Head-neck taper corrosion in hip arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Implant Corrosion

Background:

• Modular femoral components in total hip arthroplasty (THA) offer design flexibility, reducing inventory and enabling patient-specific adjustments.
• The transition from monoblock to modular designs introduces a potential site for mechanically assisted crevice corrosion at the taper junction.
• Increasing use of larger femoral head sizes in THA, alongside improved bearing materials, correlates with rising revision rates.

Purpose of the Study:

• To review the pathogenesis and risk factors associated with taper corrosion at the femoral component's head-neck junction in THA.
• To discuss clinical assessment strategies for identifying taper corrosion.
• To outline current management options for taper corrosion in hip arthroplasty.

Main Methods:

• Literature review focusing on biomechanical principles, material science, and clinical outcomes related to modular taper junctions in THA.
• Analysis of factors contributing to corrosion, including geometric parameters, material combinations, and femoral head size.
• Synthesis of information on diagnostic methods and treatment approaches for taper corrosion.

Main Results:

• Taper corrosion is influenced by multiple factors, including the taper's geometry, the materials used (e.g., titanium alloys, cobalt-chrome), and the size of the femoral head.
• Mechanically assisted crevice corrosion is a primary mechanism, exacerbated by micromotion at the modular interface.
• Clinical presentation can vary, necessitating careful assessment to diagnose taper corrosion accurately.

Conclusions:

• Taper corrosion is a significant concern in modular THA, potentially impacting implant longevity and patient outcomes.
• Understanding the multifactorial nature of taper corrosion is crucial for prevention and effective management.
• Further research is needed to optimize modular interface design and mitigate corrosion risks in hip arthroplasty.