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Predisposition of Hip Prosthesis Component Positioning on Dislocation Risk: Biomechanical Considerations Based on

Maciej Kostewicz1, Marcin Zaczyk2, Grzegorz Szczęsny1

  • 1Department of Orthopedics and Traumatology of the Musculoskeletal System, Medical University of Warsaw, 02-091 Warsaw, Poland.

Journal of Clinical Medicine
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Summary

Accurate implant positioning in total hip arthroplasty (THA) is crucial for prosthetic stability. Deviations compromise biomechanical integrity, increasing dislocation risk, highlighting the need for precise surgical alignment.

Keywords:
dislocationfinite element methodnumerical analysistotal hip arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Medical Imaging Analysis

Background:

  • Total hip arthroplasty (THA) effectively treats hip disease but faces prosthetic dislocation.
  • Dislocation is a common complication impacting THA outcomes.
  • Understanding biomechanical factors influencing stability is essential.

Purpose of the Study:

  • To investigate the biomechanical effects of varying implant positions in THA.
  • To assess how acetabular cup and femoral stem alignment influence prosthetic stability.
  • To quantify the impact of malpositioning on hip joint mechanics.

Main Methods:

  • Developed a 3D finite element model (FEM) of the hip joint using CT data.
  • Simulated diverse implant configurations with variations in cup inclination, anteversion, stem depth, and offset.
  • Applied muscle forces for single-leg stance and calculated safety factors (SF) to assess mechanical performance.

Main Results:

  • Optimal positioning (45° inclination, 15° anteversion, standard offset, optimal depth) yielded high SF values (9-12), indicating low dislocation risk.
  • Malpositioned implants, especially with altered anteversion or offset, significantly reduced SF values (2-5).
  • Reduced SF was most pronounced in specific acetabular regions, suggesting localized stress concentration.

Conclusions:

  • Precise implant alignment is critical for biomechanical stability in THA.
  • Deviations from optimal positioning substantially increase dislocation risk.
  • Individualized preoperative planning and surgical navigation are recommended to improve THA outcomes.