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The lateral condyle index: a new index for assessing the length of the lateral articular trochlea as predisposing factor for patellar instability.
[trochlear dysplasia]
The
central
trochlea
has
been
considered
as
the
major
location
of
dysplasia
.
The
purpose
of
this
study
was
to
investigate
the
influence
of
the
lateral
trochlea
on
patellar
stability
and
to
establish
a
new
method
for
measuring
the
lateral
trochlea
on
sagittal
magnetic
resonance
(
MR
)
images
.
Twenty
-
eight
knees
of
23
patients
suffering
from
lateral
patellar
subluxation
(
12
knees
with
radiological
signs
of
central
trochlear
dysplasia
)
and
of
46
patients
without
patellofemoral
complaints
(
without
central
trochlear
dysplasia
)
were
analysed
.
The
lateral
condyle
index
was
designed
to
measure
the
lateral
trochlea
by
comparing
the
anterior
cartilaginous
trochlea
(
a
)
and
the
posterior
aspect
(
p
)
[
(
a
:
p
)
×
100
]
.
The
lateral
condyle
index
showed
high
interrater
reliability
(
r
=
.
94
)
and
was
significantly
(
p
<
0
.
001
)
lower
in
symptomatic
patients
(
86
%
)
than
in
the
control
group
(
93
%
)
.
These
results
show
high
clinical
relevance
of
the
lateral
trochlea
as
another
factor
for
patellar
instability
.
