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Microstructural Analysis of Fractured Orthopedic Implants.

Mateusz Kopec1,2, Adam Brodecki1, Grzegorz Szczęsny3

  • 1Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02106 Warsaw, Poland.

Materials (Basel, Switzerland)
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PubMed
Summary

Orthopedic implant fractures, including titanium and steel devices, are often caused by excessive mechanical loads and fatigue, exacerbated by patient weight and activity. Current implant designs may not adequately withstand these forces.

Keywords:
medical fixation devicesmicroscopic fracture analysisorthopedic prostheses and implantsstainless steeltitaniumtitanium alloy

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Area of Science:

  • Biomaterials Science
  • Orthopedic Engineering
  • Failure Analysis

Background:

  • Orthopedic implants are crucial for restoring function but are susceptible to fracture.
  • Understanding implant failure mechanisms is vital for improving patient outcomes and device longevity.
  • Previous studies have highlighted various causes of implant failure, necessitating detailed analysis of specific geometries and materials.

Purpose of the Study:

  • To investigate the fracture behavior of diverse orthopedic implants (titanium and steel) used in the human body.
  • To identify the primary causes of implant fracture through detailed examination.
  • To assess the adequacy of current orthopedic implant designs in managing mechanical loads.

Main Methods:

  • Fracture analysis of four distinct orthopedic implants: pure titanium locking plate, pure titanium femoral implant, Ti-6Al-4V titanium alloy pelvic implant, and X2CrNiMo18-14-3 steel femoral implant.
  • Utilized scanning electron microscopy (SEM) to examine fracture surfaces and determine failure origins.
  • Correlated observed fracture patterns with clinical data on patient loading conditions and activities.

Main Results:

  • All studied implants exhibited fracture in vivo.
  • SEM analysis revealed that mechanical overloads, stemming from excessive repetitive limb use or accidental injuries, were the predominant cause of fracture.
  • Excessive fatigue loading, compounded by screw interactions within threaded holes, significantly contributed to implant failure.
  • Fracture was observed in pure titanium, titanium alloy, and stainless steel implants, indicating material-independent mechanical overload issues.

Conclusions:

  • The fracture of orthopedic implants is primarily attributed to mechanical overloads and fatigue, often exceeding design tolerances.
  • Increasing patient weight and physical activity levels place greater demands on implants, potentially leading to premature failure.
  • Current orthopedic implant designs may be insufficient to reliably manage the mechanical stresses imposed by modern patient populations, suggesting a need for design improvements.