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Radiological criteria for trochlear dysplasia in children and adolescents.
[trochlear dysplasia]
Trochlear
dysplasia
is
a
well-known
cause
for
recurrent
patellar
instability
.
Besides
clinical
findings
,
the
treatment
is
based
on
radiological
diagnostic
tools
.
In
adults
the
characteristics
of
trochlear
dysplasia
are
determined
by
magnetic
resonance
imaging
(
MRI
)
scans
as
well
as
on
true
lateral
radiographs
.
For
children
there
are
no
established
criteria
for
the
radiological
diagnosis
of
trochlear
dysplasia
.
This
study
was
designed
to
evaluate
if
typical
radiological
findings
of
trochlear
dysplasia
on
lateral
radiographs
in
adults
are
also
found
in
children
and
adolescents
with
open
growth
plates
.
We
analyzed
true
lateral
radiographs
of
children
and
adolescents
with
MRI-detected
trochlear
dysplasia
.
On
lateral
radiographs
three
factors
were
relevant
:
crossing
sign
(
deepest
part
of
the
trochlea
crosses
the
most
anterior
point
of
the
lateral
condyle
)
,
a
supratrochlear
spur
or
bump
(
bulge
of
the
proximal
trochlea
)
,
and
a
double
contour
(
due
to
a
hypoplastic
medial
condyle
)
.
In
all
patients
with
trochlear
dysplasia
at
least
one
typical
radiological
finding
usually
found
in
adults
could
be
documented
.
Only
true
lateral
radiographs
allow
the
diagnosis
of
trochlear
dysplasia
in
children
and
adolescents
with
open
physis
to
be
made
.
MRI
scans
on
a
regular
basis
are
,
therefore
,
not
mandatory
although
they
are
the
diagnostic
golden
standard
for
the
diagnosis
of
trochlear
dysplasia
.
Diseases
Validation
Diseases presenting
"this study was designed to evaluate if typical radiological findings of trochlear dysplasia on lateral radiographs in adults"
symptom
trochlear dysplasia
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