Rare Diseases Symptoms Automatic Extraction
Home
A random Abstract
Our Project
Our Team
Evaluation of trochlear dysplasia using MRI: correlation between the classification system of Dejour and objective parameters of trochlear dysplasia.
[trochlear dysplasia]
Trochlear
dysplasia
is
considered
to
be
one
of
the
major
factors
causing
patellofemoral
instability
(
PFI
)
.
Dejour
's
classification
is
widely
used
to
assess
the
severity
of
trochlear
dysplasia
.
Additionally
,
in
current
literature
,
different
quantitative
parameters
are
recommended
to
distinguish
between
a
normal
trochlea
and
a
dysplastic
trochlea
.
In
order
to
achieve
a
more
objective
evaluation
of
the
trochlea
,
the
aim
of
this
study
was
to
evaluate
whether
specific
measurements
of
the
femoral
trochlea
can
be
assigned
to
the
qualitative
classification
system
of
Dejour
.
Transverse
MRI
T
2
-
weighted
scans
of
80
knees
with
symptomatic
PFI
and
varying
severity
of
trochlear
dysplasia
were
classified
according
to
Dejour
(
type
A
to
D
)
.
For
all
MRI
scans
,
quantitative
measurements
with
parameters
as
described
in
the
literature
were
applied
.
The
values
were
then
allocated
to
Dejour
's
classification
.
In
addition
to
the
four
-grade
analysis
,
two
-grade
analysis
was
also
performed
(
Dejour
type
A
against
type
BCD
)
.
Dependent
on
the
cut-off
values
,
specificity
,
sensitivity
and
Youden
index
for
each
parameter
was
defined
.
The
allocation
resulted
in
the
following
distribution
:
type
A
trochlear
dysplasia
n
=
25
,
type
B
n
=
23
,
type
C
n
=
18
and
type
D
n
=
14
.
In
descriptive
statistics
,
none
of
the
measurements
proposed
in
the
literature
could
be
assigned
to
the
four
-grade
classification
system
of
Dejour
.
For
the
two
-grade
analysis
at
the
cut-off
,
sensitivity
ranged
from
75
to
86
%
and
specificity
from
76
to
84
%
for
lateral
trochlear
inclination
,
trochlear
facet
asymmetry
and
depth
of
trochlear
groove
.
All
other
measurements
showed
a
poor
sensitivity
ranging
from
49
to
67
%
and
specificity
from
40
to
72
%
.
Interobserver
and
intraobserver
repeatability
for
the
measured
parameters
was
fair
to
moderate
(
ICC
values
0
.
34
-
0
.
58
)
in
high
-grade
dysplasia
(
type
BCD
)
and
substantial
to
almost
perfect
(
ICC
values
0
.
71
-
0
.
88
)
in
low
-grade
trochlear
dysplasia
(
type
A
)
.
Quantitative
measurements
of
the
femoral
trochlea
have
shown
to
be
of
limited
value
for
the
assessment
of
trochlear
dysplasia
.
None
of
the
quantitative
measurements
of
the
trochlea
on
transverse
images
could
be
assigned
to
the
four
-grade
descriptive
classification
of
trochlear
dysplasia
of
Dejour
.
Additionally
,
measurements
could
not
be
reliably
performed
in
high
-grade
trochlear
dysplasia
.
However
,
trochlear
inclination
,
trochlear
facet
asymmetry
and
depth
of
trochlear
groove
may
help
to
distinguish
between
low
-grade
and
high
-grade
dysplasia
.
Diseases
Validation
Diseases presenting
"limited value for the assessment"
symptom
trochlear dysplasia
You can validate or delete this automatically detected symptom
Validate the Symptom
Delete the Symptom