Electrosurgery is a commonly used device in the operating room, but it has some adverse effects, which are only partly described in literature. Interference issues are well described, but unintended heating in and around implants is not well studied. We simulated different scenarios using a Finite Element Model to investigate unintended heating caused by electrosurgery. We looked at different shapes, sizes, and active electrode placements. We found that all these factors play a role in the amount of heating.