ObjectiveThe 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.MethodsThirty-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 (F10), yield load (Fy), and stiffness.ResultsThe mean values of graft cross-sectional area, F10, Fy, and stiffness did not present significant differences between the groups.ConclusionThe addition of a second staple-type ligament fixation device, complementing the interference screw, did not increase the mechanical safety of the system.
Objective
To evaluate and compare the biomechanical behavior of two different suture configurations:“X”and“Loop”in the preparation of tendons for knee ligament reconstruction.
Methods
We used common digital extensor tendons of bovine that can replace the human flexor tendons in experimental studies of traction. In the first group, point “X” suture with
Ethibond
® No. 5 began in the distal graft points transfixing, with spacing of 7.5 mm points to reach 03 cm distal to the beginning of the suture, returning suture in the same manner, transfixing the tendon in open spaces across the suture configuration “X”. The second group, the point “Loop” was prepared with the same type
Ethibond
® No. 5 of the needle wire was removed for use only of the wire was mounted in a twofold manner in a single piece forming a needle loop. Started the suture 3 cm from the end of the graft through loops and transfixing points throughout the tendon substance, with spacing between dots of 7.5 mm.
Result
The Maximum Force of Rupture suture in “Loop” was 444.45 N and the suture in “X” was 407.59 N with statistical significance (p = 0.030). The average Tension obtained at the suture in “Loop” was 27.67 MPa and at the suture in “X” was 25.73 MPa with a statistically significant difference (p = 0.036). The stiffness showed no statistical differences (p = 0.350) at 11.804 N / mm at the point where “Loop” and 11.570 N / mm at the suture “X”.
Conclusion
The suture in “Loop” had a higher biomechanical behavior to the suture “X”, considering the Maximum Force and Tension.
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