[Computerized sonometry--use of a noninvasive procedure for evaluating stability after fractures]

Common techniques to assess the healing process of fractures are usually related to the experience of the clinician. However, standard x-rays allow only indirect conclusions on the stability of the healing bone. In addition to the radiological examination delayed union or non-union can only be diagnosed in the absence of specific changes such as callus formation. Computerised sonometry comprises the analysis of mechanical vibration as well as sound transmission during or after bone healing. This non-invasive method allows for assessing the stiffness of the bone quantitatively and gives objective data on bone stability.