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Trochlear boss height measurement: A comparison of radiographs and MRI.
[trochlear dysplasia]
A
key
anatomical
consideration
and
determinant
of
surgical
approach
in
trochlear
dysplasia
is
the
trochlear
boss
height
(
TBH
)
,
traditionally
defined
by
measurements
on
plain
X-
rays
(
XR
)
.
Magnetic
resonance
(
MR
)
imaging
is
increasingly
used
for
pre-operative
planning
and
follow-up
.
However
,
it
is
unclear
whether
measurement
of
TBH
on
XR
is
applicable
to
MR
.
The
aim
of
this
study
was
to
establish
the
reliability
of
TBH
measurement
on
MR
compared
to
XR
.
T
his
study
used
lateral
knee
radiographs
and
MR
scans
of
14
knees
of
patients
with
trochlear
dysplasia
,
six
knees
of
non-
dysplastic
patients
with
anterior
knee
pain
(
AKP
)
,
and
five
knees
of
non-
dysplastic
controls
with
no
AKP
.
Correlation
between
XR
and
MR
measurements
was
assessed
using
Pearson
correlation
coefficients
.
Agreement
between
methods
and
observers
was
assessed
using
Bland-
Altman
plots
with
95
%
limits
of
agreement
.
Intra-
and
inter-observer
reliability
was
assessed
using
intraclass
correlation
coefficients
(
ICC
)
.
Bland-
Altman
charts
showed
a
total
width
of
95
%
limits
of
agreement
of
4
.
78
mm
for
XR
and
MR
subchondral
bone
(
SB
)
TBH
measurements
,
and
6
.
73
mm
for
XR
and
MR
cartilage
TBH
measurements
.
Inter-observer
ICCs
were
0
.
86
for
XR
,
0
.
62
for
MR
SB
,
and
0
.
53
for
MR
cartilage
.
The
widths
of
the
Bland-
Altman
95
%
limits
of
agreement
between
observers
were
4
.
79
mm
(
XR
)
,
5
.
04
mm
(
MR
SB
)
and
4
.
74
mm
(
MR
cartilage
)
.
Measurement
of
TBH
on
MR
is
not
directly
interchangeable
with
XR
.
Adjustments
need
to
be
made
to
treatment
thresholds
based
on
XR
measurement
if
MR
is
used
instead
.
Diseases
Validation
Diseases presenting
"mr scans of 14 knees of patients with trochlear dysplasia"
symptom
trochlear dysplasia
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