Ultrasonography in Perthes' disease. Clinical relevance and influence on treatment.

A detailed description of the ultrasonographic findings in the course of Perthes' disease has recently been evolved. Synovitis was a prominent finding in the early stages. Lateral extrusion of the femoral head and signs of healing were found earlier by ultrasonography than by radiography. This has clinical implications. Immobilisation in the acute phase was shown to decrease capsular distension, and treatment using containment can be started earlier. The findings in 25 hips were evaluated in this study and their influence on treatment is discussed.