"Lumbar support implants" typically refer to internal spinal fixation systems (such as pedicle screws and connecting rods) or interbody fusion cages.
Titanium alloy: Currently the most widely used material in clinical practice. It offers excellent biocompatibility and corrosion resistance; its elastic modulus closely matches that of human bone, helping to minimize the "stress shielding" effect, and it does not interfere with postoperative MRI scans.
Polyetheretherketone (PEEK): A high-performance medical polymer. Its elastic modulus closely matches bone tissue, effectively preventing stress concentration; it is radiolucent (appearing semi-transparent on X-rays), facilitating imaging assessment; and it causes no sensation of a foreign metallic body. It is commonly used for interbody fusion cages.
Stainless steel: A traditional fixation material known for high strength and low cost. However, due to its high density and tendency to cause artifacts that interfere with imaging, its use in modern spinal surgery is gradually declining.
Cobalt-chromium alloy: Characterized by high hardness and superior wear resistance, it is often used in applications requiring high load-bearing capacity; however, some individuals may be at risk of metal ion allergies.
