POSTER ABSTRACTS - ISAKOS
POSTER ABSTRACTS - ISAKOS
POSTER ABSTRACTS - ISAKOS
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and voluntary response intervals after platform<br />
movement.<br />
Results: Non-copers showed greater knee flexion<br />
than uninjured subjects, and had a posterior tibial<br />
position and altered hamstring recruitment<br />
compared to the other groups. Potential copers<br />
demonstrated greater medial quadriceps activity<br />
while maintaining knee kinematics similar to<br />
uninjured subjects. Both potential copers and<br />
non-copers had greater co-contraction between<br />
medial hamstrings and quadriceps than uninjured<br />
subjects. All excitatory muscle activation<br />
occurred in the intermediate reflex interval.<br />
Discussion and Conclusions: Non-copers<br />
displayed aberrant muscle recruitment that may<br />
contribute to knee instability. Potential copers<br />
maintained normal tibial position using a strategy<br />
that permits quadriceps activation without<br />
excessive anterior tibial translation. Muscle<br />
recruitment in the intermediate reflex interval<br />
suggests neuromuscular training may influence<br />
the strategies.<br />
E-poster #363<br />
Computer Assisted ACL Reconstruction: Results<br />
at One Year of the First 30 Cases<br />
Guy Messerli, Geneva, SWITZERLAND, Presenter<br />
Domizio Suva, Geneva, SWITZERLAND<br />
Christophe Barea, Geneva, SWITZERLAND<br />
Pierre Hoffmeyer, Geneva, SWITZERLAND<br />
Daniel Fritschy, Geneva, SWITZERLAND<br />
Jacques Menetrey, Geneva, SWITZERLAND<br />
University Hospital of Geneva, Geneva,<br />
SWITZERLAND<br />
BACKGROUND The success of ACL<br />
reconstruction depends mainly upon the correct<br />
positioning of tibial and femoral tunnels. These<br />
tunnels are actually placed under arthroscopic<br />
view with the help of guides which may generate<br />
high variability and errors. The use of a CAOS<br />
system should improve the precision and the<br />
reproducibility in tunnel positioning. OBJECTIVE<br />
To evaluate the outcome of the first patients<br />
operated upon with the CAOS system. MATERIAL<br />
AND METHODS 30 consecutive patients (30<br />
knees) underwent an ACL reconstruction with an<br />
autologous BPTB graft using the CAOS system.<br />
There were 27 males and 3 females, mean age 25<br />
(15-42) years. All patients were assessed clinically<br />
and with radiographs at 6 weeks, 3, 6, and 12<br />
months post-operatively. The clinical evaluation<br />
was performed with the IKDC 2000 score, the<br />
anterior laxity evaluated by arthrometric<br />
measurement, and the placement of tunnels<br />
assessed on radiographs using the method<br />
described by Aglietti et al. RESULTS 29 patients<br />
were graded A with the subjective and objective<br />
IKDC 2000. One patient could not be graded due<br />
to the traumatic tear of his graft sustained before<br />
the 12th post-operative month. The mean manual<br />
max. side to side difference measured with the KT-<br />
1000 was 1.1mm (0-3). According to Aglietti’s<br />
criteria, all tibial (mean ratio 37,2%) and femoral<br />
(mean ratio 63.5%) tunnels were correctly placed.<br />
No major complication was noted.<br />
CONCLUSIONS This study validates the use of a<br />
navigation system for ACL reconstruction. This<br />
technology is precise, reliable, applicable in<br />
operative theater, yields excellent results, and<br />
allows the correct placement of the tibial and<br />
femoral tunnels in all knees.<br />
NB: 50 knees will be reported at the meeting,<br />
control in process<br />
E-poster #364<br />
Bone Tunnel Enlargement after Anterior<br />
Cruciate Ligament Reconstruction Using<br />
Femoral Cross Pin Fixation.<br />
Takashi Ogiuchi, Saitama, JAPAN, Presenter<br />
Ichiro Torigoe, Ageo, Saitama JAPAN<br />
Daisuke Iwasawa, Ageo, Saitama JAPAN<br />
Toshiro Ishibashi, Ageo, Saitama JAPAN<br />
Takeshi Muneta, Tokyo, JAPAN<br />
Saitama Prefectural Rehabilitation Center, Ageo,<br />
Saitama, JAPAN<br />
Purpose: The purpose of this study was to<br />
evaluate the amount of bone tunnel enlargement<br />
that occurred after anterior cruciate ligament<br />
(ACL) reconstruction using autogenous hamstring<br />
tendons fixed with the femoral cross pin (TransFix<br />
system) and to determine the factors related with<br />
the bone tunnel enlargement and clinical results.<br />
Methods: We examined 38 knees of 37 patients<br />
who had undergone ACL reconstruction with a<br />
minimum follow-up of 1 year. ACL was<br />
reconstructed with multipled hamstring tendons,<br />
which were fixed to femoral side with the TransFix<br />
pin and to tibial side with the soft interference<br />
screw and the suture screw. We evaluated the<br />
bone tunnel diameter of femoral and tibial side<br />
at the level of inside orifice on the radiographs.<br />
Bone tunnel enlargement over 2mm was classified<br />
in the enlarged group and we examined the<br />
correlation between bone tunnel enlargement and<br />
age, gender, distance between fixation site, pre-
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