MRI Assessment of the Early Disc Degeneration Two Levels above Fused Lumbar Spine Segment: A Comparison after Unilateral and Bilateral Transforaminal Lumbar Interbody Fusion (TLIF) Procedure

MRI评估融合腰椎节段上方两节段早期椎间盘退变：单侧与双侧经椎间孔腰椎椎体间融合术（TLIF）后的比较