Interbody fusion system

An interbody spacer configured for implantation between spinal vertebrae, the interbody spacer comprising:

• electrical circuitry within an electronics housing of the interbody spacer;
• a plurality of load sensors spaced apart on carriers of the interbody spacer, the plurality of load sensors electrically connectable to the electrical circuitry and configured to
• receive power from the electrical circuitry, and
• provide to the electrical circuitry a load signal indicative of a measurement of force exerted onto the plurality of load sensors of the interbody spacer;
• and
• a plurality of electrodes spaced apart on a surface of the interbody spacer, the plurality of electrodes electrically connectable to the electrical circuitry and configured to
• receive power from the electrical circuitry, and
• at least one of
• provide to the electrical circuitry an electrode signal indicative of an impedance measurement indicating impedance of biological materials surrounding the plurality of electrodes or a presence of biofilm surrounding the plurality of electrodes, and
• generate an electrical field between at least two electrodes of the plurality of electrodes to electrically stimulate biological materials adjacent the at least two electrodes to a level which reduces biofilm or promotes bone growth,
• wherein the interbody spacer comprises an upper endplate, a lower endplate and an actuation mechanism configured to move the upper endplate and the lower endplate away from one another
• wherein the electrical circuitry within the electronics housing is configured to be removably attached to the interbody spacer through a screw that engages with a threaded hole of the interbody spacer.