TESTING THE COBALT ION EMISSION ON THE STAND FOR DIFFERENT ANGLES OF POSITIONING THE COMPONENTS OF THE METAL–METAL HIP JOINT ENDOPROSTHESIS

Tribologia ◽  
2021 ◽  
Vol 297 (3) ◽  
pp. 57-64
Author(s):  
Tomasz Wiśniewski ◽  
Michał Libera

The paper deals with the subject related to the assessment of the influence of the axis angle of the metal components of the hip joint on the emission of cobalt ions. The tribological tests were carried out with the use of a simulator for the examination of hip joint endoprostheses, the structure of which enables the fixation of endoprosthesis components in accordance with the anatomical structure of the human hip joint. During the tests, the simulator performs flexion and extension movements as well as loads occurring in the human hip joint while walking. Loss-wear tests were carried out for nine variants of the “head–cup” system settings. These settings were determined on the basis of CT images obtained from patients after arthroplasty. After the tribological tests were completed, samples of the lubricating fluid with the wear products suspended in it were collected in order to determine the concentration of cobalt ions, which was carried out using the atomic absorption spectrometry method. As a result, the influence of the head antetorsion angle (α) and the acetabular anteversion angle (β) on the concentration of cobalt ions was analysed.

2001 ◽  
Vol 218-220 ◽  
pp. 601-604 ◽  
Author(s):  
Hans Georg Neumann ◽  
Axel Baumann ◽  
G. Wanke ◽  
K.J. Hamelynck ◽  
M. Morlock

2007 ◽  
Vol 40 ◽  
pp. S558 ◽  
Author(s):  
V. Fuis ◽  
T. Návrat ◽  
P. Hlavon ◽  
M. Koukal ◽  
M. Houfek

2006 ◽  
Vol 326-328 ◽  
pp. 735-738 ◽  
Author(s):  
Sung Jae Kang ◽  
Jei Cheong Ryu ◽  
Gyoo Suk Kim ◽  
Mu Seong Mun

In this study, we developed a fuzzy-logic-controlled PGO (Power Gait Othosis) that controls the flexion and extension of each PGO joint using bio-signals and an FSR sensor. The PGO driving system works to couple the right and left sides of the orthosis by specially-designed hip joints and pelvic section. This driving system consists of the orthosis, sensor, and control system. An air supply system for muscle action is composed of an air compressor, 2-way solenoid valve (MAC, USA), accumulator and pressure sensor. The role of this system is to provide constant “air muscle” with compressed air at the hip joint. With the output signal of the EMG and foot sensors, air muscles assist the flexion of the hip joint during the PGO gait.


2006 ◽  
Vol 40 (6) ◽  
pp. 301-303 ◽  
Author(s):  
N. K. Sherepo ◽  
K. M. Sherepo

2016 ◽  
Vol 687 ◽  
pp. 111-116
Author(s):  
Marcin Nabrdalik ◽  
Michał Sobociński

The paper presents the results of tribological tests on titanium alloys subjected to modification of surface layer. The tests were conducted with metal biomaterials coated with TiN layer and anodized, applied in knee and hip joint endoprostheses. One of the ways of improving abrasion resistance of metal and polyethylene elements of endoprostheses is TiN coating by means of PVD method. It results in getting the metal of high bio-compatibility and more friction resistant. The research were carried out for various friction pairs applied in total knee and hip joint endoprostheses.


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