This hair loss question was answered by Dr. Glenn Charles of Florida who is a member of the Coalition of Independent Hair Restoration Physicians. His professional answer is below.
I went to a local hair transplant doctor for a consult and he mentioned that he uses a 2-3 bladed knife with the Haber spreader to insure that no transection occurs. He said that there is less transection with that than with the single bladed knife, when used properly. According to him, with the single blade, you must go down 2-3 times as deep to cut past the follicles, and if you are not right on target there will be some transection. Does this sound correct? Does using a Haber spreader with a 2-3 bladed knife sound right?
The Haber spreader can be very useful and help to minimize transection of follicles during donor strip removal in surgical hair restoration. However, I think it works best when using a single blade to make the initial scoring incision followed by the Haber spreader. You do not have to go deeper just because a single blade is used. I see no advantage in using 2-3 blades. In fact, most view it only as a way to speed up the process which may not always be good for the patient.
Dr. Glenn Charles, D.O.