Knee ligament injuries: biomechanics comparative study of two suturetechnique in tendon - analysis "in vitro" tendon of bovine Les es ligamentares do joelho: estudo biomecanico comparativo de duas técnicas de sutura em tend es: análise in vitro em tend es de bovinos

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 (r) 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 (r) 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. OBJETIVO: Avaliar e comparar o comportamento biomecanico de duas diferentes configura es de sutura, em "X" e em "La ada", no preparo dos tend es para reconstru o ligamentar no joelho. MéTODOS: Usaram-se tend es extensores digitais comuns bovinos que podem substituir os tend es flexores humanos em estudos experimentais de tra o. No primeiro grupo, ponto em "X", a sutura com fio Ethibond(r) no 5 iniciou-se na por o distal do enxerto, com pontos transfixantes e com espa amento entre os pontos de 7,5 mm até alcan ar 3 cm distal ao início da sutura, retornando a sutura da mesma maneira, transfixando o tend o nos espa os livres e cruzando a sutura em configura o de "X". O segundo grupo, ponto em "La ada", foi preparado com o mesmo tipo de fio Ethibond(r) no 5, a agulha do fio foi retirada para uso somente do fio, que foi montado de maneira dupla em uma agulha avulsa formando um la o. Iniciou-se a sutura a 3 cm da extremidade do enxerto por meio de la adas e pontos transfixantes em toda a substancia do tend o, co