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A random Abstract
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Which patellae are likely to redislocate?
[trochlear dysplasia]
The
purpose
of
this
study
was
to
identify
the
risk
factors
for
recurrent
lateral
patellar
dislocations
and
to
incorporate
those
factors
into
a
patellar
instability
severity
score
.
Sixty
-
one
patients
[
male
/
female
35
/
26
;
median
age
19
years
(
range
9
-
51
years
)
]
formed
the
study
group
for
this
investigation
.
Within
the
study
group
,
40
patients
experienced
a
patellar
redislocation
within
24
months
after
the
primary
dislocation
,
whereas
21
patients
,
who
were
assessed
after
a
median
follow-up
of
37
months
(
range
24
-
60
months
)
,
had
not
experienced
a
subsequent
episode
of
lateral
patellar
instability
.
In
all
patients
,
age
at
the
time
of
the
primary
dislocation
,
gender
,
the
affected
body
side
,
body
mass
index
,
bilateral
instability
,
physical
activity
according
to
Baecke
's
questionnaire
,
the
grade
of
trochlear
dysplasia
,
patellar
height
,
tibial
tuberosity-trochlear
groove
(
TT-
TG
)
distance
,
and
patellar
tilt
were
assessed
.
The
odds
ratio
(
OR
)
of
each
factor
with
regard
to
the
patellar
redislocation
was
calculated
using
contingency
tables
.
Based
on
these
data
,
a
"
patellar
instability
severity
score
"
was
calculated
.
The
patellar
instability
severity
score
has
six
factors
:
age
,
bilateral
instability
,
the
severity
of
trochlear
dysplasia
,
patella
alta
,
TT-
TG
distance
,
and
patellar
tilt
;
the
total
possible
score
is
seven
.
Reapplying
this
score
to
the
study
population
revealed
a
median
score
of
4
points
(
range
2
-
7
)
for
those
patients
with
an
early
episode
of
patellar
redislocation
and
a
median
score
of
3
points
(
range
1
-
6
)
for
those
without
a
redislocation
(
p
=
0
.
0004
)
.
The
OR
for
recurrent
dislocations
was
4
.
88
(
95
%
CI
1
.
57
-
15
.
17
)
for
the
patients
who
scored
4
or
more
points
when
compared
with
the
patients
who
scored
3
or
fewer
points
(
p
=
0
.
0064
)
.
Based
on
the
individual
patient
data
,
the
patellar
instability
severity
score
allows
an
initial
risk
assessment
for
experiencing
a
recurrent
patellar
dislocation
and
might
help
differentiate
between
responders
and
non-responders
to
conservative
treatment
after
primary
lateral
patellar
instability
.
Case-control
study
,
Level
III
.
Diseases
Validation
Diseases presenting
"recurrent patellar dislocation"
symptom
trochlear dysplasia
This symptom has already been validated