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Recurrent dislocation of the patella accompanying hypotrochlea of the femur and malalignment of the patella.
[trochlear dysplasia]
This
case
report
describes
a
rare
case
of
recurrent
dislocation
of
the
patella
which
was
accompanied
with
trochlear
dysplasia
and
malalignment
of
the
patella
in
a
15
-
year
-old
girl
.
She
complained
of
hemoarthrosis
and
recurrent
patellar
dislocation
in
the
early
knee
flexion
phase
.
Plain
radiography
and
computed
tomography
(
CT
)
showed
patellar
malalignment
(
quadriceps
angle
20
°
)
and
severe
dysplasia
of
the
trochlea
of
the
femur
(
sulcus
angle
170
°
)
.
Surgery
was
performed
,
consisting
of
trochleoplasty
in
addition
to
proximal
and
distal
realignment
.
Trochleoplasty
was
undertaken
using
a
modified
Dejour
technique
.
After
surgery
,
the
patient
complained
of
joint
contracture
.
Arthroscopic
release
of
fibrous
tissue
relieved
symptoms
and
obtained
normal
range
of
motion
without
patellar
dislocation
.
Postoperative
radiography
and
CT
demonstrated
improvement
of
the
quadriceps
angle
(
10
°
)
and
sulcus
angle
(
140
°
)
.
