Tissue expansion is a technique used by plastic and restorative surgeons to cause the body to grow additional skin, bone or other tissues. Skin expansion is a common surgical procedure to grow extra skin through
controlled mechanical overstretch.It creates skin that matches the
color, texture, and thickness of the surrounding tissue, while
minimizing scars and risk of rejection. When skin is stretched beyond its physiological limit mechanotransduction pathways are activated. This leads to cell growth as well as to the formation of new cells. In some cases, this
may be accomplished by the implantation of inflatable balloons under the
skin (see figure). By far the most common method, the surgeon inserts
the inflatable expander beneath the skin and periodically, over weeks or
months, injects a saline
solution to slowly stretch the overlaying skin. The growth of tissue is
permanent, but will retract to some degree when the expander is
removed.
Info taken from Wikipedia
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