An analysis of spinal implant collapse

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Expandable interbody cages have gained popularity in spinal fusion surgeries for their ease of placement and potential for superior outcomes. However, their long-term mechanical stability remains under scrutiny. In this retrospective study, I led an analysis of postoperative imaging from over 75 patients who underwent transforaminal lumbar interbody fusion (TLIF) with screw-based expandable cages.

By quantifying cage area changes over time, we identified that the most significant collapse occurred within the first 100 days post-surgery, gradually tapering as spinal fusion progressed. These findings offer valuable insights into postoperative biomechanics and underscore the importance of early monitoring. The results support future efforts to refine implant design and improve long-term outcomes in spine surgery.