Osteobiologics

Area of Science:

• Spine Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Osteobiologics are engineered materials used to enhance bone healing, increasingly adopted in spinal fusion procedures.
• Historically, autologous iliac crest bone grafts were standard, but donor site morbidity prompted research into alternatives.
• These alternatives include allograft bone, biomaterial scaffolds, growth factors, and stem cells.

Purpose of the Study:

• To conduct a literature review of current and emerging osteobiologic technologies for spine fusion.

Main Methods:

• A comprehensive literature search was performed using PubMed.
• Search terms included "spine," "fusion," "osteobiologics," "autologous," "allogen(e)ic," "graft," "scaffold," "bone morphogenic protein," and "stem cells."
• English-language studies were prioritized.

Main Results:

• Allograft bone is supported as a supplement or replacement for autologous grafts when autograft is limited.
• Ceramics and P-15 show potential, but require more human trials.
• Recombinant human bone morphogenic proteins (rhBMPs) 2 and 7 have shown efficacy, particularly rhBMP-2 in specific patient groups, while rhBMP-7 has limited evidence.
• Stem cells demonstrate significant potential in animal models, but human trial data is limited by product quality.

Conclusions:

• Engineered stem cells overexpressing osteoinductive factors are poised to be the future of spine fusion.
• Current challenges in applying viral vector-transduced stem cells in humans impede progress.