Medical implants with circuits treating periprosthetic joint infection and other sensing

The medical implant comprising:

• an implant component configured to be implanted in a patient;
• an electrode array comprising at least two electrodes spaced apart on the implant component;
• an energy storage device inside the implant component;
• and
• a power management unit inside the implant component and operative to control electrical stimulation of the electrode array by current supplied by the energy storage device to be at a level which at least reduces formation of a biofilm on at least part of the implant component while implanted in the patient,
• wherein the implant component comprises a tibial insert having a pair of tibial trays on an upper side adapted to guide rotational movement of a respective pair of femoral components of the medical implant, and having a tibial component on a lower side adapted to be cemented to a tibia of the patient,
• the first set of the electrodes of the electrode array are spaced apart on a side surface of the tibial insert;
• the second set of at least one of the electrodes comprises a centrally located electrode between the tibial trays;
• and
• the power management unit is operative to control current density through patient tissue between the first set of the electrodes and the centrally located electrode while electrically stimulated by the energy storage device.