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Updated: Mar 31, 2026
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Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability
Published on: July 25, 2025
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PEEK-Halo effect in interbody fusion
Kevin Phan1, Jarred A Hogan2, Yusuf Assem2
1Neuro Spine Clinic, Suite 7a, Level 7 Prince of Wales Private Hospital, Barker Street, Randwick, NSW 2031, Australia; NeuroSpine Surgery Research Group (NSURG), Sydney, NSW, Australia.
Summary
The PEEK-Halo effect, a complication of poly[aryl-ether-ether-ketone] implants in spinal fusion, indicates poor bone integration. Titanium-PEEK composites prevent this effect, suggesting titanium enhances osseointegration.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Medical Imaging
Background:
- Poly[aryl-ether-ether-ketone] (PEEK) is widely used in vertebral body fusion.
- Titanium-PEEK (Ti-PEEK) composites and coatings are novel approaches to enhance PEEK implants.
- A potential complication of PEEK implants is the
Purpose of the Study:
- To describe the
Main Methods:
- Comparative analysis of PEEK versus Ti-PEEK implants in two patients undergoing anterior lumbar interbody fusion (ALIF).
- Assessment of osseointegration using CT imaging and histological preparations in a sheep tibia model.
- Evaluation of the bone-implant interface for the
Main Results:
- The PEEK-Halo effect, characterized by a halo on CT imaging between the implant and bone graft, was observed with PEEK implants.
- This effect signifies poor osseointegration of PEEK implants.
- The PEEK-Halo effect was absent in the patient receiving a Ti-PEEK composite implant.
- Histological analysis confirmed poorer osseointegration with PEEK compared to Ti-PEEK implants in the sheep model.
Conclusions:
- The PEEK-Halo effect is associated with minimal osseointegration of PEEK at the vertebral endplate.
- Ti-PEEK composite implants do not exhibit the PEEK-Halo effect.
- Titanium incorporation may improve the bone-implant interface for PEEK substrates, enhancing osseointegration.
