DOI: https://doi.org/10.22141/1608-1706.2.20.2019.168021

Grounding threaded element shape of the acetabular component of total hip endoprosthesis

A.E. Loskutov, S.V. Panchenko, A.E. Oleynik, E.A. Kovbasa, A.V. Gubarik

Abstract


Background. Acetabular reconstruction with threaded cups remains promising in achieving long-term stability of the implant both in cases of complicated and revision total hip replacements. Nevertheless, the causes of cup instability still remain unclear that makes biomechanical research of “endoprosthesis/bone” microinteractions of great interest. The purpose was to determine optimal parameters of threaded element geometry of threaded acetabular component of total hip endoprosthesis. Materials and methods. Finite element models were created, they varied in terms of cup threaded element geometry (model 1 — threaded element with right-angled triangle transverse section resting upon the bone with its hypotenuse; model 2 — threaded element with right-angled triangle transverse section resting upon the bone with its cathetus; model 3 — threaded element with isosceles triangle transverse section resting upon the bone with one of its equal sides) and cup cone inclination angle (with the angle range of 0–15°). Maximal tensile forces in bone were determined as the criteria for effectiveness. The research was conducted with ANSYS software package. Results. It was found that threaded element model with right-angled triangle transverse section resting upon the bone with its cathetus seems to be the most effective in terms of local tension distribution in “the cup/bone” interspace. This result is valid both for conditions when the cup cone is/isn’t resting upon bone. Increasing the cup cone inclination angle up to 15° led to multidimensional changes in bone stress strain state: increasing peak forces in model 2 and model 3 and decreasing in model 1 (the triangle leans on the bone with its hypotenuse). Additionally, the influence of the cup cone inclination degree on the stress strain state was evaluated for the model 1. So, the least peak forces for the threaded element with right-angled triangle transverse section res-ting upon the bone with its hypotenuse were assessed with cup cone inclination angles of 5–15°. Revealed qualitative patterns of pelvic bone stress strain state during implantation represent heterogeneity and require further research. Conclusions. Threaded cup geometry grounding should be implemented through the assessment of biomechanical interactions of “the cup/bone” interspace. It was found that threaded element model with right-angled triangle transverse section seems to be the most effective that is advisable to take into conside-ration when choosing acetabular components.

Keywords


hip joint; endoprosthesis; acetabular component; threaded element; finite element method; stress strain state

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