Residual Al₂O₃ From Grit Blasted Components Operate as Third Body Wear Particles in Total Knee Arthroplasty: An...

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Tribology

Background:

• Total knee arthroplasty (TKA) is a common procedure, but device failure necessitates costly revision surgeries.
• Grit blasting is used to enhance TKA implant surface roughness, potentially improving outcomes.
• Residual alumina from grit blasting may embed in implant surfaces.

Purpose of the Study:

• To investigate the presence and potential sources of alumina on explanted TKA components.
• To explore mechanisms of alumina migration within the TKA implant system.
• To assess the clinical relevance of alumina contamination on femoral components.

Main Methods:

• Analysis of 21 explanted CoCrMo femoral and 21 grit-blasted tibial components.
• Utilized optical microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS).
• Evaluated alumina presence and distribution on implant surfaces.

Main Results:

• Approximately 34% of tibial component surfaces showed embedded residual alumina.
• Alumina debris, identified as third-body wear particles, was found on 81% of femoral components.
• Significant alumina transfer observed on components with polyethylene wear and suspected direct metal-to-metal contact.

Conclusions:

• Residual alumina from grit blasting is a potential source of third-body wear particles in TKAs.
• Alumina contamination may occur on femoral components, particularly with polyethylene wear.
• Further research is needed to determine the clinical impact of alumina wear particles on TKA performance.