Estimation of the primary stability of the press-fit and screwed-in acetabular components after hip joint arthroplasty

Authors

  • Oleg Loskutov
  • Nadiia Naumenko
  • Oleksandr Loskutov
  • Dmytro Syniehubov
  • Dmytro Gorobets
  • Kseniya Furmanova

DOI:

https://doi.org/10.15674/0030-59872017192-97

Keywords:

hip joint, arthroplasty, acetabular component, finite element method, stress-strain state

Abstract

Arthroplasty is one of the most common and effective treat­ments for degenerative diseases and injuries of the hip joint, but marked increase in the number of revision procedures asso­ciated with instability of the implant, including cups, and a pair of friction problems.

Objective: using biomechanical methods to evaluate the primary acetabular stability with screwing up and press-fit components.

Methods: to evaluate the stress-strain state and subchondral spongy tissues in the acetabular zone under load of 1000 H, developed a simplified design scheme of the hip joint and healthy model of «bone – cup – insert – head» implant using finite element method. Press-fit and that screwing up cups were studied.

Results: in healthy hip joint any stress concentrators are absent. Maximum values are 0.09 MPa stress-strain state on the strength of spongy bone tissue 12.17 MPa. The most strenous share of subchondral bone is part of the roof — 16.24 MPa for her strength of 150–200 MPa. If using press-fit cups revealed increasing tension of spongy tissue in 4 ÷ 5 times, and at the entrance to the subchondral acetabular zone — 2 ÷ 3 times. With the use of screw up cups t transferring the load on the pelvic bone closest to the healthy joint. Small lo­cal stress concentrators in the spongy tissue occur in the contact zone of the threaded subchondral and spongy tissue and at a dis­tance of 1mm their value is reduced by 2–3 times and does not exceed 0.3 MPa.

Conclusions: the use of screw up cup has ad­vantages, especially in osteoporosis, because after implantation load on the pelvic bone close to the stress-strain state of healthy hip joint.

References

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How to Cite

Loskutov, O., Naumenko, N., Loskutov, O., Syniehubov, D., Gorobets, D., & Furmanova, K. (2017). Estimation of the primary stability of the press-fit and screwed-in acetabular components after hip joint arthroplasty. ORTHOPAEDICS TRAUMATOLOGY and PROSTHETICS, (1), 92–97. https://doi.org/10.15674/0030-59872017192-97

Issue

No. 1 (2017)

Section

ORIGINAL ARTICLES

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Copyright (c) 2017 Oleg Loskutov, Nadiia Naumenko, Oleksandr Loskutov, Dmytro Syniehubov, Dmytro Gorobets, Kseniya Furmanova

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