New concept in durability improvement of hip total joint endoprostheses

• Autorzy: Capitanu L. , Florescu V. , Badita L.-L.

Identyfikatory

DOI

10.5277/abb140110

• Języki publikacji: EN

Abstrakty

EN

Starting from the well-known fact that the rolling movement always has a lower friction compared to sliding friction, the authors have conceived and realized a pivoting movement joint on a “layer of balls” with “compensation space”, placed between the acetabular cup and the femoral head. This technical solution allows free self-directed migration of the balls, depending on the resistance opposed, with successive occupation of the “compensation space”. As a concept, the proposed technical solution excludes the existence of a cage for maintaining the relative positions of the spheres. It can be observed that the smallest values of the force and of the friction coefficient are obtained for the prostheses with balls and self-directed movement (approximately 5 times smaller than the values obtained for a classical prosthesis). For all the couples tested, the friction force grows with the growth of the normal load and of the oscillation speed. Changing the contact mechanism for the artificial hip joint from one sliding contact between two large surfaces, to a multitude of rolling contacts, could lead to some problems regarding functionality and durability of the active prosthesis elements. The key to an accurate evaluation of damaging mechanisms acting on THP with self directed rolling balls is a clear and complete picture of the load transfer mechanism.

Słowa kluczowe

EN

total hip prostheses; rolling bodies; MOM prostheses; self-directed movement

PL

endoproteza stawu biodrowego; biomateriały; samoprzemieszczanie; zużycie materiału

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2014
• Tom: Vol. 16, no. 1
• Strony: 75--82
• Opis fizyczny: Bibliogr. 10 poz., rys., tab., wykr.

Twórcy

autor

Capitanu L.

• Institute of Solid Mechanics of Romanian Academy, Bucharest, Romania

autor

Florescu V.

• Technical University of Civil Engineering Bucharest, Romania

autor

Badita L.-L.

• National Institute for Research and Development in Mechatronics and Measurement Technique, Bucharest, Romania

Bibliografia

• [1] KATSUTASHI B., KIYOSHI S., Artificial Joint. U.S.Patent 5092898/0303, 1992.
• [2] DAVANT J.P., Chirurgie de la hance. Mieux vivre avec une prosthesis, Fonder l’Avenir, 1995, Vol. 23, 53–56.
• [3] SADEGHI-MEHR M., Investigations of Rolling Element Bearing for Hip Joint Prosthesis, PhD Thesis, Imperial College of Science, Technology and Medicine University, London, 1997.
• [4] CAPITANU L., FLORESCU V., PETRESCU F., Tribological Aspects of Wear of Hip Joint Prosthesis, The First Mediterranean Tribology Conference, Jerusalem, 2000, 7/1–7/5.
• [5] IAROVICI A., CAPITANU L., FLORESCU V., BAUBEC M., Hip Joint Prosthesis with rolling bodies, Proceedings of the Romanian Academy – Series A: Mathematics and Physics, Technical Sciences, Information Science, 2001, Vol. 1(1–2), 37–44.
• [6] IAROVICI A., CAPITANU L., FLORESCU V., BAUBEC M., PETRESCU F., Hip Joint Prosthesis with Rolling Bodies, Part I – The Balls Arrangement Analysis, Proceedings of the Annual Symposium of the Institute of Solid Mechanics – SISOM 2001, 251–258.
• [7] IAROVICI A., CAPITANU L., FLORESCU V., BAUBEC M., PETRESCU F., Hip Joint Prosthesis with Rolling Bodies, Part II – Numerical and Graphical Examples, Proceedings of the Annual Symposium of the Institute of Solid Mechanics SISOM 2001, 259–263.
• [8] IAROVICI A., CAPITANU L., ONISORU J., FLORESCU V., BAUBEC M., Stresses and deformations analysis for Hip Joint Prostheses with rolling bodies, Proceedings of the Annual Symposium of the Institute of Solid Mechanics SISOM 2002, 263–268.
• [9] CAPITANU L., FLORESCU V., Recent Developments for Improved Durability of MOM Total Hip Endoprostheses – A Review, Am. J. Mater. Sci., 2013.
• [10] JOHNSON K.L., Contact Mechanics, Cambridge University Press, 1985.