluated on the increase of bone temperature. Drill diameters were 2.5, 3.2 and 4.5 mm; drill speed 188, 462, 1,140 and 1,820 rpm; feed-rate 24, 56, 84 and 196 mm/min; drill point angle 80°, 100° and 120° and external irrigation with water of 26°C.

Results

Combinations of drill speed and drill diameter with the use of external irrigation produced temperatures far below critical. Without external irrigation, temperature values for the same combination of parameters ranged 31.4–55.5°C. Temperatures above critical were recorded using 4.5 mm drill with higher drill speeds (1,140 and 1,820 rpm). There was no statistical significance of different drill point angles on the increase or decrease of bone temperature. The higher the feed-rate the lower the increase of bone temperature.

Conclusions

The external irrigation is the most important cooling factor. With all combinations of parameters used, external irrigation maintained the bone temperature below 47°C. The increase in drill diameter and drill speed caused increase in bone temperature. The changes in drill point angle did not show significant influence in the increase of the bone temperature. With the increase in feed-rate, increase in bone temperature is lower.

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Acknowledgments

This experiment is a part of the scientific project: Biomechanics of fractures and fracture healing and is supported by The Ministry of Science, Education and Sports.

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Correspondence to Goran Augustin.

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Augustin, G., Davila, S., Mihoci, K. et al. Thermal osteonecrosis and bone drilling parameters revisited. Arch Orthop Trauma Surg 128, 71–77 (2008). https://doi.org/10.1007/s00402-007-0427-3

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  • DOI: https://doi.org/10.1007/s00402-007-0427-3

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