A: Great question. You are not giving me quite enough information to answer your question specifically, so I will answer in more general terms. If your donor hair supply was not good enough to do FUT (i.e. you have too little donor hair and too much bald area to cover) then most likely you will not be a candidate for FUE either, since both procedures require, and use up, donor hair. That said, if don’t need that much donor hair, but the nature of your donor area is such that a linear FUT scar might be visible then FUE might be useful.
An example would be the case in which a person has limited hair loss in the front of his scalp, has relatively low donor density, and wants to keep his hair on the short sides. In this case, FUT would not be appropriate as you might see the line scar, but we might be able to harvest enough hair through FUE to make the procedure cosmetically worthwhile. Remember, with low density neither procedure will yield that much hair to be used in the recipient area.
Another example is an Asian whose hair emerges perpendicular from the scalp so that a line incision is difficult to hide, i.e. the hair will not lie naturally over it. A third example is where the patient’s scalp is very tight. In this case, the donor density might be adequate, but it would just be hard to access it using a strip FUT procedure. In this case, FUE would also be appropriate.
From these situations, one can see that the decision to perform FUE vs FUT, or even a hair transplant at all, can be quite nuanced and requires a careful evaluation by a hair restoration surgeon with expertise in both procedures.