This materials science study develops a ternary Zn–1Cu–0.1Ti alloy for biodegradable orthopedic implants. Three processing states (as-cast, hot-rolled, hot-rolled plus cold-rolled) were compared across mechanical strength, corrosion, wear, biocompatibility, and antibacterial activity. The goal is to determine whether this alloy meets the property requirements for temporary bone fixation hardware.
Current fracture fixation hardware for osteoporotic bone requires a second surgery for removal — a real morbidity burden that biodegradable metals could eliminate. Zinc alloys are the leading candidate because their degradation rate sits between too-fast Mg alloys and too-slow Fe alloys, but pure Zn is mechanically inadequate for load-bearing applications.
This paper establishes that the Zn–1Cu–0.1Ti alloy, when hot-rolled plus cold-rolled, achieves tensile properties (yield strength 204 MPa, elongation 75%) that approach the range needed for bone screws and plates, while simultaneously meeting ISO hemolysis and antibacterial thresholds. The Cu addition provides genuine antibacterial benefit beyond pure Zn. A meaningful advantage given that implant infection rates remain 4–6% even with prophylactic antibiotics.
The key design tension to understand: no single processing condition is optimal across all parameters. HR+CR gives you the best mechanics but intermediate corrosion resistance. If you are designing a screw, you need to decide which property governs failure first. And that answer depends on the fracture type, bone quality, and expected healing timeline.
The authors confirm that all biocompatibility data are in vitro, and direct-contact cytotoxicity is consistently poor due to local ion concentration effects that likely overestimate in vivo toxicity. Clinical translation still requires in vivo validation.
This materials science study develops a ternary Zn–1Cu–0.1Ti alloy for biodegradable orthopedic implants. Three processing states (as-cast, hot-rolled, hot-rolled plus cold-rolled) were compared across mechanical strength, corrosion, wear, biocompatibility, and antibacterial activity. The goal is to determine whether this alloy meets the property requirements for temporary bone fixation hardware.
Current fracture fixation hardware for osteoporotic bone requires a second surgery for removal — a real morbidity burden that biodegradable metals could eliminate. Zinc alloys are the leading candidate because their degradation rate sits between too-fast Mg alloys and too-slow Fe alloys, but pure Zn is mechanically inadequate for load-bearing applications.
This paper establishes that the Zn–1Cu–0.1Ti alloy, when hot-rolled plus cold-rolled, achieves tensile properties (yield strength 204 MPa, elongation 75%) that approach the range needed for bone screws and plates, while simultaneously meeting ISO hemolysis and antibacterial thresholds. The Cu addition provides genuine antibacterial benefit beyond pure Zn. A meaningful advantage given that implant infection rates remain 4–6% even with prophylactic antibiotics.
The key design tension to understand: no single processing condition is optimal across all parameters. HR+CR gives you the best mechanics but intermediate corrosion resistance. If you are designing a screw, you need to decide which property governs failure first. And that answer depends on the fracture type, bone quality, and expected healing timeline.
The authors confirm that all biocompatibility data are in vitro, and direct-contact cytotoxicity is consistently poor due to local ion concentration effects that likely overestimate in vivo toxicity. Clinical translation still requires in vivo validation.