Will scar tissue or thread from thread lift cause wavy skin after a facelift?

Having had a previous thread lift should not cause any problem with a subsequent performance of a facelift or cheeklift.  I have seen this situation, and the threads can easily be removed when they are encountered during the dissection.  Any scar tissue that may have formed around the threads is easily released and should not pose a problem.  Your new facial contours can be as smooth as you hoped for.

For unique cases where a variety of modalities could be used to treat the condition, I would suggest an in-person or virtual consultation to develop a custom and effective treatment plan. It is difficult to precisely define the best option without collecting the same information. I suggest reaching out to an expert for a consultation with surgical and non-surgical methods to get a comprehensive option. Best, Dr. Emer.

No, your previous thread lift would not mater. Case #0035 is a re-do in the link below. The pictures show her recovery and 2 yr follow up.  
There is always a risk of nerve injury with multiple procedures. Regarding the face, the incidence is very low. The video should help you understand more. 
Sincerely,

Michael Kulick MD

than6278 I appreciate your concern, however it is highly likely that the threads used in your thread lift were  dissolvable and should no longer be present. There may be some residual scar tissue from the threads, however an experienced plastic surgeon should be able to deal with the scarring. There should be no increased chances of nerve injury. Discuss all your concerns with the board certified plastic surgeon. Good luck.

so in the vast majority of cases, threads and all signs of their presence have gone by three years following insertion. Sadly, there is often very little sign that they were ever inserted even shortly after surgery. In my experience disappointment is high. If there is no signs of the threads now then it’s very unlikely they will be any pinching of the skin after a facelift. This would be the case for deep plane but also a superficial plane facelift. Nerve injury is a rare complication of any facelift operation and I don’t think any more likely In you. Ask your surgeon what is  incidence of nerve injury is for your reassurance. Hope that helps. Regards, Adam Goodwin.

This is the copy of my earlier response to your other question, "It should not be an issue, but better to use a Plastic Surgeon familiar with both Silhouette InstaLift and doing revision mini FLs. There are very few PSs whom fit that category."