Why some surgeon allow for unsafe amounts?

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I am seeing one doctor who have patients with 11+ femur, 8+ cm tibia etc.

I thought 8cm femur and 5cm tibia were upper bound for safe length.

Some of his patients do 20 cm in two surgery. This can’t be safe to make, no?

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It really depends on the patient. Betz had a 19 year old male athlete do 12cm on femurs and recovered very well. I'm 29, and not an athlete, so I'm having trouble with 10cm on femurs. Most reach their tibia limit at 6.5/7cm, but again if you're a young athlete, 8cm is doable.

The limit is different for everyone. I know some 50 year old men who took 4 month to only do 7cm on femurs.

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Quote from: SirStretchAlot on September 18, 2021, 10:39:22 PMIt really depends on the patient. Betz had a 19 year old male athlete do 12cm on femurs and recovered very well. I'm 29, and not an athlete, so I'm having trouble with 10cm on femurs. Most reach their tibia limit at 6.5/7cm, but again if you're a young athlete, 8cm is doable.

The limit is different for everyone. I know some 50 year old men who took 4 month to only do 7cm on femurs.

Noone will recover well from 12cm in femurs.
That 19yo you said is f@cked for life and he will find it out for sure in less than 10 years.

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Quote from: SirStretchAlot on September 18, 2021, 10:39:22 PMIt really depends on the patient. Betz had a 19 year old male athlete do 12cm on femurs and recovered very well. I'm 29, and not an athlete, so I'm having trouble with 10cm on femurs. Most reach their tibia limit at 6.5/7cm, but again if you're a young athlete, 8cm is doable.

The limit is different for everyone. I know some 50 year old men who took 4 month to only do 7cm on femurs.

Yes but the issue is not the amount done but the safety.

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Again, I'm assuming safety means recoverability, or the likihood that you're not going to end up a cripple?

It completely depends on your age and muscle elasticity. Everyone is different. A couch potato old man, would end up with life-long problems lengthening 6cm, while a young athlete would not have problems lengthening 11cm.

8cm on Precise and Stryde are manufacturer preferences. The nails themselves become more prone to bending as they extend as well. How much you lengthen depends on how fit and young you are, and how your legs themselves feel at different lengths.

I personally had no problems lengthening until 9cm. From 9.5cm-10cm, I knew my legs were at their limit.

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Quote from: SirStretchAlot on September 20, 2021, 06:42:30 PMI personally had no problems lengthening until 9cm. From 9.5cm-10cm, I knew my legs were at their limit.

Interesting, consistent with my experience.  When I hit 8cm I didn’t feel like I was anywhere near my real limit, definitely could have hit 10cm if my nail allowed it.  My knee extension was 0 degrees even at full extension.  Probably for the best I didn’t attempt more than 8cm at once, though.  To me everything after 4cm felt the same. 

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Safety limits are set according to patients ability to regain their athletic capacity after surgery. Although the lengthening limit varies according to the genetic structure of the person, I am almost sure that people who lengthen 10 cm or more will walk like a robot (if it is called walking). If anyone lengthening 10cm or more and can run normally even if not as much as before the surgery, please share the video link and surprise me.

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Quote from: Atomic on September 20, 2021, 09:54:00 PMSafety limits are set according to patients ability to regain their athletic capacity after surgery. Although the lengthening limit varies according to the genetic structure of the person, I am almost sure that people who lengthen 10 cm or more will walk like a robot (if it is called walking). If anyone lengthening 10cm or more and can run normally even if not as much as before the surgery, please share the video link and surprise me.

Depends if 10 cm is in two segments or just in one, 10 cm in both segments is not that much actually.

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Quote from: Thehighest on September 20, 2021, 10:04:51 PMDepends if 10 cm is in two segments or just in one, 10 cm in both segments is not that much actually.

Yes, a total of 10 cm is an ideal amount of lengthening for two segments. Even 14-15 cm can be reached for two segments. I was talking about the femur. For the femur, greater than 8 cm is a high-risk area and recovery of athletic capacity becomes very difficult. It is out of the question for the 10 cm tibia region alone. People who want to extend their tibia by 10 cm can say goodbye to their peroneal nerves.

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Quote from: Atomic on September 20, 2021, 10:40:39 PMYes, a total of 10 cm is an ideal amount of lengthening for two segments. Even 14-15 cm can be reached for two segments. I was talking about the femur. For the femur, greater than 8 cm is a high-risk area and recovery of athletic capacity becomes very difficult. It is out of the question for the 10 cm tibia region alone. People who want to extend their tibia by 10 cm can say goodbye to their peroneal nerves.

There is no research around "8cm" being the limit from where risks become higher. It could be 7cm or 9cm. The 8cm number just came from the limit that Nuasive products allow. It carries no meaning.

I met a Betz patient who walked perfectly fine at 10cm on femurs. He is on his school's basketball team. When my gait recovers, I'll take a video too. As for athletic ability, any LLer should expect incremental decrease in performance for every cm they lengthen.

There is not a single number like 8cm or 10cm, especially given the diversity of people on this forum. 10cm is easy for a 20-year old male athlete while 8cm is near impossible for a 50-year old house wife. It's a continuous spectrum that depends on your age, gender and fitness.