The bone - soft tissue interface is highly reflective seen as a bright white line with acoustic shadowing deep to the interface. The inability to image the medullary cavity of bone using pulse-echo ultrasound had led to misconception that it is not well suited for evaluation of bone. However the highly reflectivity of cortical bone and the tomographic nature of ultrasound imaging makes it ideal for evaluation of bony contour.
The sonographic principles in evaluation of healing of callus is, that once there is a cortical breach, the intervening gap is filled with hypoechoic granulation tissue which is sonographically accessible to evaluation with greater accuracy and sensitivity. Grey scale B-mode scanning , Colour doppler USG have both been used in the assessment and follow-up of bone healing (Calliadi ctal 1993, Moed et al 1995) Tissue harmonies with added 3-D studies have only…
