The technique of transferring fat from one part of the body to
another - for example, from the tummy or buttocks to the face - has been
practiced for many years. However, for any tissue to survive it must have an
adequate supply of blood to the cells to keep it nourished. When blocks or
segments of fat are moved, it is impossible for enough blood vessels to grow
into the centre to keep the fat alive and so it tends to diminish in bulk
over time and eventually disappear or, less commonly, calcify (i.e. become
hard).
A better understanding of these issues has led to the development of a
technique known as “structural fat grafting”. This is based on the principle
that if very small quantities of fat are placed in individual tunnels,
building up layers for bulk, each fat cell will be closer to a nourishing
blood vessel, allowing capillaries to grow in to keep the fat alive. The fat
to be transferred is obtained by very gentle liposuction using a syringe
rather than a mechanical suction device so that the cells are not damaged.
The donor site is usually the tummy, thigh, knee or bottom. The fat is then
centrifuged to separate it from any oily fluid before being put into small
syringes and grafted using an injection technique into numerous tunnels with
specially designed blunt needles.
Indications This procedure is used most commonly in the face
to provide contour or bulk, though it has found a place, usually in
combination with liposuction, to contour other areas of the body such as the
buttocks. Facial tissues tend to lose bulk with the passage of time,
especially in the cheekbone area, the groove over the lower part of the eye
socket (tear trough) and the lips. Structural fat grafting can be used,
either alone or combined with other procedures such as facelift, or
blepharoplasty (eyelid surgery), to improve contour and so rejuvenate these
facial regions.
Limitations The creation of the numerous tunnels necessary
for successful fat grafting can cause considerable swelling and bruising,
particularly in the lips, which will take two to three weeks to subside.
There will also be a little bruising at the site from which the fat was
taken. However much care is taken, it is impossible to accurately predict
exactly how much fat will survive but most estimates are put at between 50%
and 70%.
If, following the operation, a deal of weight is gained then the
transferred fat will increase in size just as fat cells elsewhere in the
body will. Sometimes there may be irregularities in the treated areas - this
is more likely in areas where the skin is thin, such as beneath the lower
eyelids, and very occasionally a small surgical procedure may be necessary
to correct it. |