Conventional radiography is the widely accepted diagnostic method in patients after the sternal trauma, but the fracture cannot always be detected. Sonography, that is not able to demonstrate deeper portions of the bone, allows imaging its cortex proximal to the transducer as an intense hyperechoic interface with distal shadowing. Its disruption as a result of the trauma can be well seen, especially in flat bones. Authors present three cases, in which sonography made with a linear 7.5 MHz transducer allowed to reveal a sternal fracture in two patients and to exclude it in another patient, what couldn't be diagnosed on the lateral chest radiograms. Authors suggest using sonography in patients after the sternal fracture, not only with negative radiography.