Metallic Implants Used in Lumbar Interbody Fusion

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Materials Engineering

Background:

• Spinal fusion techniques and pedicle fixation systems have advanced for better lumbar interbody fusion (LIF) outcomes.
• Metal alloys, particularly titanium, are prevalent in spinal instrumentation due to their mechanical properties.

Purpose of the Study:

• To review the physical, mechanical, and corrosion resistance properties of metal alloys used in LIF spinal instrumentation.
• To describe the biological responses elicited by implanted biomaterials in LIF.

Main Methods:

• Literature review of metal alloys for spinal instrumentation in LIF.
• Analysis of fatigue strength, Young's modulus, and corrosion resistance of alloys.
• Examination of innate and adaptive immune responses to implanted biomaterials.

Main Results:

• Titanium alloys, cobalt-chromium, nitinol, and stainless steel are key materials for LIF implants.
• Ideal LIF implants require high strength, bone-like modulus, and excellent corrosion resistance.
• Implanted materials trigger immune responses influencing healing, fusion, and potential adverse reactions.

Conclusions:

• Understanding biomaterial properties and biological interactions is crucial for successful LIF.
• Optimizing implant materials can enhance fusion rates and minimize complications like implant loosening.
• Further research into material-biological interactions will guide the development of next-generation spinal implants.