POSTER ABSTRACTS - ISAKOS

E-poster #307
Stress Fractures of the Femur After Cross-pin
ACL Reconstruction
Rafael Arriaza Loureda, La Coruna, SPAIN,
Presenter
Jose Rodriguez, La Coruna, SPAIN
Carlos Sampedro Curbera, La Coruna, SPAIN
Jesus Aizpura Prada, La Coruna, SPAIN
Gonzalo Couceiro Sanchez, La Coruna, SPAIN
Hospital USP Santa Teresa, La Coruna, SPAIN
Two cases of femoral stress fractures after ACL
reconstruction using hamstring tendons and
cross-pin fixation are presented.
During the funtional rehabilitation pahse after
succesful ACL reconstruction with Bio-Tranfix
femoral fixation, two professional athletes
presented with pain in the medial side of the knee
that worsened with running and weight-bearing
exercises. No instability or joint effusion were
present, and a typical stress fracture pattern of
pain was readily evident. MRI studies showed an
area of increased signal compatible with bone
oedema arising in the medial supracondilar area
of the femur, around the exit orifice of the fixation
device guide-pin. The diagnosis of stress fracture
of the femur was made in both cases and
treatment with rest and progressive activity
resumption allowed them to heal and recover to
full activity.
The possible causes of the stress fractures in
these cases seem to be related to the position of
the exit hole of the guide-pin in the supracondilar
medial area of the femur and to the increased
diameter of the pin as compared to other crosspin
devices.
We consider it important to report this unusual
complication to the surgeons using cross-pin
fixation and accelerated rehabilitation programs,
so that it might be promptly recognized to avoid
further complications.
E-poster #308
Active and Passive Mechanisms of Anterior
Cruciate Ligament Rupture: Correlation with
MRI and Operative Findings of Injury Severity
Naven Duggal, Sydney, AUSTRALIA,
Bruno M Giuffra, Sydney, AUSTRALIA
Myles Coolican, Sydney, AUSTRALIA
David Parker, Sydney, AUSTRALIA, Presenter
Sydney Orthopaedic, Arthritis & Sports Medicine,
Sydney, NSW, AUSTRALIA
- INTRODUCTION - Anterior cruciate ligament
(ACL) injuries have historically been classified as
non-contact or contact based on the mechanism
of injury. The purpose of this study was to
establish a detailed correlation between
mechanism and the associated
E-poster #309
Consequences of a Mid-third BPTB-autograft
Excision on Patellofemoral Biomechanics and
Knee Kinematics
Michael Bohnsack, Hannover, GERMANY,
Presenter
Arne Wilharm, Hannover, GERMANY
Chris Hurschler, Hannover, GERMANY
Oliver Rahmann, Hannover, GERMANY
Carl Joachim Wirth, Hannover, GERMANY
Department of Orthopaedic Surgery, Hannover,
GERMANY
Introduction:
This biomechanical study evaluates the
consequences of a mid-third BPTB-autograft
excision on patellofemoral biomechanics and
knee kinematics. Of particular interest was the
potential role of a BPTB-autograft excision on
postoperative anterior knee pain in ACL
replacement surgery.
Methods:
Isokinetic knee extension from 120 of flexion to
full extension was simulated on 9 human knee
cadaver specimens (5 male, 4 female, average age
at death 43 years). Joint kinematics was evaluated
by ultrasound sensors (CMS 100TM, Zebris, Isny,
GERMANY), and retro-patellar contact pressure
was measured using a thin-film resistive ink
pressure system (K-ScanTM 4000, Tekscan,
Boston). All data were taken before and after
excision of a mid-third BPTB-autograft.
Results: Following excision of a mid-third patella
tendon autograft we found a significant (p