Análise biomecanica da dupla fixa??o de enxerto tendinoso em tíbia porcina – uso de parafuso de interferência e agrafe

摘要

Objective The aim of the study was to compare the mechanical behavior of interference screw tibial fixation vs. screw‐plus‐staple tibial fixation in an animal model. Methods Thirty‐six pieces of swine knee specimens were selected and divided into two groups: Group 1, tibial fixation with interference screw (n = 17), and Group 2, fixation with interference screw and staple (n = 19). The models were submitted to a single cycle of tension testing. The following variables were measured: graft cross‐sectional area, failure point on 10?mm (Fsub10/sub), yield load (Fsuby/sub), and stiffness. Results The mean values of graft cross‐sectional area, Fsub10/sub, Fsuby/sub, and stiffness did not present significant differences between the groups. Conclusion The addition of a second staple‐type ligament fixation device, complementing the interference screw, did not increase the mechanical safety of the system.