Transection Rates (T Rate) in Hair Transplantation Surgery (HTS) is a very important concept.
The T Rate is the percentage of damaged or transected hairs compared to the total number of hairs in a sample.
The T Rate determines the potential yield of transplanted hairs.
Hair yields and future coverage are also determined by the number of hairs displaced, or the Calculated Density .
The Calculated Density is the number of hairs in one follicle.
The T Rate and Calculated Density allow for an objective measure of outcomes and method to correct and improve techniques.
Therefore, any new technique in HTS must be assessed by these two parameters to show validity for broad use.
Upon removal of the graft, both the number of hairs in each follicular unit and the number of transected hairs in those follicles were counted and recorded.A low transection rate
A high calculated density
Which will potentially maximize patient hair yield.
The above statement validates the use of this technique to a large extent for increasing patient care.
We just need a good training program (patience, dexterity, IHTI, etc.), the appropriate tools (magnification, depth control, punch size, etc.) and consistency to benefit from the advantages of this breakthrough technique such as:
Counts were limited to the first hundred harvested grafts.
Stereoscopic microscope at high power magnification (20x) used.
Total number of hairs calculated by simple addition.
We repeated the same process for the number of transected hairs.
The T Rate = transected hairs/total number of hairs
The Calculated Density (CD)= total number of hairs/100 follicular units.
A camera mounted on the microscope was used to confirm the accuracy of the counts.
