A research collaboration led by the University of Hyderabad has developed titanium-cobalt-chromium alloys that could make medical implants stronger, more durable and safer, although the materials have so far been tested only in laboratories.
Researchers from the University of Hyderabad, IIT Delhi, IIT Bhubaneswar and CSIR-Central Electrochemical Research Institute in Karaikudi developed the alloys by combining titanium, cobalt and chromium in equal or near-equal proportions. The findings were published in Advanced Healthcare Materials, a peer-reviewed journal published by Wiley.
The research focused on multi-principal element alloys, or MPEAs, in which no single metal forms the dominant base. The team said this approach produced alloys with high strength, wear resistance and corrosion resistance, along with compatibility with living cells in laboratory tests.
The potential applications include artificial hip joints and bone plates. Such implants need to withstand repeated movement and physical stress while remaining stable inside the body. The researchers reported that the titanium-cobalt-chromium alloys showed properties relevant to these requirements, including resistance to wear and corrosion.
Conventional medical implants generally use alloys in which one metal forms the base. According to the researchers, these materials can wear down or corrode over time, potentially releasing metal ions into the surrounding tissue. Their stiffness can also be considerably higher than that of natural bone, which may contribute to implant loosening and the need for further surgery.
The new alloys were reported to have flexibility closer to that of natural bone than conventional implant metals. This characteristic could help address the mismatch between an implant and the surrounding bone, although the study does not establish how the material would perform in patients.
To assess corrosion resistance, the team tested the alloys in fluids designed to mimic conditions inside the human body. The materials resisted corrosion in those tests. Cell studies also found that the alloys supported healthy cell growth without toxic effects, according to the research team.
The study formed part of the doctoral research of Nanda Kishore Karnam, supervised by Professor Koteswararao V. Rajulapati of the University of Hyderabad’s School of Engineering Sciences and Technology. The research team also included Dr Junaid Syed and Professor Nitya Nand Gosvami of IIT Delhi; Ravishankar Suman and Professor Srikant Gollapudi of IIT Bhubaneswar; and Dr Ann Mary Mathew and Dr Deepak Kumar Pattanayak of CSIR-Central Electrochemical Research Institute.
The combination of strength, wear resistance, corrosion resistance and cell compatibility makes the alloys promising candidates for future medical implants, the researchers said. However, the findings remain limited to laboratory testing. Further evaluation will be required before the materials can be used in patients, and the study does not announce a clinical application or approval for medical use.
