From many dairy, I find Precice patients use many painkiller like Tramadol everyday during lengthenning. And if don't use painkiller the pain would be like hell.
Patients of Paley could only get 10days painkiller for the painkiller management of the government and some of they could not bear without painkiller.

But I find fitbone patient do not show that pain.

What makes the difference?
Does 6-8mm size fitbone  vs   10.7mm precice or 10mm stryde matters?