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3D representation of the surface topography of normal and dysplastic trochlea using MRI.
[trochlear dysplasia]
The
three
-dimensional
(
3
D
)
image
of
the
articular
surface
topography
of
the
normal
and
the
dysplastic
trochlea
has
not
been
defined
.
The
aim
of
this
study
was
to
represent
both
the
normal
and
dysplastic
trochlear
geometry
in
3
D
using
magnetic
resonance
imaging
(
MRI
)
.
Using
the
segmentation
software
program
Amira
(
Mercury
Computer
Systems
,
Inc
.
,
Chelmsford
,
USA
)
we
created
3
D
reconstructions
of
the
distal
femur
bone
and
cartilage
using
MRI
scans
.
Bone
and
cartilage
of
the
distal
femur
were
traced
slice
by
slice
in
the
acquisitioned
dimension
while
the
Amira
program
reconstructed
the
3
D
model
.
This
model
was
then
transferred
to
the
Rhinoceros
4
.
0
software
(
Robert
McNeel
&
Associates
,
Seattle
,
USA
)
for
measuring
.
Using
this
system
a
non-invasive
3
D
representation
of
the
articular
cartilage
and
bone
of
the
normal
trochlea
and
depiction
of
different
types
of
trochlear
dysplasia
were
possible
.
Potential
advantages
of
these
MRI
measurements
are
assessment
of
the
3
D
articular
cartilage
of
the
whole
trochlea
and
the
bony
contours
on
the
same
image
,
no
imaging
errors
from
joint
malpositioning
,
no
ionizing
radiation
,
precise
preoperative
planning
according
to
the
documented
pathomorphology
,
and
comparison
between
the
preoperative
and
the
postoperative
shapes
.
The
disadvantages
include
higher
costs
compared
to
radiography
or
CT
scans
,
and
time
consuming
reconstruction
,
making
them
currently
a
research
tool
.
Diseases
Validation
Diseases presenting
"dysplastic trochlea"
symptom
trochlear dysplasia
You can validate or delete this automatically detected symptom
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