[Possibilities and limits of interpretation of muscle sonograms. An experimental study of standardized muscle injuries].

After sonographical examination we performed surgically an experimental muscle injury of known size and location on 28 New Zealand white rabbits by a stab with a scalpel into the supraspinatic muscle. The changes in the healing process were sonographically followed and documented for 2 months in short periods of time. The sonographically detectable changes during the healing process underlie a regularity. The changes in sonography can be explained by histopathology with respect to the theoretics of ultrasound physics. The development of a hematoma and of fibrous scars can be followed up by sonography with respect to some limits. Sonography is shown to be a supporting method of high value in the diagnosis of muscle injuries and with respect to certain limits in the follow-up of the healing process, too.