Comparison of mechanical properties in interference screw fixation technique and organic anterior cruciate ligament reconstruction method: a biomechanical study

BMC Musculoskeletal Disorders

Mahmoud Chizari¹  Amirhossein Borjali²  Amir Nourani²  Hadi Moeinnia²  Narges Ghias²  Mahdi Mohseni²  Hossein Korani³ 

[1] Department of Engineering and Technology, University of Hertfordshire, College Lane Campus, AL10 9AB, Hatfield, UK;Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;

关键词: ACL reconstruction;    BASHTI technique;    Core bone;    Implant-less;    Interference screw;    Tensile test;   

DOI  :  10.1186/s12891-021-04788-3

来源: Springer

【 摘 要 】

BackgroundBone and Site Hold Tendon Inside (BASHTI) technique is an organic implant-less technique for anterior cruciate ligament (ACL) reconstruction with some clinical advantages, such as speeding up the healing process, over implantable techniques. The study aims to compare the mechanical properties of BASHTI technique with the conventional interference screw technique.MethodsTo investigate the mechanical properties, 20 in-vitro experimental tests were conducted. Synthetic dummy bone, along with fresh digital bovine tendons, as a graft, were used for experiments. Three loading steps were applied to all specimens, including a preconditioning, a main cyclic, and a pull-out loading.ResultsThe mechanical characters of an interference screw technique using an 8 mm tendon diameter, including fixation strength, average cyclic stiffness (ACS), and average pull-out stiffness (APS) were found to be 439 ± 132 N, 10.3 ± 5.3 kN/mm, and 109 ± 40 N/mm, respectively. In the case of an interference screw using a 9 mm tendon, the fixation strength, ACS, and APS were obtained 549 ± 87 N, 10.3 ± 4.7 kN/mm, and 91 ± 13 N/mm, respectively. In parallel, the fixation strength, APS, and ACS of BASHTI technique using an 8 mm tendon were 360 ± 123 N, 3.3 ± 0.6 kN/mm, and 79 ± 27 N/mm, respectively, while, for 9 mm tendon 278 ± 103 N, 2.4 ± 1.2 kN/mm, and 111 ± 40 N/mm, were reported for fixation strength, APS, and ACS respectively when BASHTI technique was used.ConclusionAbout 50% of interference screw samples showed superior mechanical properties compared to BASHTI technique, but in another half of the samples, the differences were not significant (N.S.). However, due to organic advantages of BASHTI technique and lower cost, it could be used as a substitute for interference screw technique, especially where fast recovery is expected.

【 授权许可】

CC BY