POSTER ABSTRACTS - ISAKOS

The arthroscopic assisted group was small. The
results showed that the arthroscopic assisted
meniscal transplantation had a significant better
regain of function compared to the open
technique at 6 and 12 months follow up (p=0.02).
E-poster w/ Standard #760
Motion Alterations Six Months and One Year
After Partial Medial Meniscectomy
Maria Vittoria Bulgheroni, Varese, ITALY
Mario Ronga, Varese, ITALY
Alessandro Manelli, Varese, ITALY
Paolo Bulgheroni, ITALY, Presenter
Clinica Ortopedica ''M. Boni''. Ospedale di
Varese, Varese, ITALY
Introduction.
Knee joint’s degenerative changes after
meniscectomy are well known. Less evidence
exists on underlying biomechanical alterations.
Aim of this study is the investigation of lower
limbs biomechanics before and after
meniscectomy.
The focus is on gait and squatting exercises. Gait
is chosen because of its daily life role while
squatting implies high stress of knee joint
structure. Both the movements show high
statistical repeatability intra and inter subjects.
Materials and methods.
Ten volunteers candidate to partial medial
meniscectomy for meniscal tear underwent
motion analysis just before surgery, six months
and one year after. Ten healthy volunteers acted
as a control group.
All the subjects perform three gait trials and three
squatting movements.
Data were acquired by means of Vicon motion
analyser and AMTI forces platform.
Results.
In gait patterns investigation, joint kinematics
does not show significant modifications before
and after surgery, while dynamic analysis stresses
alterations in knee sagittal moment. Before
surgery, healthy and affected limbs show
significant differences, also referring to control
group, at first impact and late stance. After
surgery, asymmetries between limbs are no more
significant at first impact, while the behaviour in
late stance shows a reduced knee extension
moment in the affected limb not present before
surgery.
In squatting investigation, main focus was on
repeatability, being the mean behaviour
consistent before and after surgery. Before surgery
high inter subjects variability affects knee joint
angle, stating pain response; while after surgery
high variability affects also hip and ankle,
suggesting a new approach to mechanical
equilibriums.
Conclusions.
After meniscectomy, gait and squatting patterns
are still altered. Before surgery, the joint
mechanical structure is not highly altered and
modifications are mainly due to pain avoidance
schemas; after partial meniscectomy, pain
disappears and the new joint behaviours are
probably caused by the new mechanical asset
and/or proprioceptive mechanisms.
E-poster w/ Standard #761
Influence of Tibial Slope on Knee Kinematics,
Tibial Cartilage Pressure and Ligament Strain:
A Biomechanical Study in Human Cadaveric
Knees
Jens Agneskirchner, Hannover, GERMANY,
Presenter
Chris Hurschler, Hannover, GERMANY
Christina Stukenborg-Colsman, Hannover,
GERMANY
Andreas B Imhoff, Munich, GERMANY
Philipp Lobenhoffer, Hannover, GERMANY
Department of Surgery Henriettenstiftung
Hannover, Hannover, GERMANY
Introduction:
Valgus high tibial osteotomy is an established
treatment for unicompartimental varus
osteoarthritis. However, only little is known about
the influence of an osteotomy in the sagittal plane
on biomechanical parameters such as cartilage
pressure and joint kinematics. In this study, we
investigated the effects of a high tibial flexion
osteotomy in a human cadaver model.
Materials and methods:
In 7 fresh human cadaveric knees a flexion
osteotomy of the proximal tibia was performed
and the tibial slope was gradually increased. An
isokinetic flexion-extension motion was simulated
in a kinematic knee simulator. The contact
pressure and topographic pressure distribution in
the medial joint space was recorded using an
electronic pressure sensitive film. Simultaneously
the motion of the tibial plateau was analysed 3-
dimensionally with an ultrasonic tracking system.
The traction force to the quadriceps tendon which
was applied by the simulator for extension of the
joint was continuously measured. Strain in the
anteromedial bundle of the ACL was analysed