POSTER ABSTRACTS - ISAKOS

The maximal lateral diameter of intercondylar
notch was 15.7±1.3mm preoperatively, 19.0±1.8
mm one month postoperatively, and 18.5±1.8 mm
one year postoperaovely. Its height was 14.1±1.1
mm preoperatively, 15.7±1.3 mm one month
postoperatively and 15.2±1.5 mm one year
postoperatively. The area measured 200.7±33.5
mm2 preoperatively, 251.7±41.2 mm2 one month
postoperatively and 240.8±42.3 mm2 one year
postoperatively. We next analyzed the
relationship between the amount of notchplasty
and regrowth. The amount of notchplasty of the
lateral diameter was 3.1±1.4 mm (range, 1.4-
5.7mm) and the amount of regrowth was 0.4±0.5
mm (range, 0.05-1.2 mm); thus, the mean increase
calculated as the proportion of the amount of
regrowth to the amount of notchplasty was 22.6%
(range, 0.1-53.2%). In relationship to height, the
amount of notchplasty was 1.4±0.5 mm (range,
0.5-2.1 mm) and the amount of regrowth was
0.5±0.2 mm (range, 0.1-0.8 mm resulting in a
mean increase of 42.7% (range, 3.9-66.1%). No
correlation was observed between the amount of
notchplasty and the amount of regrowth in the
lateral diameter or the height.
Conclusion:
Bone regrowth in the intercondylar notch was
moderate one year after notchplasty. No
correlation was observed between the amount of
notchplasty and amount of regrowth.
E-poster #344
Stress Inside Grafts Used for 2-bundle Anterior
Cruciate Ligament Reconstruction
Shuji Horibe, Sakai, Osaka JAPAN,
Norimasa Nakamura, Suita, Osaka JAPAN
Ken Nakata, Amagasaki, Osaka JAPAN
Yoshiki Shiozaki, Sakai, Osaka JAPAN
Tomoki Mitsuoka, Yao, Osaka JAPAN
Konsei Shino, Habikino, Osaka JAPAN
Keisuke Kita, JAPAN, Presenter
Osaka Rosai Hospital, Osaka, JAPAN
INTRODUCTION: Initial tension applied to the
anterior cruciate ligament (ACL) graft is thought
to influence graft remodeling, and has been
discussed. Although the initial tension can be
controlled in clinical situation, it is unknown how
much stress exists inside transplanted grafts.
Especially in case of 2-bundle ACL reconstruction,
difference in stress between the two bundles may
compromise the clinical results. In this study, the
stress within the grafts was calculated by
measuring their cross sectional areas (CSAs).
METHODS: 109 patients underwent arthroscopic
two-bundle ACL reconstruction using multiplied
hamstring tendons with Endobutton CL for
femoral fixation and with DSP (double spike plate)
for tibial fixation. The CSA of the midportion of
each bundle (anteromedial bundle (AMB) and
posterolateral bundle (PLB)) was measured using
a custome-made area micrometer. Each portion of
the graft was fixed under the same tension at 40N
at 20 degrees of knee flexion. Intra-graft stress was
estimated by dividing the applied tension by CSA.
RESULTS: The mean CSAs of AMB and PLB were
21.8±5.8 and 19.5±5.0 mm2, respectively. The
mean estimated stress inside AMB was 2.0 MPa
with a range from 1.0 to 3.2, while that for PLB
was 2.5 MPa ranging from 1.1 to 5.6.
DISCUSSION & CONCLUSION: This study has
shown that intra-graft stress is different between
the two bundles, even if the same tension is
applied to each one. Considering uneven stress
distribution inside the grafts which should
influence the graft maturation and knee
kinematics, intra-graft stress should be more
strictly controlled in 2-bundle ACL reconstruction.
E-poster #345
Temporal Change in the Tibiofemoral
Relationship in the Extended Knee before and
after Anterior Cruciate Ligament
Reconstruction
Takashi Soejima, Kurume, Fukuoka JAPAN,
Presenter
Takashi Inoue, Kurume, Fukuoka JAPAN
Hidetaka Murakami, kurume, Fukuoka JAPAN
Tomonoshin Kanazawa, Kurume, Fukuoka JAPAN
Michihiro Katouda, Kurume, Fukuoka JAPAN
Kensei Nagata, Kurume, Fukuoka JAPAN
Kurume University School of Medicine, Fukuoka,
JAPAN
Introduction:
Anterior cruciate ligament reconstruction (ACLR)
results in improved function and stability.
However, it is not yet known whether or not and
how the improved stability is related to any
improved tibiofemoral relationship. ACLR might
not recover normal tibiofemoral kinematics, even
though stability appears to be sufficiently
recovered on instrumented stability examination
with a KT-2000 arthrometer. Here, we have
investigated the temporal changes achieved in the
tibiofemoral relationship after successful ACLR.
Materials and Methods: