SMW Supplementum 193 - Swiss Medical Weekly

27 S SWiSS Med Wkly 2012;142(Suppl 193) · www.smw.ch Free communications
FM104
The Biomechanical Effectiveness of Classic
and Congruent Arc Latarjet Procedures
Gàbor J. Puskàs1 , Josh Giles2 , Marc Welsh2 ,
George Athwal2 , Jim Johnson2 1 2 Universitätsklinik, Hand and Upper Limb Center,
London Ontario, Canada
Introduction: The Latarjet procedure for treatment of recurrent
shoulder instability consists of fixation of the osteotomized coracoid
process to the anterior glenoid rim. We compared the strain onto the
glenoid, the humeral displacement and the ultimate load to failure of
two differently orientatated coracoid fixations.
Methods: Eight cadaveric shoulders (four pairs) were subjected to a
compressive loading using a testing machine (Instron, MA) before and
after one of two Latarjet reconstructions of a simulated 25% anterior
glenoid defect. For the Classic method the coracoid was fixed so that
its lateral edge became part of the glenoid face, while for the
Congruent it was its inferior surface. We applied 100 cycles of 1 Hz
at 50, 100, 150 and 200N directed 30° anteriorly on the glenoid rim.
Glenoid strain and humeral displacement were recorded and
compared between intact bone and after Latarjet reconstruction.
Paired t-tests were used to compare between the various testing
states. Statistical significance was set at p