POSTER ABSTRACTS - ISAKOS

Evaluation of Antero-posterior and Rotatory
Instability after Anteior Cruciate Ligament
Reconstruction
Hiroki Yamashita, Kanagawa JAPAN, Presenter
Yujiro Mori, Kanagawa JAPAN
Hiroshi Takagi, Kanagawa JAPAN
Toshiro Yonezawa, Kanagawa JAPAN
Akihiko Fujimoto, Kanagawa JAPAN
Showa Univ. Fujigaoka Rehab. Hosp, Yokohama,
JAPAN
The purpose of this study was to dynamic evaluate
the remaining knee instability after anterior
cruciate ligament (ACL) reconstruction. Knee
Motion Analyzer (CA4000) was used to evaluate
postoperative ACL stability. Seventy-one patients
who underwent ACL reconstruction by the
modified over-the-top method using a Kennedy
LAD reinforced patellar tendon. Twenty-five
patients who had remaining knee instability after
ACL reconstruction. There were 13 males and 12
females with a mean of 28 years. The results of
knee instability were classified into the following
three types. Type A: eight patients had both
antero-posterior(A-P) instability and rotatory
instability. Type B: eleven patients had only
rotatory instability. Type C: six patients remained
only A-P instability. The results of our study
showed that remaining three types of instability
after ACL reconstruction. We concluded that it
was necessary to evaluate both antero-posterior
stability and rotatory stability when doing the
evaluation of knee stability after ACL
reconstruction.
E-poster #384
Effect of Vision on Postural Sway in Anterior
Cruciate Ligament Injured Knees
Kazuhiro Okuda, Okayama, JAPAN, Presenter
Nobuhiro Abe, Okayama, JAPAN
Masuo Senda, Okayama, JAPAN
Yoshimi Katayama, Okayama, JAPAN
Hiroyuki Hashizume, Okayama, JAPAN
Hajime Inoue, Okayama, JAPAN
Okayama University graduate school, Okayama,
JAPAN
Introduction: It is well known that proprioception
is reduced in the ACL deficient knee. After ACL
injury, the knee in some patients may suddenly
give way during walking. All of the factors and
their roles are not clarified. We measured and
compared postural sway during one-leg standing
with eyes open and closed to assess the difference
between injured and non-injured leg.
Material and Methods: We examined 32 patients
(17 men and 15 women) with ACL injury before
surgery from March 2001 through January 2004.
Their mean age at the time of injury was 22.0 years
old (range 15 to 40 years), the mean height was
166.9 cm (range 152 to 183cm), the mean body
weight was 64.4 kg (range 50 to 97kg), and the
mean period from the injury to the test was 4.2
months (range 2 to 11 months). Ipsilateral and
contralateral legs were tested in each patient.
None of them presented obvious dysfunction in
the lower limbs, or central nerve system. Using a
gravicoder, we measured the factors of the
postural sway (local length per time, and
environmental area) in two legs and one leg
standing tests with eyes open or with eyes closed.
Knee laxity was measured by KT2000 (MED metric,
San Diego, CA).
Results and Conclusion: In the ACL injured knee,
the amplitude of postural sway increased
significantly when standing on one foot with
closed eyes, but did not increase significantly with
open eyes. There were no significant differences
with respect to sex or the presence or absence of
joint laxity. There was little correlation between
movements and the anterior drawer distance
measured by KT2000, or the ratio of injured side
to non-injured side in knee muscle strength. We
found that knee stability in ACL injured patients
was lower in the injured leg with eyes closed and
that vision appears to be dominant in
compensating for the decreased contribution of
the injured ACL.
E-poster #385
Endoscopic 3D Insertion Geometry of the Two
Functional Bundles of the ACL.
Ate Wymenga, Nijmegen, NETHERLANDS,
Leendert Blankevoort, Amsterdam,
NETHERLANDS
Jan Kooloos, Nijmegen, NETHERLANDS
Joan Luites, NETHERLANDS, Presenter
Sint Maartenskliniek, Nijmegen, NETHERLANDS
Introduction. The anterior cruciate ligament (ACL)
consists of an anteromedial bundle (AMB), thight
in flexion and a posterolateral bundle (PLB),
tensed near extenson. Restoring this functional
twobundled nature through a double bundle
anatomic reconstruction asks for a surgeonoriented
description of the insertion geometry
from an endoscopic view.