“…Mechanical impedance, natural frequency, vibration analysis, stress wave propagation, ultrasonic-measurements, impact response technique, electrical potential measurements and mechanical tissue response analysis are some of the techniques, which have been attempted by different investigators for the assessment of in vivo bone condition in the past [30,31,32,33,34,35,36,37,38,39,40]. However, in all these studies, the intervening soft tissues, whose quantity and quality changes with individual to individual, affected the results.…”