TABLE 4.

Reoperations

Patient ID	Index Level	Adverse Event	Time From Index Surgery to Reoperation (Months)	TOPS Removed?	Surgical Outcome
1	L4-5	Retained drain	1.7	No	Removal of retained drain. Patient was offered removal during the index hospitalization but elected to delay removal until 1.7 m postoperatively.
2	L4-5	Worse LBP	6.6	Yes	Removal of TOPS and conversion to single-level posterolateral fusion
3	L4-5	Seroma	2.5	Yes	Wound exploration and TOPS removal
4	L4-5	Dural Tear Persistent CSF Leak Persistent CSF Leak with severe leg pain Pseudomeningocele	0.6 11.1 11.5 17.4	Yes (replaced) Yes (convert to fusion) n/a n/a	Removal of TOPS, dural repair, placement of new TOPS Removal of TOPS, dural repair, conversion to single-level posterolateral fusion Wound exploration Wound exploration and shunt implantation
5	L4-5	Loose pedicle screws at L5	17.2	Yes	Two-stage revision including removal of TOPS followed by ALIF at L4-5
6	L3-4	Wound infection dural tear	0.4 0.9	No Yes	Irrigation and debridement Removal of TOPS, dural repair (subsequent ALIF at L3-4)
7	L3-4	Hematoma	0.4	No	Hematoma evacuation
8	L4-5	Retained drain	0.1	No	Removal of retained drain
9	L4-5	Pedicle screw misplacement	0.2	No	Revision of L4 pedicle screws

ALIF indicates anterior lumbar interbody fusion, CSF, cerebrospinal fluid; LBP, low back pain; TOPS, Total Posterior Spine System.