Femur lengthening and flexibility

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I read somewhere that Dr pailey checks for patients flexibility before the surgery, and he wouldn't do the surgery to someone who's flexibility is really lacking due to little muscle reserve.
I'm actually really not flexibile in my hamstring and most hip muscles (too many years of sitting).

Regarding stretching and improving flexibility, I heard pailey says he doesn't believe in it because muscle returns to it's basic condition after few days of not stretching.

So my question is for femur lengtheners, how is your recovery in terms of hip mobility (duck ass) and how much of permanent issues is a real thing?

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I don't think it has anything to do with LON, it's just a matter of muscles being elongated and it happens anyway regardless of the method.
Also Paley does only precice and he said he might rule out patients with very low flexibility.

I was wondering if there are any patients who did femur and were not so flexible before the surgery, how it was for them and how long it took them to recover to restore normal gait