POSTER ABSTRACTS - ISAKOS

PLRI was treated using a biceps tenodesis or
posterolateral corner sling through proximal tibia
or fibular head obliquely from anteroinferior to
posterosuperiorly.
The clinical results were evaluated with
OAK(Orthopadishe Arbeitsgruppe Knie) and
IKDC(International Knee Documentation
Committee) knee scoring system. The integrities
of physical findings were assessed with pull, varus
stress radiograph using Telos stress device and
the manual maximum displacement test using a
KT-2000TM arthrometer with 30 degrees flexion of
the knee.
RESULTS: At the last follow up, the average 64.1
OAK score, 7.9 mm(pull) displacement by stress
radiographs, 1.9mm(varus) and 6.5 mm
displacement by KT-1000TM arthrometer were
improved to an average 84.4, 2.1 mm, 0.4 mm, 2.3
mm, respectively. By the IKDC and OAK scoring
systems, 22(92%) cases and 21(88%), respectively,
showed satisfactory clinical outcome.
CONCLUSION: The modified posterolateral corner
sling method may improve the quality of outcome
of arthroscopic ACL reconstruciton combined
PLRI. In a patient with varus instability, combined
LCL implication yielded successful result.
E-poster #339
Comparison of Quadriceps and Hamstring
Muscle Strength following ACL reconstruction
Paul Yun-Tin Tse, Kowloon, Hong Kong CHINA,
Rebecca Ching Man Leung, Kowloon, HONG
KONG
Caleb Tsz Kau Wong, Shatin, NT, Hong Kong
CHINA, Presenter
Tsz-kau Wong, Hong Kong, CHINA
Kwong Wah Hospital, Kowloon, CHINA
A retrospective cross-sectional study was carried
out to investigate the knee strengths of subjects
who received anterior cruciate ligament (ACL)
reconstruction using either bone-patella tendonbone
(BPTB) or hamstring (H) graft.
37 subjects aged from 18-45 who had undergone
unilateral ACL reconstruction from January 2001
to February 2002 participated in the study on a
voluntary basis. There were 18 patients in the
BPTB and 19 patients in the H group. At an
average follow up of 24 months, all subjects were
examined for their knee extension and flexion
strength with an isokinetic dynamometer on the
operated and non-operated knee at 60 /sec, 120
/sec and 180 /sec angular speed respectively. The
knee laxity was examined by a KT-1000
arthrometer, and subjective functional outcomes
were assessed via the Tegner activity and Lysholm
knee score.
There were no statistically significant differences
on both knee extension and flexion strength
between the two groups. Significant difference
was observed in the knee extensor strength of the
operated knee compared with the good side
(F=29.88, p=0.0001) across the 3 angular speeds
for both groups. The overall residual weakness of
knee extensor strength in BPB and H group was
11.9% and 13.5% respectively. Although, there was
significant deficit of knee flexor strength between
sides within two groups of subjects (4.3% to 6.1%
of knee flexors deficit with F=9.086 & p=0.005),
differences smaller than 10% of deficit between
sides can be considered as clinically not
significant. No significant difference was shown
on knee laxity, the Tegner activity score and the
Lysholm knee score.
E-poster #340
Perturbation Training Induces Dynamic
Stability in the ACL Injured Knee
Terese L. Chmielewski, Gainesville, FL, USA
Wendy J. Hurd, Newark, DE, USA, Presenter
Michael Axe, Newark, DE USA
Lynn Snyder-Mackler, Newark, DE USA
University of Delaware, Newark, DE, USA
INTRODUCTION: Motor control strategies for
those who successfully compensate for the
absence of the ACL (copers) are different from
those who do not compensate well for the injury
(non-copers). Rehabilitation that includes
perturbation training, a specialized training that
involves support surface translations, has helped
improve dynamic knee stability in certain
individuals with ACL rupture soon after injury
(potential copers) (Fitzgerald et al., 2000). The
purpose of this study was to elucidate the
mechanism underlying the development of
dynamic stability of the knee as a result of
perturbation training in potential copers with an
ACL injury. Variables of interest included peak
knee flexion angle and co-contraction indices of
the vastus lateralis-lateral hamstring and vastus
lateralis-medial gastrocnemius.
METHODS: Sixteen individuals with acute,
unilateral ACL rupture, categorized as potential
copers, and 16 active, uninjured subjects were
recruited for this study. All subjects participated
in five trials of free speed walking (undisturbed),
and trials during which a platform translated