Cu-loaded Brushite bone cements with good antibacterial activity and operability

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Infectious Disease

Background:

• Bone defect surgeries carry risks of infection and inflammation.
• Prolonged antibiotic use in bone defect treatment contributes to antibiotic resistance.
• Novel biomaterials are needed to address these challenges.

Purpose of the Study:

• To design and evaluate copper-loaded brushite bone cements for bone defect repair.
• To assess the antibacterial properties and biocompatibility of these novel cements.

Main Methods:

• Copper-loaded brushite bone cements were synthesized with varying copper content.
• Properties evaluated included setting time, injectability, crystal phase, compressive strength, and degradability.
• Antibacterial activity against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa was tested.
• Cellular affinity with mouse bone marrow stem cells was assessed in vitro.

Main Results:

• Setting time increased with copper content (12-50 min).
• Cements exhibited anti-washout properties (88% injectability) and improved compressive strength.
• Brushite was the dominant phase, with some calcium copper phosphate formation observed.
• Effective inhibition of bacterial growth and proliferation was demonstrated, increasing with copper content.
• Good cellular affinity to mouse bone marrow stem cells was observed at lower copper doses.

Conclusions:

• Copper-loaded brushite bone cements are injectable, degradable, and possess antibacterial properties.
• These cements show potential for bone tissue defect repair and regeneration.
• The study highlights the efficacy of copper incorporation for enhancing bone cement functionality.