The problems that can arise from any strip surgery performed worldwide are as follows.
1. Cosmetically unacceptable width. Linear strip scars are largely unpredictable with regards to the width of the final healing. Typically, if performed correctly, a linear donor scar will range in width from 1mm to 3mm. Linear donor scars rarely remain the same width along their entire length as most hair transplant results from strip will have scars seeing a variance of 1mm to 3mm from one end to the other.
2. Cosmetically unacceptable length. One of the developments in the field of hair restoration was the reduction of donor strip width by elongating the strip further. This allows the surgeon to harvest just as much hair bearing tissue without compromising the laxity of the donor zone by taking a strip that is too wide. The compromise is that some surgeons will go too far with some venturing into the temple region.
3. Donor area shock loss. This is usually a temporary condition but in some cases it can be permanent. This is due to donor strip harvesting techniques that cause too much transection of follicles. It can also be created by taking a donor strip that is too wide, particularly in the mastoid processes of the occipital donor region. Imagine your head as a square box. The mastoid processes are the two back corners of the scalp. These two areas traditionally have the highest natural levels of tension. Experiences hair restoration surgeons know to narrow the donor strip in this region but when trying to gain large super megasession numbers of grafts doctors can still take the strip too wide from this area. This creates a level of tension and pressure that restricts blood flow to these regions so much that the hair in these regions will fall out and not grow back.
4. Nerve damage. All strip surgeries will result in some degree of nerve damage but when performed properly these nerves will repair themselves and regrow new connections to the nerves they were separated from. In some cases however the nerve damage is too severe or the scar tissue to too dense to allow these nerves to reconnect. This results in permanent numbness in the donor zone and into the crown region.