A Pilot Biomechanical Study to Evaluate the Efficiency of New Implant to Fix Acromioclavicular Joint

IF 4.5 Q1 EDUCATION & EDUCATIONAL RESEARCH

Techniques in Shoulder and Elbow Surgery Pub Date : 2020-05-08 DOI:10.1097/BTE.0000000000000192

H. Namazi, Keramat Askari, Mohammad T Karimi, M. Fereidooni

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Abstract

The incidence of acromioclavicular joint (ACJ) injuries is high in daily activities and sports. Various surgical procedures have been used to restore the performance of the shoulder complex in ACJ injuries. This study was aimed to introduce a new implant designed to fix ACJ and to evaluate its efficiency on the basis of biomechanical modeling and finite element analysis approaches. Computerized tomography scan images of 12 normal shoulders were selected to create a 3d model of shoulder joints. The dimensions of the implant were obtained from the models of shoulder joints and then were evaluated on 5 fresh cadavers. The stress developed in the implant and shoulder articular surfaces were evaluated by finite element analysis on the basis of the models obtained from computerized tomography scan images. The designed implant can be used to fix ACJ for both right and left sides. The stress developed in the implant varied between 1.88 and 2.1 MPa. The newly designed implant can be used for most of the subjects to fix ACJ for both rights and left sides. The stress developed in the implant in the abduction of the shoulder joint was significantly less than the yield strength of the material used for the implant. Therefore, it can be used without failure for most of the daily activities.

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评价新型肩锁关节植入物固定效果的初步生物力学研究

肩锁关节（ACJ）损伤在日常活动和运动中发生率较高。各种外科手术已被用于恢复ACJ损伤中肩部复合体的性能。本研究旨在介绍一种用于固定ACJ的新型植入物，并在生物力学建模和有限元分析方法的基础上评估其效率。选择12个正常肩部的计算机断层扫描图像来创建肩部关节的三维模型。从肩关节模型中获得植入物的尺寸，然后在5具新鲜尸体上进行评估。基于从计算机断层扫描图像中获得的模型，通过有限元分析来评估植入物和肩部关节表面中产生的应力。所设计的植入物可用于固定左右两侧的ACJ。植入物中产生的应力在1.88和2.1之间变化 MPa。新设计的植入物可用于大多数受试者固定左右侧ACJ。在肩关节外展的植入物中产生的应力明显小于用于植入物的材料的屈服强度。因此，它可以毫无故障地用于大多数日常活动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Techniques in Shoulder and Elbow Surgery ORTHOPEDICS-

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期刊介绍： Published quarterly, Techniques in Shoulder & Elbow Surgery escorts the reader into the operating room and supplies step-by-step details of exciting and advanced techniques. It explains the evolution of and rationale for the procedures, identifies the pitfalls and possible complications, provides invaluable tips for improving surgical results and it is illustrated cover to cover with high-quality intraoperative photographs and drawings, many in full color.