Failure Rate of Graft Extraction in FUE

In FUE / FIT — Minimally Invasive Hair Transplants you said: “One tool worked consistently at 100%, while others methods had failure rates in the same patient ranging from 90-20%.”

Is that a typo (should it be 9-20%), or is it really 90-20%? Also by “failure”, do you mean failure to extract the graft, or failure for the graft to grow?
Thanks

My focus here was on the various tools that produce different results in different patients during the harvesting process. What I was doing was counting hairs that were successfully harvested with each tool I was using and keeping track of the hairs that failed to be harvested. One tool in the particular referenced patient produced 100% successful harvesting, while other tools caused more hair loss during the harvesting process. The problem that I was sharing was that one tool does not always work the same in every patient, so there is a great art in the harvesting process for FUE and the surgeon must be aware of all approaches to determine what works best for each patient. Still, with that said, not every patient is a candidate for FUE for either technical reasons (10% are not candidates) or for indications, matching expectations with reality, desires, budgets and the number of grafts needed to accomplish objectives.