Mr. David Moore:

We tend to look at the trend of what the X-rays look like. It depends on the risk factors and the original diagnosis. If the hip was dislocated when very underdeveloped, you would keep an eye on them longer and would not take just one measurement. If it has never really been a concern and it was just a case that somebody thought there was something there, you might discharge them with one X-ray measurement, if it is normal obviously.