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2 2010

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Badanie wpływu wzajemnego ustawienia elementów endoprotez stawu biodrowego na wybrane parametry procesu tarcia

Sulej-Chojnacka J., Rybak T., Markuszewski J., Woźniak W.

Obróbka Plastyczna Metali

2010

T. 21, nr 2

129-141

Całkowita wymiana stawu biodrowego jest obecnie wysoce skuteczną i efektywną metodą przywracania funkcjonowania tego stawu. Podstawową cechą, która powinna cechować sztuczne stawy jest ich stabilność. W artykule opisano wyniki badań wpływu wzajemnego ustawienia elementów endoprotezy stawu biodrowego na wybrane parametry procesu tarcia. Badaniom poddano dwie pary trące o różnych średnicach, wykonane z różnych materiałów. Eksperyment wykonano na zaprojektowanym i zbudowanym w Instytucie Obróbki Plastycznej w Poznaniu symulatorze do badań elementów endoprotez stawu biodrowego SBT-01. Praca wykonana została we współpracy z Kliniką Ortopedii Ogólnej, Onkologicznej i Traumatologii na Uniwersytecie Medycznym im. Karola Marcinkowskiego w Poznaniu.

Total hip replacement is very effective method in case of human joint functionality restoring. The most important property of artificial joints is their functional stability. Results of influence of reciprocal endoprosthesis components setting on chosen friction parameters are presented. Two friction couples with different diameter made of different materials has been tested. Experiment has been performed using hip endoprosthesis simulator SBT-01 designed and constructed in Metal Forming Institute hip endoprosthesis simulator SBT-01. Work was carried out in cooperation with General Orthopaedics, Oncology and Traumatology Clinic at Karol Marcinkowski Poznan University of Medical Sciences.

Material and tribological problems occurring during the design and utilisation of hip endoprostheses

Gierzyńska-Dolna M., Więckowski W., Wiśniewska-Weinert H.

Journal of Achievements in Materials and Manufacturing Engineering

2010

Vol. 43, nr 1

222-227

Purpose: The main goal of research is determination of the influence of frictional pair „endoprosthesis head - acetabular cup” material on frictional resistance and endoprostheses wear, and the stress distribution in the elements of “bone-cement-implant” system. Design/methodology/approach: In the paper new development directions in endoprostheses are discussed with respect to construction of “head-acetabular cup” system and endoprosthesis stem, and proper material selection. The tests were carried out using dedicated simulator of the hip endoprosthesis. A quantitative and qualitative analysis of wear products was carried out. The numerical calculations of stress state in “bone-cement-implant” system were performed using ADINA System. Additionally the impact of incorrect endoprosthesis setting (jaw angle of the stem and cup) on frictional moment was determined experimentally. The stress distribution, in particular parts of “bone-cement-implant” system for selected endoprosthesis stem constructions, was presented. Findings: Both the numerical calculations and tests carried out on the hip endoprosthesis simulator gave us many valuable information on frictional resistance value, wear mechanism and durability of new endoprostheses constructions. Research limitations/implications: Preservation of geometrical, material and tribological similarity to the natural joints is of great significance in design of hip endoprostheses. Despite significant progress in material engineering not all similarity conditions were achieved. The replacement of a specific bone structure and natural joint with polyurethane insert and metal elements (stem, head of endoprosthesis), i.e. materials with much higher modulus of elasticity, cause the significant increase of the “bone-cement-implant” system rigidity. Frictional and wear processes occurring in the moveable system: “head-acetabular cup” and the resulting low endoprosthesis durability pose a serious problem. Practical implications: Future development of endoprostheses alloplasty is determined by the progress in biotribology, especially frictional and wear tests of endoprostheses. Originality/value: The tests were carried out using the hip endoprosthesis simulator, which reflects processes occurring in natural joint.