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Lateral patellar dislocation: mechanism of disease, radiographic presentation, and management.
[trochlear dysplasia]
Lateral
patellar
dislocation
is
a
common
injury
occurring
in
young
active
adults
.
The
mechanism
is
that
of
twisting
injury
to
the
knee
on
a
planted
foot
with
valgus
stress
.
Several
predisposing
factors
,
including
femoral
trochlear
dysplasia
,
patella
alta
,
and
lateralization
of
the
tibial
tuberosity
,
contribute
to
patellar
instability
and
lateral
patellar
dislocation
.
Magnetic
resonance
(
MR
)
imaging
of
the
knee
is
the
modality
of
choice
to
evaluate
underlying
bone
contusion
patterns
,
associated
soft
-tissue
injuries
,
and
additional
complex
ligamentous
and
osteochondral
injuries
,
many
of
which
are
not
apparent
on
conventional
radiographs
.
Diseases
Validation
Diseases presenting
"patellar dislocation"
symptom
achondroplasia
trochlear dysplasia
This symptom has already been validated