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Copyright (c) 2023 Proceedings on Automation in Medical Engineering
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Bone screw tightening torque is important to achieve the best patient outcomes in orthopedic procedures. Here, an automatic method was tested for determining the stripping torque of a screw during the initial insertion of the screw. This involved an inverse model to determine material strength, followed by a forward model to estimate stripping torque. This method was tested on 2 different densities of polyurethane foam as a substitute for real bone. It was found the model-identified/estimated strengths/torques closely followed the datasheet/measured values. This method shows promise for predicting stripping torque. However, further work is needed to better quantify the accuracy.