Hi Shawn
First, Dr. Ure is one of the best hip resurfacing surgeons in the US. You are in good hands. Whatever he suggests would be from the great amount of experience he has.
I know of a few people that had Leg Perthese, but am not sure there are any on my board here. There were on the Yahoo Hip Resurfacing Group.
http://groups.yahoo.com/group/surfacehippy/
They had sucessful hip resurfacings.
I am not sure about the new CT scan. I do know many of the newer hip resurfacing surgeons are using computer aided surgery. The really experienced pros place a hip more exact than the computer does, but not all doctor have done thousands of resurfacings. So the computer aided surgery does make sure your device is placed properly.
I am not sure what Dr. Ure is talking about is the same. I do know I would trust his judgement since he is a very experienced surgeon with many happy patients. The placement of the hip device is very important so I assume any tool that helps will also help ensure a better outcome.
Some people have had the cups that are screwed in or have prongs. Again, they are used for special cases because a slipped cup usually means a revision to a THR or a second surgery to place the cup again. So the doctor feels you need a special cup - by all means listen to him.
Normally if you have a lot of lingering questions about your doctor, you should get a second opinion. These questions thought, seem more technical rather than not having faith that Dr. Ure is a good surgeon.
It doesn't sound like he is suggesting anything unusual and is only trying to make sure you have the best outcome possible.
Keep in touch.
Pat