Investigation of Contribution of Design to the High Fracture Rate of Long Neck Ceramic Femoral Head Prosthesis by Finite Element Analysis

Year 2020, , 415 - 422, 26.05.2020

Mustafa Ünal

https://doi.org/10.21541/apjes.579931

Abstract

Having a superior wear resistance, ceramics have been among the best options of material for femoral head prosthesis of young patients. However, the inherent disadvantage of ceramics is their brittleness. Therefore, the production and design factors of ceramic femoral heads should be considered carefully. Otherwise, it may cause more serious problem such as in the example of recalling event of ceramic femoral heads by Saint Gobain Advanced Ceramics in 2001 due to the high fracture rate. Although the high fracture rate of these recalled ceramics heads were primarily associated with an alteration in a manufacturing process, why the long neck designed ceramic heads produced in the same batch had higher fracture rate compared to short neck designed ceramic heads have not been fully identified. In subsequent discussions, design factor leading to a biomechanical insufficiency of long neck ceramic heads was considered as a possible explanation of the high fracture rate. The purpose of this study was to analyze the stress distribution on two different ceramic femoral heads (short and long neck ceramic heads) using finite element analysis to identify the possible contribution of design factor to the higher fracture rate of long neck ceramic femoral heads. These two different designed ceramic heads with the same diameter were analyzed in a femur under walking conditions. The results showed higher local stress concentration which may lead to a fatigue fracture over time on the taper-bore contact area of long neck ceramic head, suggesting that design factor may also contribute to the higher fracture rate of long neck ceramic heads beyond manufacturing defect. Therefore, the presence of such local stress concentration areas on ceramic heads related to design factors should always be taken into account during the design and manufacture of the new ceramic femoral heads.

Keywords

Biomechanics, Ceramic Femoral Head, Femur, Finite Element Analysis, Hip prosthesis

Tasarımın Uzun Boyun Seramik Femoral Baş Protezinin Yüksek Kırılma Oranına Katkısının Sonlu Elemanlar Analizi ile Araştırılması

Abstract

Üstün aşınma direncine sahip olan seramikler, genç hastaların femur başı protezi için en iyi malzeme seçeneklerindendir. Bununla birlikte, seramiklerin doğal dezavantajları kırılganlıklarıdır. Bu nedenle, seramik femur başlarının üretim ve tasarım faktörleri dikkatlice düşünülmelidir. Aksi takdirde, yüksek kırılma oranına bağlı olarak, 2001 yılında Saint Gobain Advanced Ceramics tarafından seramik femoral kafaların geri çağrılması olayında olduğu gibi daha ciddi bir soruna neden olabilir. Her ne kadar geri çağrılan bu seramik başların yüksek kırılma oranları, temel olarak imalat işlemindeki bir değişiklikle ilişkilendirilmiş olsa da, aynı partide üretilen uzun boyun tasarımlı seramik başların neden kısa boyun tasarımlı seramik başlara göre daha yüksek kırılma oranına sahip oldukları tam olarak tespit edilememiştir. Daha sonraki tartışmalarda, uzun boyunlu seramik başların biyomekanik yetersizliğine yol açan tasarım faktörü yüksek kırılma oranının olası bir açıklaması olarak değerlendirilmiştir. Bu çalışmanın amacı, tasarım faktörünün uzun boyunlu seramik femoral başlarının daha yüksek kırılma oranına olası katkısını belirlemek için sonlu elemanlar analizi kullanılarak iki farklı seramik femur başı (kısa ve uzun boyunlu seramik baş) üzerindeki gerilme dağılımının analizini yapmaktır. Aynı çaptaki bu iki farklı şekilde tasarlanmış seramik başlar, yürüme koşulları altında bir femur içinde analiz edildi. Sonuçlar, uzun boyunlu seramik başın konik-delik temas bölgesinde zaman içinde yorulma kırılmasına yol açabilecek yüksek lokal stres yoğunlaşmasının varlığını göstermiştir, bu da tasarım faktörünün, üretim kusurunun ötesinde uzun boyunlu seramik başların daha yüksek kırılma oranına katkıda bulunabileceğini göstermektedir. Bu nedenle, tasarım faktörleriyle alakalı olan seramik başlar üzerindeki bu tür lokal stres yoğunlaşma alanlarının varlığı, yeni seramik femur başlarının tasarımı ve üretimi sırasında daima dikkate alınmalıdır.

Keywords

Biyomekanik, Seramik Femoral Baş, Femur, Sonlu Elemanlar Analizi, Kalça Protezi

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