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In zone IV, type IV was the most frequent LA type at L3 (n=44; 88.0%), L4 (n=42; 93.3%), and L5 (n=6; 100%). CONCLUSIONS The risk of LA injury during OLIF is the least when the cage is placed in zones II and III. Care is required during OLIF in zone IV of L3-L5. The fixation pin should be fixed on the upper edge of the lower vertebral body at L1-L2 and L2-L3, and on the lower edge of the upper vertebral body at L3-L4 and L4-L5. BACKGROUND Osteoblastomas are rare primary bone tumors with a predilection for the spine. The extraosseous grow
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