POSTER ABSTRACTS - ISAKOS

ligament (ACL) reconstruction using
semitendinosus muscle tendon were studied. The
quadriceps strength was isokinetically measured
during concentric and eccentric contractions
before and after ACL reconstruction. Before
surgery, the injured : un injured ratio was 72.9%
for eccentric contraction, which was significantly
lower than the 81.4% for concentric contraction.
For postoperative muscle, the injured : un injured
ratio was 98.6% for eccentric contraction and
80.6% for concentric contraction, showing better
recovery of muscle strength for eccentric
contraction. The reason why observation of lower
muscle strength for eccentric contraction is more
important than for concentric contraction in knees
before ACL reconstruction may be explained by
the fact that movements such as stop and turn
become difficult due to ACL dysfunction. Thus,
ACL deficient patients avoid exerting eccentric
knee extension and contraction forces even in
daily living activities. On the other hand, once the
joint instability is improved by ACL
reconstruction, patients do not need to avoid
movements such as stop and climbing down stairs
that require eccentric contraction strength. This
may account for good recovery of the muscle
strength for eccentric contraction.
E-poster #358
Revision Anterior Cruciate Ligament Surgery in
Sports Contact Athletes.
Mario Larrain, Buenos Aires, ARGENTINA,
Presenter
David M. Mauas, Buenos Aires ARGENTINA
Cristian Collazo, Buenos Aires ARGENTINA
Horacio E. Rivarola, Buenos Aires, ARGENTINA
Argentine Rugby Union, Buenos Aires,
ARGENTINA
PURPOSE: The purpose of this study is to evaluate
the results of ACL revision surgeries, analysing
their indications, causes of re-rupture,
preoperative studies, therapeutic plan, technical
difficulties found during these surgeries and their
possible solutions.
METHODS: We performed a retrospective study of
the ACL revisions, operated between 1992 and
2002. Seventy-seven patients with rupture of the
ACL graft underwent surgery. Seventy-four
patients were male and only three females (mean
age was 27 years, 16-43 y), 86% of these were
contact athletes. All the patients consulted for
residual instability, with or without pain and
effusion, confirmed by Lachman and Pivot Shift
tests. The causes of failure were studied following
the Pittsburgh University (USA) criteria taking into
account the following factors: technical errors,
traumatic and failure in graft incorporation. The
average time between the primary surgery and rerupture
was 42 months (range 3 to 10 years). In 60
% of the cases (46), the graft used for the revision
was hamstring autograft, and in 27% (21c) was B-
PT-B autograft due to failure of the primary
surgery performed with B-PT-B autograft and
hamstring autograft, respectively.
RESULTS: We mainly found mixed failures,
combing a 63% of traumatic factors with 59% of
technical errors. The most frequent technical
failure was in the positioning of the femoral bone
tunnel. With an average follow-up of 6.4 years
(2.2-12.2 years), we had a 92.3% of excellent and
good results using Lisholm score. Stability was
assessed with comparative KT-1000 max; in 96% of
cases joint stability was restored. 53.2% of the
series was found to be normal (0-2mm) and 42.8%
was subnormal (3-5mm). A minimal difference of
less than 3 degrees was observed in the extension
with respect to the healthy side in 86.5% of the
cases, that does not involve the revision’s final
result. 87 % (67c) of the patients did not present
any limitation in their sports practice.
CONCLUSIONS: The success of the revision
surgery begins with a thorough understanding of
the causes of failure, taking into account that in
most cases these are combined. Although we can
obtain satisfactory stability rates with a
technically appropriate procedure, the final
results in revision surgery also depends on other
variables such as articular cartilage and meniscal
status.
E-poster #359
Arthroscopic ACL Reconstruction using Fresh-
Frozen Achilles Allograft(-Clinical results,
Recovery of sports activity-)
Dae Ho Ha, Iksan, SOUTH KOREA
Dong Chul Kim, Iksan, Chunbuk SOUTH KOREA
Jin Young Park, Iksan, Chunbuk SOUTH KOREA
Churl Hong Chun, SOUTH KOREA, Presenter
School of Medicine, Wonkwang University, Iksan,
KOREA
Purpose : ACL (anterior cruciate ligament)
reconstruction using Achilles allograft was done
for whom ACL injured person in recreational
sports activity. The purpose of this study was to