LUCIANA BOSTAN, FLORIN MUNTEANU, MARCEL IONEL POPA, LILIANA VERESTIUC<br>Preliminary Studies on Fatigue Analysis of Hydrogels Based on p(HEMA)

LUCIANA BOSTAN, FLORIN MUNTEANU, MARCEL IONEL POPA, LILIANA VERESTIUC
Preliminary Studies on Fatigue Analysis of Hydrogels Based on p(HEMA)

Abstract:

Current surgical implants such as artificial hip and knee joints undergo degradation after 10-15 years of use. Despite the success of surgical implants materials used in these procedures still do not satisfy the demands of a durable functioning joint. The most common causes of implant failure have been and still are stem loosening and wear between the stem and socket. A concept of creation of a polymeric insert for hip joint endoprostheses with the physiological and biomechanical properties typical of natural cartilage is proposed. Synthetic hydrogels based on poly (2-hydroxyethyl methacrylate) (pHEMA) have been investigated for use as such synthetic compliant materials. The paper presents the experimental results about mechanical properties, substrate wear by fatigue analysis and elastic modulus values, of poly(HEMA) hydrogels by comparison with articular cartilage. The influence of a highly hydrophilic monomer (acrylic acid - AA), included by co-polymerization into hydrogels structure, on their mechanical properties were analyzed. In order to simulate the physiological conditions, static and dynamic mechanical tests were carried out in physiological salt solution (0.9%NaCl) and using the same geometry of a hip joint implant. Keywords: articular cartilage; poly(HEMA); static and dynamic mechanical tests; total hip prosthesis (THP)

Issue: 2010, Volume 61, Issue 12

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