PCL threads placed a year ago usually do not prevent a deep plane facelift, but they can make the operation less straightforward. Threads may leave small areas of scar tissue or tethering, and your surgeon may encounter residual material or thicker tissue planes during dissection. The key is to tell your facelift surgeon exactly what type of threads were used, where they were placed, and when. If there is no ongoing inflammation, infection, tenderness, or unusual firmness, many surgeons would still proceed, sometimes with minor adjustments to the plan. I would avoid any additional threads before surgery and let the operating surgeon decide whether timing next month is appropriate after examining the areas where the threads were inserted.