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The research was financed in the framework of the project Lublin University of Technology
Excellence Initiative, Regional funded by the Polish Ministry of Science and Higher Education
(contract no. 030/RID/2018/19).
The purpose is to analyze the influence of the elastic characteristics of the materials of the tribological pair: ac-
etabular–femoral head on the maximum pressures in the hip joint endoprosthesis. The paper analyzes the impact of
elasticity characteristics (i.e. E and ν) on the contact parameters of a tribological pair (maximum contact pressure
and contact angle), which is a hip endoprosthesis. The analysis was made on the basis of the author’s calculation
method. The study determined the value of contact pressures depending on the changes in the elastic characteris-
tics of UHMW-PE and changes in the geometry of the tribological pair (variable radii of the Grade2TDN head and
the UHMW-PE acetabulum). It was noticed that increasing E modulus of UHMW-PE increases its stiffness, which
causes a noticeable increase in contact pressures in the endoprosthesis. The quantitative and qualitative regularities
of this impact were determined. The developed method allows for earlier estimation of contact pressures depend-
ing on the external load (patient’s body weight), and geometric parameters of the artificial hip joint (diameter of
the endoprosthesis head and the acetabulum). This allows you to make a personalized endoprosthesis resistant to
damage. It is very important in modern medicine because life expectancy in developed countries is longer and the
durability of endoprostheses should be 10–12 years. Hospital statistics show that the need for total hip replacement
concerns even younger people. Implantation of a hip joint prosthesis is an invasive and costly procedure, hence
the need to produce prostheses with a long service life (over 15–20 years) before re-arthroplasty. The obtained test
results showed that the use of an endoprosthesis cup made of UMHW-PE with higher stiffness (high E1 value and
low × value) results in an increase in maximum contact pressures p(0). Increasing the Poisson’s ratio in the tested
range causes an increase in the contact pressure p(0) even 1.1 times. Increasing the diameter of the head of the D2
endoprosthesis decreases the contact pressure by an average of 2.32 times. On the other hand, a change in the radial
clearance e in the tribological pair of the hip endoprosthesis from 0.1 mm to 0.2 mm causes an increase in contact
pressures by an average of 1.35 times.
