Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.
School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran.
BMC Musculoskelet Disord. 2021 Dec 20;22(1):1047. doi: 10.1186/s12891-021-04788-3.
Bone 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.
To 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.
The 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.
About 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.
骨与肌腱内固定技术(BASHTI)是一种用于前交叉韧带(ACL)重建的非植入式有机技术,具有一些临床优势,例如加速愈合过程,优于可植入技术。本研究旨在比较 BASHTI 技术与传统的干扰螺钉技术的力学性能。
为了研究力学性能,进行了 20 项体外实验。实验采用合成模拟骨和新鲜数字牛肌腱作为移植物。所有标本均进行了三个加载步骤,包括预加载、主循环和拔出加载。
采用 8mm 肌腱直径的干扰螺钉技术的力学特性,包括固定强度、平均循环刚度(ACS)和平均拔出刚度(APS),分别为 439±132N、10.3±5.3kN/mm 和 109±40N/mm。在使用 9mm 肌腱的情况下,采用干扰螺钉技术的固定强度、ACS 和 APS 分别为 549±87N、10.3±4.7kN/mm 和 91±13N/mm。同时,采用 8mm 肌腱的 BASHTI 技术的固定强度、APS 和 ACS 分别为 360±123N、3.3±0.6kN/mm 和 79±27N/mm,而采用 9mm 肌腱的固定强度、APS 和 ACS 分别为 278±103N、2.4±1.2kN/mm 和 111±40N/mm。
大约 50%的干扰螺钉样本表现出比 BASHTI 技术更好的力学性能,但在另一半样本中,差异不显著(N.S.)。然而,由于 BASHTI 技术的有机优势和较低的成本,它可以作为干扰螺钉技术的替代品,特别是在需要快速恢复的情况下。