170cm starting height pursue for more than 6.5cm lengthen in tibia

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I learned that many LLers in East Asia or Southeast Asia ,they have lengthened the tibia a lot(like 170cm lengthen 8cm tibia ,usually with an economical method LON). I see that most of the forums suggest that 6cm or 6.5cm is the limit of tibia, why is there such a big difference？Maybe LL is not very normative in third world countries？Are there any racial differences like asians are more likely to lengthen the tibia？Or other reasons？
I'm a 170cm East Asian male, very slender, skinny type，plan to lengthen the tibia by 6.5cm.I don't usually like to exercise, my exercise requirement is just jogging，so I don't have high demands on athletic ability.Can I go for more than 6.5cm?like 7cm or 7.5cm?

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Quote from: ilovescience on June 15, 2022, 04:27:59 AMI thought 8 cm is the safe limit based on the diary video I saw on YouTube. Maybe I got it wrong I don't know.

Are you doing LL in Asia? Where are you now? If I were you I would consider Korea first and try to reach Dr.Lee!

Thank you.Live in China.Haven't decided which country to undergo LL surgery.

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Quote from: ilovescience on June 15, 2022, 05:06:07 AM您好啊！看得懂中文嗎？

当然，我敢说你不是中国人哈哈哈，这个问候方式不太中国。

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I read some posts from Sweden and medium water ,they has some long term complications with 7cm and 7.5cm tibia LL and I now think I shouldn't blindly pursue more extensions. My current goal is 6.5cm tibia, which a bit more than the 5~6cm tibia that many forum users recommended.
 If time and finances permit after many years, if I still have the will, I will do femoral lengthening, but this event has a small probability.