An Investigation of Four-Point Bending Behavior for Personalized Humerus Bone Plate

Abstract

The reverse engineering method has been beneficial for personalized implant designs in the medical field due to its flexible use feature that allows it to be applied in many areas. The method of anatomical features (MAF) is commonly used for fractures of the bone for the development of plate fixation. To improve the geometrical fitting between plate and bone, high-quality image data is the most important factor for computer aided design (CAD ) modelling. This study aims to use MAF for humerus bone plate design that would alternate the fracture region and decrease the stress-shielding effect depending on bending strength. For this purpose, the personalized plate implant (PPI) was designed according to MAF and fabricated using the multi jet fusion (MJF) technique, finally the four-point bending finite element analysis was applied and tested. The results indicated that the PPI structure has higher bending strength than the flat plate design and a much greater surface area.

Keywords

• Bone plates
• Method of anatomical features
• Four-point bending tests
• Personalized bone plate

Kişiselleştirilmiş Humerus Kemik Plakasının Dört Nokta Eğilme Davranışının İncelenmesi

Öz

Tersine mühendislik yöntemi, birçok alanda uygulanmasına olanak sağlayan esnek kullanım özelliği nedeniyle tıp alanında kişiye özel implant tasarımlarında fayda sağlamıştır. Anatomik özellikler yöntemi (MAF), plak fiksasyonunun geliştirilmesi için kemik kırıklarında yaygın olarak kullanılır. Plaka ve kemik arasındaki geometrik uyumu iyileştirmek için yüksek kaliteli görüntü verileri CAD modellemede en önemli faktördür. Bu çalışma, kırık bölgesini değiştirecek ve bükülme mukavemetine bağlı olarak stres koruyucu etkiyi azaltacak humerus kemik plakası tasarımı için MAF'ın kullanılmasını amaçlamaktadır. Bu amaçla kişiselleştirilmiş plaka implant (PPI), MAF'a göre tasarlanıp, multi jet füzyon (MJF) tekniği kullanılarak üretildi, son olarak dört nokta bükme sonlu elemanlar analizi uygulanarak test edildi. Sonuçlar, PPI yapısının düz plaka tasarımına göre daha yüksek bükülme mukavemetine ve çok daha büyük bir yüzey alanına sahip olduğunu göstermiştir..

Anahtar Kelimeler

• Kemik plakaları
• Anatomik özellikler yöntemi
• Dört nokta eğilme testleri
• Kişiselleştirilmiş kemik plakası

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