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

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Revista Brasileira de Ortopedia 2020年第6期55卷 771-777页

作者： Dobke, Lothar Schmechel Bonadiman, João Artur Lopes, Osmar Valadão Saggin, Paulo Renato Israel, Charles Leonardo Spinelli, Leandro De Freitas Knee Surgery Service Instituto de Ortopedia e Traumatologia (IOT) Hospital São Vicente de Paulo (HSVP) Universidade Federal da Fronteira sul (UFFS) Passo Fundo RS Brazil Orthopedics and Traumatology Service Santa Casa de Misericórdia de Porto Alegre Rs Universidade de Passo Fundo RS Brazil Department of Mechanical Engineering Universidade de Passo Fundo Passo Fundo RS Brazil Graduate Program in Design and Manufacturing Processes Universidade de Passo Fundo Passo Fundo RS Brazil Department of Surgical Clinic Universidade Federal de Ciências da Saúde de Porto Alegre Porto Alegre RS Brazil

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. © 2020 Georg Thieme Verlag. All rights reserved.

关键词： animal models biomechanical phenomena joint ligaments orthopedic fixation devices patellofemoral joint suture technique

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