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CC BY-NC-ND 4.0 · Rev Bras Ortop (Sao Paulo) 2020; 55(06): 771-777
DOI: 10.1055/s-0040-1708520
Artigo Original
Joelho

Biomechanical Study of Different Femoral Fixation Devices in the Reconstruction of the Medial Patellofemoral Ligament in Porcine Knees[*]

Article in several languages: português | English
Lothar Schmechel Dobke 
1   Serviço de Cirurgia do Joelho, Instituto de Ortopedia e Traumatologia (IOT), Hospital São Vicente de Paulo (HSVP), Universidade Federal da Fronteira Sul (UFFS), Passo Fundo, RS, Brasil
,
João Artur Bonadiman 
1   Serviço de Cirurgia do Joelho, Instituto de Ortopedia e Traumatologia (IOT), Hospital São Vicente de Paulo (HSVP), Universidade Federal da Fronteira Sul (UFFS), Passo Fundo, RS, Brasil
,
Osmar Valadão Lopes Jr 
1   Serviço de Cirurgia do Joelho, Instituto de Ortopedia e Traumatologia (IOT), Hospital São Vicente de Paulo (HSVP), Universidade Federal da Fronteira Sul (UFFS), Passo Fundo, RS, Brasil
,
Paulo Renato Saggin 
1   Serviço de Cirurgia do Joelho, Instituto de Ortopedia e Traumatologia (IOT), Hospital São Vicente de Paulo (HSVP), Universidade Federal da Fronteira Sul (UFFS), Passo Fundo, RS, Brasil
,
Charles Leonardo Israel 
3   Departamento de Engenharia Mecânica, Universidade de Passo Fundo, Passo Fundo, RS, Brasil
4   Programa de Pós-Graduação em Projeto e Processos de Fabricação, Universidade de Passo Fundo, Passo Fundo, RS, Brasil
,
Leandro de Freitas Spinelli 
2   Serviço de Ortopedia e Traumatologia, Santa Casa de Misericórdia de Porto Alegre, RS, Brasil
3   Departamento de Engenharia Mecânica, Universidade de Passo Fundo, Passo Fundo, RS, Brasil
4   Programa de Pós-Graduação em Projeto e Processos de Fabricação, Universidade de Passo Fundo, Passo Fundo, RS, Brasil
5   Departamento de Clínica Cirúrgica, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil
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Abstract

Objective To evaluate different femoral fixation devices for medial patellofemoral ligament reconstruction and compare their effectiveness regarding fixation strength up to failure in porcine knees.

Methods Thirty porcine knees were used, divided into three groups of 10 knees. The removed grafts were dissected from the extensor tendons of porcine feet. In each group, the graft was fixed to the femur with an interference screw, an anchor, or adductor tenodesis. The three methods were subjected to biomechanical tests using a universal Tensile testing machine at a speed of 20 mm/minute.

Results The highest average linear resistance under lateral traction occurred in group 1, “screw fixation” (185.45 ± 41.22 N), followed by group 2, “anchor fixation” (152.97 ± 49, 43 N); the lower average was observed in group 3, “tenodesis fixation” (76.69 ± 18.90 N). According to the fixed error margin (5%), there was a significant difference between groups (p < 0.001); in addition, multiple comparison tests (between group pairs) also showed significant differences. Variability was small, since the variance coefficient was lower than 33.3%.

Conclusion Interference screws in bone tunnels and mountable anchors fixation with high resistance wire are strong enough for femoral fixation in porcine medial patellofemoral ligament reconstruction. Adductor tenodesis, however, was deemed fragile for such purpose.

Keywords

biomechanical phenomena - joint ligaments - animal models - patellofemoral joint - suture technique - orthopedic fixation devices

* Work performed at Hospital São Vicente de Paulo (HSVP-RS), Instituto de Ortopedia e Traumatologia de Passo Fundo (IOT-RS) and Laboratory of Bioengineering, Biomechanics and Biomaterials at the Universidade de Passo Fundo (UPF).




Publication History

Received: 08 October 2019

Accepted: 12 December 2019

Article published online:
22 July 2020

© 2020. Sociedade Brasileira de Ortopedia e Traumatologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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