11 research outputs found
A STUDY ON STRUCTURE AND THICKNESS OF ISTHMUS OF CARTILAG E OF PINNA
INTRODUCTION:
A
variety
of
organic
and
inorganic
materials
is
used
as
grafts
in
Ossiculoplasty
and
reconstruction
of
the
outer
attic
wall
and
posterior
wall
of
External
Auditory
Meatus.
Tragal
cartilage,
Conchal
cartilage
and
septal
cartilages
are
frequently
used
as
auto
grafts
during
Tympanoplasty
surgery
for
reconstruction
of
Ossicular
chain.
Cartilage
grafts
used
for
Ossicular
replacement
should
be
thick,
sturdy,
easily
sculpted
and
without
much
elasticity.
If
the
graft
has
elastic
nature
it
tends
to
reduce
the
conduction
of
sound
vibrations.
Auricular
cartilage
is
accessible
through
the
same
post
aural
incision
used
for
the
mastoid
surgery.
If
the
auricular
cartilage
is
palpated
for
the
thickness,
one
would
find
that
the
thickest
part
is
the
isthmus.
It
is
felt
below
and
posterior
to
the
inter
tragal
sulcus.
The
present
study
is
to
measure
the
thickness
of
the
isthmus
part
of
the
auricle
cartilage.
It
also
includes
study
of
histology
of
the
cartilage
of
isthmus
to
observe
the
stacks
of
cells
present
between
the
two
layers
of
the
perichondrium.
MATERIALS
AND
METHODS:
The
cartilage
of
isthmus
from
36
cadavers
is
dissected
to
measure
its
thickness
and
for
histology
study.
Cartilage
of
isthmus
from
36
patients
undergoing
Modified
Radical
Mastoidectomy
is
measured
for
their
thickness
and
histology
is
studied.
A
sterile
steel
calipers
is
used
to
measure
the
thickness
of
the
cartilage,
after
exposing
the
cartilage
from
posterior
aspect
during
surgery.
The
tips
of
the
calipers
are
kept
touching
the
perichondrium
on
both
sides.
Thin
histology
sections
are
taken
after
embedding
the
cartilage
in
paraffin
moulds.
Hematoxyline
and
Eosin
stain
is
used
to
study
the
histology.
The
thickest
portion
of
the
cartilage
is
sculpted
to
be
used
as
a
strut
in
Type
III
Tympanoplasty.
OBSERVATIONS:
The
thickness
of
the
cartilage
varied
from
2.1
to
3mm.
The
number
of
stacks
of
chondrocytes
varied
from
5
to
7.
The
physical
nature
of
the
cartilage
is
sturdy
and
easily
sculpted.
CONCLUSIONS:
Cartilage
of
the
isthmus
of
the
auricle
is
accessible
through
the
same
post
aural
incision
used
for
Mastoid
surgery.
The
thickness
and
sturdiness
is
suitable
for
use
as
an
Ossicular
replacement
strut