What's the safe limit for femur lengthening?

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Hey there.

I was wondering what the safe limit for femur lengthening is, just like for tibia it's 5 cm, any ideas?

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This was discussed a while ago, but this website is constantly getting new members.

Doctors prefer to base safe lengthening measures based on the bone length. For the femurs, 30% additional is the max. However, over 20% and the bone regenerate quality usually starts to decrease. So 20% max for the femurs is often recommended.

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I'd say 7 cm, 7.5cm max. It depends on the individual, for me it's 7cm. Some people would say 5 for the max recovery, some'd say 6; I say 7.

5 is for the maxEST recovery
7 is still in the safe zone but it might worsen your bio-mechanics. I think 5 cm won't hurt anyone (on femurs). But 7 is still safe.

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8cm is very common and pretty safe with an illiotibial band release. The less you go the better the recovery obviously. But plenty of people do 8cm no problem. So in this equivalence, 8cm for Femurs is like 5cm for Tibias.

To determine the safe limits for femur, just use the PRECICE nails mechanical limits for guidelines.

Tibial nail: 5cm (we alrdy established that it can do more but Achilles tendon gets buttraped as OP knows)
Femoral nail: 8cm (mechanical limit)

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Quote from: ghkid2019 on September 22, 2020, 07:48:34 PMTo determine the safe limits, just use the PRECICE nails mechanical limits for guidelines.

Tibial nail: 5cm
Femoral nail: 8cm

This.
And safe limits are <= 15% of your bone-length.

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Dunno why I included tibial nail in there. Both are 8cm mech limit but I should have referred femur only, as that's wat is relevant. My bad

And yeah ,15% of bone length is safe, any more and expect to be riskier. So it is ironic but a taller person doing CLL is actually safer than a shorter person. It's ironic but it is what it is-donald j trump

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From what ive read below 7 or 8 cm seems to have good safety

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I don't think it's necessarily "unsafe" to do 8 cm if your doctor signs off on it. However, you might lose more athletic function than with 5 cm. Personally I'm okay with that though, so I'm shooting for 8 cm.

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Alot of veterans say 8cm is hard but its worth it in my eyes and when they say that I think they mean in terms of recovery time. So of course if you do 5cm inches its going to go by a lot quicker. An extra year of regenerating is worth it to me and most others

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Quote from: ghkid2019 on September 22, 2020, 09:01:31 PMDunno why I included tibial nail in there. Both are 8cm mech limit but I should have referred femur only, as that's wat is relevant. My bad

And yeah ,15% of bone length is safe, any more and expect to be riskier. So it is ironic but a taller person doing CLL is actually safer than a shorter person. It's ironic but it is what it is-donald j trump

Then why do you keep saying limit of 5cm for tibia then going to say 15% is safe?