This is the simple way to look at it:
Another cut adds another risk element but the other cut, eg, segmental lefort could also add another 'pay off' (favorable) aesthetic or functional element.
As to the multi-segment lefort, risks are lower when an experienced doctor who does that a lot than one who is not so experienced.
Risks are combination of your personal risk factors and the doctors skill to mitigate risks and/or to be braced to address possible complications.
The short of it is risks that could specifically apply to you vs. the skill of the doctor to mitigate them should be a conversation with your doctor.
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If you want to read something that has all the scary risks and complications that have been documented as being associated with maxfax surgery, here is an article:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5342970/--------------------------------------------------
Here's the savvy way to look at it:
If you want to know the risks that your doctor wants you to accept in order to have the surgery, ask him for the LEGAL document he wants you to sign which lists all the risks. Ask BEFORE making your decision, take it home and read it and refer to it when having a conversation with your doctor.
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In closing, you want to know YOUR risks with YOUR selected doctor and the best way to be informed about that is WITH which ever doctor you choose.