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The role of trochlear dysplasia in patellofemoral instability.
[trochlear dysplasia]
Trochlear
dysplasia
is
characterized
by
abnormal
trochlear
morphology
and
a
shallow
groove
.
It
is
associated
with
recurrent
patellar
dislocation
,
but
it
is
unclear
whether
the
dysplasia
is
congenital
,
the
result
of
lateral
tracking
and
chronic
instability
,
or
caused
by
a
combination
of
factors
.
Lateral
radiographs
elucidate
the
crossing
sign
and
characteristic
trochlear
prominence
.
Recurrent
patellofemoral
instability
is
multifactorial
,
and
each
component
must
be
considered
in
determining
treatment
.
Managing
other
factors
associated
with
recurrent
instability
may
compensate
for
a
deficient
trochlea
and
provide
stability
.
Medial
patellofemoral
ligament
reconstruction
is
recommended
for
patellofemoral
instability
in
the
presence
of
trochlear
dysplasia
in
patients
without
patella
alta
or
increased
tibial
tubercle-trochlear
groove
distance
.
Trochleoplasty
should
be
reserved
for
severe
dysplasia
in
which
patellofemoral
stability
can
not
otherwise
be
obtained
.
Diseases
Validation
Diseases presenting
"chronic instability"
symptom
trochlear dysplasia
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