Biomechanical evaluation of primary stability in revision Latarjet surgery using malleolar screws following failure of all-suture cerclage fixation.

BACKGROUND

Metal-free fixation methods, such as the all-suture cerclage technique for the Latarjet procedure, aim to minimize implant-related complications. Clinical studies suggest equivalent clinical results while reducing implant-related complications. However, recent studies have shown increased rates of graft migration and failure due to cortical cut-through. Revision strategies after such failures remain poorly described. The aim of this study is to evaluate the primary stability of revision Latarjet surgery using 2 conventional malleolar screws after failure of all-suture cerclage fixation compared with primary screw fixation. It is hypothesized that fixation of the coracoid graft using 2 malleolar screws in revision cases is equal to or higher than primary screw fixation.

METHODS

Twelve fresh-frozen cadaveric shoulder specimens (6 matched pairs) were previously tested in a study comparing suture cerclage and malleolar screw fixation. After failure due to cortical bone cut-through, revision surgery was performed on the cerclage specimens using 2 malleolar screws. Bone graft displacement under cyclic loading in 6 load levels (up to 300 N) and static conjoint tendon tension (10 N) was measured using a 3-dimensional optical marker system. Outcomes were compared with those from primary screw fixations.

RESULTS

No statistically significant differences in graft displacement under cyclic loading between the revision and primary groups at any load level (P > .05) could be found. The revision group showed slightly higher displacement at low load levels but demonstrated superior stability at higher loads compared with primary screw fixation. One intraoperative graft fracture was observed during revision, but it did not affect the primary stability of the tested specimen.

CONCLUSION

Revision Latarjet surgery using malleolar screw fixation after failed all-suture cerclage provides noninferior biomechanical primary stability compared with primary screw fixation. This technique appears to be a viable salvage option for addressing instability after failure of metal-free Latarjet constructs. Clinical studies need to be conducted in order to confirm the results of this biomechanical study.