An 8 year old boy with lameness of the right lower extremity, of insidious presentation and one month of evolution. There is no history of trauma or constitutional signs. On examination there is evidence of restriction to passive mobilization of the limb, especially in abduction and internal rotation. Of the following statements all are true EXCEPT one:
The correct answer is 3. Perthes disease is more common and has a better prognosis in younger children.
It is advisable to perform a hip X-ray.
In transient synovitis the onset is usually acute.
In Legg-Calvé-Perthes disease the prognosis is worse the younger the age of onset.
The cause may be a hypercoagulable state.
The therapeutic option will vary depending on the degree of involvement.
Perthes disease is more common and has a better prognosis in younger children.