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[Value of ultrasound in differential diagnosis of pediatric hip joint effusion (Perthes disease, C. fugax, epiphysiolysis coapitis femoris].

UNLABELLED
Hip pain during infancy is frequently harmless by nature and hardly demands any therapeutic intervention. A careful differential diagnosis is of great importance.


AIM
In our study we attempted to evaluate the significance of sonography as a non-radiant and economical aid in the differential diagnosis of hip diseases during infancy.


METHODS
The study population consisted of children aged from 2 to 14 years, who visited our clinic with hip complaints and evident capsular distension (more than 2 mm compared to the contralateral hip joint) and without preceeding diagnosis. The study period was from 1988 to 1995. From the 82 children enrolled in this study we diagnosed Coxitis fugax (n = 54), Morbus Perthes (n = 19), Epiphysiolysis capitis femoris (n = 5), rheumatic Arthritis (n = 2), septic Arthritis (n = 1) and femoral Osteoid-Osteoma (n = 1). All patients with Coxitis fugax were scheduled for clinical and sonographic re-examination.


RESULTS
Coxitis fugax is the most frequent disease of the hip during infancy. Perthes disease is the most important differential diagnosis up to the age of 10 years. Epiphysiolysis capitis femoris and rheumatic diseases proved to be most common differential diagnosis among elderly children. As a result of our study we were able to establish a diagnostic algorithm of hip diseases during infancy. Sonographic examination proves to be of great value especially in the differential diagnosis of Coxitis fugax and M. Perthes. In many cases the X-ray examinations which were previously mandatory could even be dispensed with.


RELEVANCE
Although this concept requires careful supervision of the patients, it spares 60% of the children from undergoing X-ray examinations or MRI.