A sensing bone fixing element includes a fixing portion, a fastening portion, a capacitor structure, and a coil. The fastening portion is fixed to the fixing portion and suitable for being fastened to a bone. The fastening portion passes through the capacitor structure which has a capacitance value and includes a first conductive layer, a second conductive layer, and an elastic dielectric layer. The first conductive layer leans against the fixing portion, the second conductive layer leans against the bone, and the elastic dielectric layer is located between the first conductive layer and the second conductive layer. The coil has an inductance value, and two ends of the coil are respectively connected to the first conductive layer and the second conductive layer. The coil receives a detection radio frequency (RF) signal and generates a responding RF signal according to variations in the capacitance value and the inductance value.
