Factors Associated with Bone Union Failure After Frozen Autograft Reconstruction in Lower Limb Osteosarcoma

Area of Science:

• Orthopedic Surgery
• Oncology
• Biomaterials Science

Background:

• Biological reconstruction using liquid nitrogen-treated frozen autografts is established for malignant bone tumors.
• Nonunion remains a significant complication, hindering successful integration of the graft with host bone.

Purpose of the Study:

• To identify factors influencing bone union in patients with lower extremity long bone osteosarcoma treated with frozen autografts.
• To evaluate the impact of fixation methods on bone healing in this specific patient population.

Main Methods:

• Retrospective analysis of 35 osteosarcoma patients treated between 1999 and 2023.
• Assessment of factors including fixation method (plate vs. intramedullary nail), technique, and chemotherapy.
• Comparison of bone union rates and time to union between different fixation strategies.

Main Results:

• Nonunion occurred in 40% of intramedullary nail cases versus 8.0% of plate fixation cases.
• Intramedullary nail use was significantly associated with higher nonunion rates (p < 0.05).
• Plate fixation demonstrated a shorter mean union time (5.8 months) compared to intramedullary nails (7.2 months).

Conclusions:

• Intramedullary nail fixation is linked to a higher incidence of nonunion in biological reconstructions of long bones.
• Multiple-plate fixation may offer superior bone union rates compared to single-plate fixation in frozen autograft procedures.
• Consideration of multiple-plate fixation is recommended for optimizing outcomes in lower limb osteosarcoma reconstruction.