A study of some innovations in hair transplanting.

The value of 1) cooling of plugs to induce a shorter "resting phase", 2) power-driven punches to produce a greater yield of hair per graft; and 3) larger grafts to produce a greater yield of hair has been studied. Cooling does not appear to shorten the "resting phase." Power-driven punches produce an insignificant increase in the number of hairs yielded per graft. Using larger "standard" grafts does not lead to an increased yield of hair per graft and results in an overall decrease in yield from donor areas.