Double cut in tibia (upper and lower) in one surgery

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I have find a doctor in China using pure external method with traditional frame.
What interests me is the bone cut way. The doctor cut tibia bone twice (upper and lower) and make upper and lower lengthening together, which also make the consolidation quicker.
Does anyone know about the double cut?



I am sorry English is not my first language. Thanks you.

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https://pan.baidu.com/s/14sdHLOMftYYzbojBeLKXmg

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As it is known to us, pure external is safer than Lon or Latn in tibia.
So do you think if keeping 1.0mm a day lengthening safe? and just let the consolidation period quicker for the gap is smaller both sides?
Thanks

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Thanks. As for 5-6cm pure external would be wearing 10-12months frame, Do you prefer pure external or Lon/Latn?