Introduction
In the field of medical technology, researchers and engineers have been working on developing materials and devices that can aid in healing and bone regeneration while minimizing the need for invasive procedures. One such innovation is biodegradable magnesium implants, which are designed to gradually dissolve within the body's physiological environment during and after bone healing. Unlike conventional permanent implants made from titanium or stainless steel, these implants are temporary and eliminate the need for a secondary surgical removal procedure.
What are biodegradable magnesium implants?
Biodegradable magnesium implants, also referred to as bioabsorbable magnesium implants, resorbable magnesium implants, or degradable magnesium implants, are temporary surgical implants fabricated from magnesium and its alloys. These implants are designed to degrade once the bone has healed, making them an attractive option for surgeons and patients alike.
History and development
The first regulatory-approved resorbable metallic orthopaedic implant, the MAGNEZIX compression screw, received CE marking in 2013. As of 2026, multiple companies across Europe, Asia, and North America hold approved or breakthrough-designated products, targeting markets in orthopaedic trauma and spinal surgery valued in excess of USD 9 billion.
Key facts and benefits
- Magnesium is the fourth most abundant cation in the human body and an essential component of bone mineral, contributing to its inherent biocompatibility.
- The elastic modulus of magnesium (41–45 GPa) is considerably closer to that of cortical bone (10–30 GPa) than conventional permanent metallic biomaterials such as titanium alloys (~110 GPa) or stainless steel (~200 GPa), reducing the stress shielding effect that can inhibit bone remodelling and lead to bone resorption.
- Beyond passive compatibility, magnesium ions released during degradation have been shown to actively promote osteogenesis, stimulate angiogenesis, and modulate immune responses in the bone microenvironment.
Applications and examples
Biodegradable magnesium implants are used in various clinical forms, including:
- Screws
- Pins
- Plates
- Intramedullary nails
- Bioresorbable coronary scaffolds
Challenges and limitations
Despite growing clinical adoption, challenges related to corrosion rate control, stress corrosion cracking (SCC), hydrogen gas evolution, and regulatory standardisation continue to restrict broader deployment. An active area of research involves developing quantitative design parameters, such as SCC stress thresholds, to support safe implant design beyond comparative susceptibility ranking.
FAQ
What is the primary benefit of biodegradable magnesium implants? A biodegradable magnesium implant eliminates the need for a secondary surgical removal procedure, making it a more convenient and less invasive option for patients.
What is the key difference between biodegradable magnesium implants and conventional permanent implants? The key difference is that biodegradable magnesium implants are designed to degrade once the bone has healed, whereas conventional permanent implants remain in the body permanently.
How long does it typically take for biodegradable magnesium implants to degrade? The exact degradation time of biodegradable magnesium implants can vary depending on factors such as the specific alloy used and the individual's physiological environment, but it is generally designed to degrade within a few months to a few years.
What are some of the challenges facing the development of biodegradable magnesium implants? Some of the challenges facing the development of biodegradable magnesium implants include corrosion rate control, stress corrosion cracking (SCC), hydrogen gas evolution, and regulatory standardisation.