Hong Chih-Kai, Hsu Kai-Lan, Kuan Fa-Chuan, Wang Chi-Hsiu, Wang Ping-Hui, Su Wei-Ren
Department of Orthopaedic Surgery, National Cheng Kung University Hospital, School of Medicine, National Cheng Kung University, Tainan, Taiwan.
Department of Orthopaedic Surgery, National Cheng Kung University Hospital, School of Medicine, National Cheng Kung University, Tainan, Taiwan;Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.
Acta Orthop Traumatol Turc. 2020 May;54(3):305-310. doi: 10.5152/j.aott.2020.03.59.
The aim of this study was to biomechanically assess the effect of humeral-fenestration size in the Outerbridge-Kashiwagi arthroplasty on the ultimate failure load of the distal humerus in a synthetic bone model.
We biomechanically tested the influence of different humeral-fenestration sizes on the failure load of the distal humerus in Outerbridge-Kashiwagi arthroplasty. A total of 50 synthetic humerus models were divided into 5 groups based on the fenestration size: 10 mm, 12 mm, 15 mm, 18 mm, and 20 mm. All the samples were randomly assigned to receive either axial or anteroposterior (AP) loading and then loaded to failure at a rate of 2 mm/min on a material testing machine. The data regarding ultimate failure loads under the axial and AP loading were analyzed.
Under the AP loading, the mean ultimate failure loads of the 18 mm and 20 mm groups were lower than those of the other groups. Under the axial loading, the mean ultimate failure load of the 10 mm group was significantly greater than that of the 15 mm, 18 mm, and 20 mm groups. Additionally, the ultimate failure load of the 20 mm group was significantly lower than that of the 12 mm, 15 mm, and 18 mm groups.
The distal humeral fenestrations with a size greater than 18 mm may offer poor biomechanical properties in the Outerbridge-Kashiwagi ulnohumeral arthroplasty.
本研究旨在通过生物力学方法评估在合成骨模型中，Outerbridge-Kashiwagi人工关节置换术中肱骨开窗大小对肱骨远端极限破坏载荷的影响。
我们通过生物力学测试，研究了不同肱骨开窗大小对Outerbridge-Kashiwagi人工关节置换术中肱骨远端破坏载荷的影响。总共50个合成肱骨模型根据开窗大小分为5组：10毫米、12毫米、15毫米、18毫米和20毫米。所有样本随机分配接受轴向或前后（AP）加载，然后在材料试验机上以2毫米/分钟的速率加载至破坏。分析轴向和AP加载下的极限破坏载荷数据。
在AP加载下，18毫米和20毫米组的平均极限破坏载荷低于其他组。在轴向加载下，10毫米组的平均极限破坏载荷显著大于15毫米、18毫米和20毫米组。此外，20毫米组的极限破坏载荷显著低于12毫米、15毫米和18毫米组。
在Outerbridge-Kashiwagi尺肱关节置换术中，大于18毫米的肱骨远端开窗可能具有较差的生物力学性能。
