Erkan BAHÇE, Ender EMİR, Mehmet Sami GÜLER

Diz Eklem Protezlerinde Kullanılan UHMWPE Insert Bileşeni için Aşınma Durumunun Diz Eklem Protezi Aşınma Test Simülatörü İle İncelenmesi

Günümüzde bireylerin diz ekleminde trafik kazaları, spor yaralanmaları ve kıkırdak yapısında meydana gelen deformasyon sonucunda cerrahi operasyonlarda diz eklem protezleri yoğun olarak kullanılmaktadır. Ancak kullanım şartlarına bağlı olarak protez bileşenlerinde oluşabilecek hataların belirlenebilmesi gerekmektedir. Bu çalışmada kullanım esnasında diz eklem protez bileşenlerinden biri olan yüksek moleküler yoğunluklu ultra hafif polietilen (UHMWPE) insert bileşeninde meydana gelen hata durumlarının gözlemlenebilmesi amaçlandı. Bu nedenle diz simülatörü ile aşınma testi 1x106, 2x106 ve 3x106 olmak üzere üç farklı çevrim sayısında gerçekleştirildi. Testlerin sonunda UHMWPE insert medial ve lateral kondillerden mikroskop görüntüleri ve kütle kaybı ölçümleri alındı. Elde edilen bulgularda çevrim sayısının artışına bağlı olarak UHMWPE insert bileşeni üzerinde farklı eksenlerdeki tekrarlı kuvvetler sonucunda çukurcuk aşınmalarının, kılcal çatlakların, çiziklerin, yığılmış partiküllerin ve kütle kayıplarının belirgin bir şekilde oluştuğu görüldü.

Anahtar Kelimeler:

Diz Eklem Protezi, Kütle Kaybı, UHMWPE Insert, Yüzey kalitesi

Investigation of the Wear Condition for the UHMWPE Insert Component Used in Knee Joint Prosthesis with Knee Joint Prosthesis Wear Test Simulator

Today, knee joint prosthesis is used extensively in surgical operations as a result of traffic accidents, sports injuries and in the deformation of the cartilage structure in the knee joint of individuals. However, depending on the conditions of use, it is necessary to determine the defects that may occur in the prosthetic components. In this study, it is aimed to observe the error mechanisms of ultra high molecular weight polyethylene (UHMWPE) insert component which is one of the knee joint prosthesis components during use. Therefore, the wear test with knee simulator was carried out in three different cycles; 1x106, 2x106 and 3x106. At the end of the tests, microscop images and mass loss measurements were taken from the medial and lateral condyles of the UHMWPE insert. According to the results, it is seen that due to the increase in the number of cycles, it is seen that pitting wear, capillary cracks, scratches, agglomerated particles and mass losses occur as a result of repetitive forces on different axes on UHMWPE insert component.

Keywords:

Knee Joint Prosthesis, Mass Loss, UHMWPE Insert, Surface Quality,

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