Orthopedics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Faculty of Biomedical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran.
BMC Musculoskelet Disord. 2022 Aug 17;23(1):785. doi: 10.1186/s12891-022-05746-3.
Joint replacement is one of the options to retrieve the interosseous distal radioulnar joint (DRUJ) function. DRUJ prosthesis has recently been introduced clinically to treat DRUJ instability. This article analyzes the biomechanical behavior of the prosthesis during different loadings by the finite element method.
CT images of a healthy 33 years old man were used to construct the three-dimensional geometry of the forearm bone. Then two models, a healthy foreman (Model A) and a damaged model with an inserted interosseous prosthesis (Model B), were constructed to analyze and compare the foreman's biomechanical behavior under different loading conditions using the finite element method. Both models were examined during pronation and supination with 500, 1000, 2000, and 5000 N.mm values. Also, both models were subjected to volar and dorsal loads with values of 10, 30, and 50 N and traction force with 100, 150, and 200 N.
Maximum and minimum principal stresses were evaluated for bones in all conditions, and von Mises stress was considered for the prosthesis and fixing screws. In supination, the maximum stress in Model A is significantly higher than the Model B. However, the maximum principal stress of both models is similar during volar and dorsal loading. In Model A, the maximum principal stress in traction is much smaller than in Model B. The absolute value of minimum principal stress in pronation and supination in Model B is higher than in Model A. The prostheses and screws are subjected to higher stresses during pronation than supination. Also, the amount of stress created in prostheses and screws during volar and dorsal loading is almost equal. In traction loading, screws are subjected to significantly high stresses.
Our study indicates that the interosseous DRUJ prosthesis can perform the foreman's normal daily activities. This prosthesis provides the ability similar to a normal hand.
IV.
关节置换是恢复骨间远侧桡尺关节（DRUJ）功能的选择之一。DRUJ 假体最近已被临床用于治疗 DRUJ 不稳定。本文通过有限元法分析了假体在不同载荷下的生物力学行为。
使用一名健康的 33 岁男性的 CT 图像构建前臂骨骼的三维几何模型。然后构建了一个健康的前臂模型（模型 A）和一个插入骨间假体的损伤模型（模型 B），以通过有限元法分析和比较两种模型在不同加载条件下的前臂生物力学行为。分别在旋前和旋后时对两种模型施加 500、1000、2000 和 5000 N.mm 值的载荷。还对两种模型施加了 10、30 和 50 N 的掌侧和背侧载荷以及 100、150 和 200 N 的牵引载荷。
评估了所有条件下骨骼的最大和最小主应力，以及假体和固定螺钉的 von Mises 应力。在旋后时，模型 A 的最大应力明显高于模型 B。然而，在掌侧和背侧加载时，两种模型的最大主应力相似。在模型 A 中，牵引时的最大主应力远小于模型 B。模型 B 中旋前和旋后的最小主应力绝对值高于模型 A。假体和螺钉在旋前时比在旋后时承受更高的应力。此外，在掌侧和背侧加载时，假体和螺钉产生的应力几乎相等。在牵引加载时，螺钉承受的应力明显较高。
我们的研究表明，骨间 DRUJ 假体可以完成前臂的正常日常活动。该假体提供了类似于正常手的功能。
IV。
