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The use of rapid prototyped implants to simulate knee joint abnormalities for in vitro testing: a validation study with replica implants of the native trochlea.
[trochlear dysplasia]
To
investigate
the
biomechanical
effect
of
skeletal
knee
joint
abnormalities
,
the
authors
propose
to
implant
pathologically
shaped
rapid
prototyped
implants
in
cadaver
knee
specimens
.
This
new
method
was
validated
by
replacing
the
native
trochlea
by
a
replica
implant
on
four
cadaver
knees
with
the
aid
of
cadaver-
specific
guiding
instruments
.
The
accuracy
of
the
guiding
instruments
was
assessed
by
measuring
the
rotational
errors
of
the
cutting
planes
(
on
average
3
.
01
°
in
extension
and
1
.
18
°
in
external
/
internal
rotation
)
.
During
a
squat
and
open
chain
simulation
,
the
patella
showed
small
differences
in
its
articulation
with
the
native
trochlea
and
the
replica
trochlea
,
which
could
partially
be
explained
by
the
rotational
errors
of
the
implants
.
This
study
concludes
that
this
method
is
valid
to
investigate
the
effect
of
knee
joint
abnormalities
with
a
replica
implant
as
a
control
condition
to
account
for
the
influence
of
material
properties
and
rotational
errors
of
the
implant
.
