2. What is Bio-geometry ?
Integration of BIOLOGICAL and
GEOMETRICAL factors that govern the logic
involved in efficient
Selection
Siting
Design
Construction &
Transfer of a flap.
3. What is transposition flap ?
It is a rectangle / triangle / square of skin and
subcutaneous tissue that moves about a pivot
point into an immediately adjacent defects.
The flap donor site is closed by skin grafting,
direct suturing of the wound or a secondary
flap from the most lax skin at right angles to
the primary flap.
8. The classic flap geometry
Triangulating the defect:
Isosceles triangle
Right angle triangle
Selection depends on the orientation of the
soft tissues.The more angled the flap is
from the defect, the right angled triangle
is ideal as the flap has to move less.
9. II. Marking of the Pivot point
III. Flap marked.
Jack knife like lateral movement
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21. Advantage of the flap
Local flap
Easy technique
Redistribution and redirection of tension.
They tend to be smaller in size than
advancement and rotation flaps.
22. Disadvantage of the flap
In classic pattern, the donor site can’t be
closed primarily – needs grafting
Dog earing when one side of the flap is much
shorter than the other.
23. Note flap
Transposition flap designed as
a triangle with 50-60 degree
angle used to close an
adjacent circular defect.
Resembles a musical eight
note
To close circular defect upto 2
cm in size anywhere on the
head and neck.
24. The adjacent limb of the flap 1.5 times
diameter of the defect and parallel to a
Relaxed SkinTension Lines.
The second limb of the flap is equal to the
diameter of the defect.
The donor site is closed primarly.
25.
26. Sliding transposition flap
It’s a modification
where the defect is not
triangulated
Its made eliptical
The flap doesn’t extend
beyond the ellipse.
27.
28. Interpolation flap
Type of 2 stage tissue flap
The base of flap is not adjacent to the defect
Bridge of tissue present between flap base and
the defect.
The skin island has to be removed in 2nd stage
Used when the nearby skin to the defect has less
mobility while the neighboring skin to that has
mobility.