subcutaneous electrodes can be divided into percutaneous and implanted electrodes. the percutaneous electrodes consist of thin wires inserted through the skin and into muscular tissue close to the targeted nerve. these electrodes typically remain in place for a short period of time and are only considered for short-term fes interventions. however, it is worth mentioning that some groups, such as cleveland fes center, have been able to safely use percutaneous electrodes with individual patients for months and years at a time. one of the drawbacks of using the percutaneous electrodes is that they are prone to infection and special care has to be taken to prevent such events.