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

Krzywicka M., Grudziński J., Tatarczak J., Ścibisz P.

Inżynieria Materiałowa

2016

Vol. 37, nr 2

76--80

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.

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.

Types of wear and tear of biomaterials used in orthopaedic surgery

Klimek L., Wołowiec E., Majkowska B.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 56, nr 2

83--89

Purpose: Purpose of this paper is presentation of observations on different kinds of wear and tear of biomaterials used in contemporary orthopaedic surgery. Design/methodology/approach: Types of prosthesis damage, encountered in medical practice, and their causes have been described. Results of many clinical studies were analysed to review prosthesis damage from the stage of implanting (such as intrusion of a foreign object between its components) to their natural wear and tear after many years of use (abrasive wear, biological corrosion). Findings: It has been shown that prostheses heads may also succumb to quick wear and tear despite being made of harder and more durable materials than sockets. Research limitations/implications: Clinical and laboratory of defective implants discover the reasons of damage, but they are time consuming. There are also difficulties in obtaining objects for research. Originality/value: The research has helped to systematise the knowledge on the mechanisms of wear and damage of endoprostheses, which is vital for improvement of their life cycle.