Spine fusion using cell matrix composites enriched in bone marrow-derived cells.

Area of Science:

• Orthopedic Surgery
• Regenerative Medicine
• Biomaterials Science

Background:

• Bone marrow aspirates contain osteoprogenitor cells essential for bone healing.
• Concentrating these cells onto implantable matrices can create effective cellular composite grafts.
• The potential benefit of incorporating a bone marrow clot into these grafts requires investigation.

Purpose of the Study:

• To test if the biologic milieu of a bone marrow clot enhances the efficacy of enriched cellular composite bone grafts.
• To evaluate the impact of bone marrow clot addition on spinal fusion outcomes.

Main Methods:

• Utilized an established posterior spinal fusion model with cancellous bone matrix.
• Compared three graft types: enriched cellular composite graft alone, bone matrix plus bone marrow clot, and enriched cellular composite graft plus bone marrow clot.
• Assessed outcomes using union score, quantitative computed tomography, and mechanical testing.

Main Results:

• The enriched cellular composite graft plus bone marrow clot demonstrated a superior union score compared to the enriched graft alone and bone matrix plus clot.
• This combination also showed significant improvements in fusion volume and area compared to the enriched graft alone.
• The addition of a bone marrow clot markedly improved overall graft performance.

Conclusions:

• Incorporating a bone marrow clot into an enriched cell-matrix composite graft significantly enhances bone graft performance.
• This strategy provides a rapid, simple, safe, and cost-effective method for concentrating and delivering bone marrow-derived cells.
• The findings suggest improved outcomes for bone grafting procedures using this enhanced composite graft.