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Our Project
Our Team
Functional shoulder radiography with use of a dynamic flat panel detector.
[thoracic outlet syndrome]
Our
purpose
in
this
study
was
to
develop
a
functional
form
of
radiography
and
to
perform
a
quantitative
analysis
for
the
shoulder
joint
using
a
dynamic
flat
panel
detector
(
FPD
)
system
.
We
obtained
dynamic
images
at
a
rate
of
3
.
75
frames
per
second
(
fps
)
using
an
FPD
system
.
Three
patients
and
5
healthy
controls
were
studied
with
a
clinically
established
frontal
projection
,
with
abduction
of
the
arms
.
The
arm
angle
,
glenohumeral
angle
(
G-
angle
)
,
and
scapulothoracic
angle
(
S-
angle
)
were
measured
on
dynamic
images
.
The
ratio
of
the
G-
angle
to
the
S-
angle
(
GSR
)
was
also
evaluated
quantitatively
.
In
normal
subjects
,
the
G-
angle
and
S-
angle
changed
gradually
along
with
the
arm
angle
.
The
G-
angle
was
approximately
twice
as
large
as
the
S-
angle
,
resulting
in
a
GSR
of
2
throughout
the
abduction
of
the
shoulder
.
Changes
in
G-
angle
and
S-
angle
tended
to
be
irregular
in
patients
with
shoulder
disorders
.
The
GSR
of
the
thoracic
outlet
syndrome
,
recurrent
dislocation
of
the
shoulder
joint
,
and
anterior
serratus
muscle
paralysis
were
3
-
7
.
5
,
4
-
9
.
5
,
and
3
.
5
-
7
.
5
,
respectively
.
The
GSR
of
the
anterior
serratus
muscle
paralysis
improved
to
approximately
2
after
orthopedic
treatment
.
Our
preliminary
results
indicated
that
functional
radiography
by
FPD
and
computer-aided
quantitative
analysis
is
useful
for
diagnosis
of
some
shoulder
disorders
,
such
as
the
thoracic
outlet
syndrome
,
recurrent
dislocation
of
the
shoulder
joint
,
and
anterior
serratus
muscle
paralysis
.
The
technique
and
procedures
described
comprise
a
simple
,
functional
shoulder
radiographic
method
for
evaluation
of
the
therapeutic
effects
of
surgery
and
/
or
rehabilitation
.
Diseases
Validation
Diseases presenting
"established frontal projection, with abduction of the arms"
symptom
thoracic outlet syndrome
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