A Biomechanical Comparison of Two Techniques of LatarjetProcedure in Cadaveric Shoulders

Traumatic anterior instability of the shoulder is commonly treated with the Latarjet procedure, which involves transfer of thecoracoidprocesswithaconjointtendontotheanterioraspectoftheglenoid.'etwomostcommontechniquesoftheLatarjetarethe classical and congruent arc techniques. 'e aim of this study was to evaluate the difference in force required to dislocate theshoulder after classical and congruent arc Latarjet procedures were performed. Fourteen cadaveric shoulders were dissected andosteotomised to produce a bony Bankart lesion of 25% of the articular surface leading to an “inverted pear-shaped” glenoid. Ananteroinferior force wasapplied whilst the arm wasin abduction and externalrotationusing a pulley system. 'e force neededtodislocate was noted, and then the shoulders underwent coracoid transfer with the classical and congruent arc techniques. 'eaverage force required to dislocate the shoulder after osteotomy was 123.57N. After classical Latarjet, the average force requiredwas 325.71N, compared with 327.14N after the congruent arc technique. 'is was not statistically significant. In this bio-mechanical cadaveric study, there is no difference in the force required to dislocate a shoulder after classical and congruent arctechniques of Latarjet, suggesting that both methods are equally effective at preventing anterior dislocation in the position ofabduction and external rotation.