POSTER ABSTRACTS - ISAKOS

Twenty-four cases (84.2%) had at least one MFL.
(2) Study using specimens obtained during TKA;
The aMFL was present in 5 (16.7%), and the pMFL
was present in all cases (100.0%). The crosssectional
area was 50.1±16.9 mm2 for the PCL
proper, 2.3±1.2 mm2 for the aMFL and 7.5±2.5
mm2 for the pMFL. The average ratio of the crosssectional
area of the MFLs to the PCL proper was
17.2% (4.0~38.9%). The origin of the pMFL from
the posterior horn of the lateral meniscus was
able to be classified into 5 types.
Discussion: This study confirmed that a majority
of JAPANese have at least one MFL. The origin of
the pMFL from the posterior horn of the lateral
meniscus was able to be classified into 5 types.
The maximum ratio of the cross-sectional area of
the aMFL and pMFL to the PCL proper was 38.9%.
The MFLs thus contribute significantly to the
cross-sectional area of the PCL Complex.
E-poster #153
Long Term Sport Involvement Does Not Lead
To Significantly Greater Incidence Of Sporting
Injuries In Elite Young Athletes
Alison Grieve, Aberdeen, UNITED KINGDOM,
Adam D.G Baxter-Jones, Saskatoon, CANADA
Nicola Maffulli, Stoke-on-Trent, Staffordshire
UNITED KINGDOM, Presenter
University of Aberdeen Medical School, Aberdeen,
SCOTLAND
Background: The long-term effects of high level
sports participation during childhood and
adolescence are unclear.
Hypothesis: There are no significant adverse longterm
effects of high level sports participation
(gymnastics, swimming, tennis and football)
during childhood and adolescence.
Study Design: Retrospective cohort study to
establish the long-term effects of sport,
performance success, gender and age of maturity
on rate and site of injury.
Methods: All 453 subjects originally enrolled in
the Training of Young Athletes (TOYA) study,
performed in the period 1987-1992, were invited
to participate in a 10 year follow up study. A selfadministered
questionnaire was designed to
obtain growth and injury data. The results were
analysed using chi square analysis.
Results: 203 questionnaires were returned. The
rates and location of injuries varied significantly
among the four sports. Athletes competing and
succeeding at international level have the greatest
injury rates. There was a significant association
between injury rates of female athletes and age at
menarche.
Conclusions: Athletes competing at international
level have the greatest injury rates. Even after 10
years, injury rates among elite young athletes
were low, and similar to those in the original
study. Long-term sport involvement does not lead
to significantly greater incidence of sporting
injuries.
E-poster #154
Reconstruction of a Bone Defect with
Injectable Biodegradable Bone Substitute: A
Histological and Biomechanical Studies in
Rabbits
Chih-Hwa Chen, Keelung, TAIWAN, Presenter
Chang Gung Memorial Hospital, Keelung, TAIWAN
INTRODUCTION
Bone graft materials are vital for bone defects
caused by trauma, infection, tumor and joint
reconstruction. Various synthetic materials for
bone substitute have been tested with unreliable
clinical application. Calcium sulfate has been
used as a bone-graft substitute. A solid form
calcium sulfate product could not fill the defect
completely to provide immediate structural
support. And it's resorption time of less than 6
weeks that is obviously insufficient in clinical use.
Calcium phosphate is regarded to have longer
resorption period for further scaffold support. The
purpose of this study is to evaluate the
mechanical and histological properties of an
injectable form calcium sulfate-calcium
phosphate composite as a bone substitute.
MATERIALS AND METHODS
A hemihydrate of calcium sulfate and calcium
phosphate can absorb water to become liquid
form. The composite was shaped into a cylindrical
blocks for compression test and strip form for
bending test. The microstructure, particle size and
particle distribution were examined and measured
by Zeta particle sizing software. Twelve adult NEW
ZEALAND rabbits were used for in-vivo study. The
rabbits were randomly divided into four groups for
sacrifice at 2, 4, 8, or 12 weeks respectively. A 10
mm depth and 5 mm diameter cylindrical bone
defect was created at both medial femoral condyle
of hind limbs were prepared for surgery. 5 gm
medical-grade calcium sulfate and 1.25 gm
calcium phosphate were mixed with 1.25ml saline
solution to become a liquid form, which was
injected to the bone defect. After sacrifice, femoral