Importance of Permanent Donor Zone in Hair Transplant
In simple words donor zone is the area from where the tissue is being borrowed for placement in another location. In hair transplant this is a ribbon shaped area centered over a bony prominence in the skull called occipital protuberance. This area described as "Universal Safe Zone" forms the basis of hair restoration surgeries. It extends from the area around ear going back towards temples over to the occipital protuberance and is best seen in Norwood VII patients. Norwood VII is the "Universal Safe Zone" for scalp hair. The height of donor area is around 5-6 cm in midline and it is approximately 30-35 cm long. If we were to utilise all of it there would be no hair left in the donor zone of a class VII patient. However, it is possible to utilise around 50% of this hair without a visible reduction in hair density on the back. This means a total usable area of around 90-100 square cms. Assuming an average density of 100 FUs /cm squ...