A Comparison of In-vitro Staphylococcus aureus Growth on Rough and Smooth Titanium Surfaces

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Microbiology

Background:

• Textured titanium surfaces are common in total hip arthroplasty (THA) implants to enhance osseointegration.
• These surfaces may inadvertently promote bacterial adherence, increasing the risk of implant-associated infections.

Purpose of the Study:

• To characterize and compare bacterial growth and viability on different titanium surface topographies used in THA.
• To investigate the influence of surface roughness on Staphylococcus aureus adherence and proliferation.

Main Methods:

• Comparison of bacterial coverage on smooth and rough titanium samples using fluorescence imaging and ImageJ software.
• Quantification of Staphylococcus aureus growth at multiple time points (6, 12, 24 hours).
• Microscopic analysis of surface structure and bacterial adherence using scanning electron microscopy (SEM).

Main Results:

• Rough titanium surfaces exhibited significantly greater bacterial coverage than smooth surfaces at all tested time points.
• Bacterial proliferation, including extracellular matrix formation indicative of biofilm, was more pronounced on rough surfaces.
• SEM confirmed increased bacterial adherence and growth on the irregular microtopography of rough titanium.

Conclusions:

• Rough titanium surfaces facilitate enhanced in-vitro Staphylococcus aureus growth and early biofilm formation.
• Surface topography plays a critical role in bacterial colonization on THA implants.
• Findings suggest a potential link between rough implant surfaces and increased infection risk in total hip arthroplasty.