[EXPERIMENTAL STUDY ON POLY-AMINO ACID/NANO-HYDROXYAPATITE/CALCIUM SULFATE CAGE FOR LUMBAR INTERBODY FUSION IN GOATS]

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Spinal Fusion Research

Background:

• Lumbar interbody fusion is a critical surgical procedure.
• Developing effective fusion cages is essential for spinal stability.
• The poly-amino acid/nano-hydroxyapatite/calcium sulfate (PHC) Cage is a novel biomaterial for spinal fusion.

Purpose of the Study:

• To evaluate the efficacy of the PHC Cage in promoting lumbar interbody fusion in a goat model.
• To compare the PHC Cage with a titanium Cage and autologous ilium graft.

Main Methods:

• A randomized study involving 18 goats divided into three groups: PHC Cage, titanium Cage, and ilium graft.
• Surgical discectomy and interbody fusion were performed.
• Assessment included disc space height measurements, 3D CT reconstruction, modified Brantigan grading, biomechanical testing, and histological/SEM analysis over 24 weeks.

Main Results:

• The PHC Cage group showed effective bony fusion, comparable to the ilium group and superior to the titanium Cage group based on CT grading.
• Disc space height was maintained significantly better in the PHC and titanium groups compared to the ilium group at 12 and 24 weeks.
• Biomechanical testing revealed no significant difference in range of motion between PHC and titanium cages, both being significantly lower than the ilium group.
• Histological analysis indicated a compact interface with osseous tissue integration for the PHC Cage, unlike the titanium Cage which showed soft tissue ingrowth.

Conclusions:

• The PHC Cage is an effective option for lumbar interbody fusion in a goat model.
• The PHC Cage promotes excellent bone integration and stability.
• Further investigation into the long-term degradation profile of the PHC Cage is warranted.