NUMERICAL MODELLING AND SIMULATION OF BONE DRILLING TO MINIMIZE BONE NECROSIS BY CONTROLLING HEAT GENERATIONS

Bone drilling method is one of the medical approaches to handle fracture in
trauma injury. It involves the insertion of a screw and/or a plate for temporary
support. However, drilling generates heat thus causing thermal necrosis. The
temperature which reach above thermal necrosis threshold during drilling causes
two problems; the bone tissue losses its regeneration ability and loosening of the
surgical fixation over time. This project aims to develop appropriate numerical
heat transfer model adaptation of the heat source approach for bone drilling with
the purpose of minimizing thermal necrosis. Method of investigations used were
numerical modeling and simulation using ANSYS parametric design language
(apdl). The relationship of drill speed, feed rate, point angle, helix angle and drill
bit diameter were investigated using the heat source model. Prediction of the
temperature distribution and a parametric study was conducted.