Determination of the relative stiffness of an implant within the bone via attachment of a resonance frequency transducer containing two piezoceramic elements to an implant. One piezo element is excited by an electrical signal, and the resulting vibration is measured by the second element. The higher the resulting frequency (in kHz), the stiffer the implant‐to‐bone connection. The device records the resonance frequency arising from the implant–bone interface (change in amplitude over induced frequency band).