Dysplasia epiphysealis capitis femoris: Meyer dysplasia.

The clinical importance of dysplasia epiphysealis capitis femoris (Meyer dysplasia) is that it is easily mistaken for Legg-Calve-Perthes disease, leading to unnecessary diagnostic procedures and treatments. After a review of 578 children (619 hips) with Legg-Calve-Perthes disease, 17 children (27 hips) in whom both the clinical and radiologic pattern was obviously different could be found and a diagnosis of dysplasia epiphysealis capitis femoris was finally made. The mean age was 2.5 (range 1.9-3.6) years. There were 16 boys and 1 girl. Ten children had bilateral involvement (59%). The capital femoral epiphysis was delayed or was smaller in 26 hips, separated or cracked in 15, and cystic in 6. A normal bone structure was established in approximately 2 to 4 years. The final results assessed by the Mose and the Stulberg classification were good in all 27 hips. This study suggests guidelines for evaluating this rare condition based on the authors' findings and a review of the literature.