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A Anteroposterior and lateral radiographs of L4–S1 fusion. There was complete agreement between the two observers that there was no evidence of loosening in relation to any of the cages. Also note the presence of bone within the cages at L4/5. B. Sagittal CT MPR of the same case. Both observers agreed on the presence of a radiolucent interface between the left L5/S1 cage and the L5 endplate, indicating that it was not fused
