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Study on the surface of the polymer insert of the knee replacement using pulsed thermography DOI:

  Providing of joint prostheses with high reliability is particularly important because the loss of their functional properties may cause invasive surgery revision. The main exploitation problems with prostheses are loosening (septic or aseptic) and the wear of inserts made of UHMWPE. Identification of the types and mechanisms of cooperating surfaces wear of the knee prostheses affects the improvement of materials selection, design and increase their reliability and durability. Typical kinds of damage of UHMWPE element of the prosthesis include abrasive wear, plastic deformation and creep, fatigue wear (pitting), changing the chemical composition and colour, changing in the structure, cracking. This paper presents the test results of the UHMWPE insert surface of the knee replacement which was used by the patient for 13 months. Microscopic studies, pulse thermography and 3D scanning of the UHMWPE insert were carried out. 3D scanning element has paved the way for reconstruction of the shape of the working surface of the insert of prosthesis. Surface defects in the tested insert were revealed by using innovative methods of pulsed thermography. In order to identify defects, located on the surface, microscopic studies were carried out. They have shown a complex mechanism of wear. Many signs of abrasive wear, fatigue wear (pitting) and microcracks have been observed. Analysis of the bio-bearing operation also indicates the signs of early fatigue wear. The causes of wear of tested elements include too high load applied exceeding several times the weight of the human body, closed space in which products of friction are accumulated. Key words: knee replacement, wear mechanisms, ultra-high molecular weight polyethylene.1. INTRODUCTION The knee joint is the most often undergoing traumatic damage and is the most susceptible to the occurrence of various types of pathologies in the human body. A deformation of the joint is caused by a degenerative disease a[...]

Badanie stanu powierzchni wkładki polimerowej endoprotezy stawu kolanowego metodą termografii impulsowej DOI:10.15199/28.2016.2.5

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1. CEL PRACY Celem pracy jest określenie charakteru uszkodzeń powierzchni wkładki endoprotezy stawu kolanowego wykonanej z PE-UHMW usuniętej reoperacyjnie z powodu obluzowania aseptycznego po 13 miesiącach użytkowania z wykorzystaniem nowoczesnych technik badania powierzchni materiału. 2. MATERIAŁ I METODYKA BADAŃ Przedmiotem badań była częściowo związana endoproteza stawu kolanowego (rys. 1) usunięta reoperacyjnie z powodu obluzowania aseptycznego po 13 miesiącach użytkowania. W celu przestrzennego odtworzenia kształtu powierzchni roboczej wkładki endoprotezy została ona zeskanowana za pomocą skanera SMARTTECH 3D. Ponieważ rozpraszająca promienie świetlne powierzchnia polietylen[...]

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