What quotes/sentences from LL doctors are out there on risk of 5cm vs 6cm?

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What quotes?

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If you are referring to doctor's opinion in general (not specifically bound to just one patient  becsuse he has,  let's say,  osteoporosis)  this topic would be really useful.

Many people state "rigorously" that tibias should not lenghten 1mm more past 4 5 cm,  others past 5 cm and still others allow for 6 or 7cm according to each case. 20 years ago, 10 cm was the maximum target very common for many doctors.

So, what's the general guideline?

It can be also a percentage of original lenght, somebody say 20%, but I haven't seen this value on any scientific source so far.

I am talking about TIBIAS.