What is the probability of skin necrosis if I want to do facelift surgery after head and neck radiotherapy?

High. Radiation causes a permanent vasculitis that impairs the circulation to the skin. If you undermine that skin as in a facelift, the skin may die from inadequate blood supply.One could consider other treatments, such as fat grafting to restore volume to the aging face. This may also improve the quality and texture of the skin appearance, as stem cells exert their effect.Consider non-invasive treatments that restore volume. Should any procedure be done, it would have to be a highly modified facelift with limited skin undermining. 

Is impossible to comment on your specific situation. However, radiation creates a progressive decrease in blood flow to the skin which influences wound healing. You should pursue a facelift only with a plastic surgeon familiar with the aesthetic operation as well as head and neck cancer.

Hello,There are too many variables to address your question with a big degree of reliability.  Things to consider are - location of the radiation, how long after your radiation treatment are you, how much radiation was provided, your age, underlying medical conditions...I can expound more but as you can see, there is no easy answer without more information from you.  

The risk of necrosis after radiation is high. I would not recommend a facelift for you. You will only be flirting with disaster

This is a very difficult question to answer without knowing where you were irradiated and when.  Very often after neck irradiation to eradicate disease in the lymph nodes, the neck can have a very firm, wood -like hardness.  If that's the case, I likely would not perform a face and neck lift at all due to the scarred tissue planes and lack of pliability of the tissues.  On the other hand, if you had cancer of the nasopharynx for example localized to that area, the neck and skin could have been spared.  You should check with your head and neck surgeon and radiation oncologist to be sure.  Best of luck.