[Assessment, reproducibility and sources of error in sonographic examination of the hip].

To the sonographic examination of the hip middle-category devices with real-time working and 5 MHz linear probing heads are necessary. Special laying and documentation is suggested to the rapid and easy execution and assessment of the examinations. If the examination is carried out in a standard plane the points of orientation characterising the acetabulum are represented unequivocally and clearly, the results gained can be reproduced and compared.