Minimally Invasive Transforaminal Lumbar Interbody Fusion with Unilateral Pedicle Screw Fixation: Comparison between Primary and Revision Surgery

Table 1

Characteristics of patients who underwent minimally invasive TLIF.

Characteristics	MIS TLIF		𝑃 value
	Primary (%)	Revision (%)
Number of patients	25	21
Mean age (yrs)	57.4±14.1	51.5±12.6	0.19*
Sex			0.77†
Male	14	13
Female	11	8
Follow-up (ms)	17.6±4.7	16.3±3.2	0.45*
Level of fusion			0.76†
L4-5	18	14
L5–S1	7	7
Operation time (mins)	88.8±42.6	88.4±20.7	0.66*
Blood loss (mL)	94.4±122.1	87.5±62.6	0.70*
Complication	3 (12)	4 (19)	0.44†
Dural tear	1 (4)	4 (19)	0.16†
Cage migration	2 (8)	0	1.00†
Others	0	0	—
Reoperation	1‡	0	1.00†
Fusion
Grade I	20 (80)	16 (76)	1.00†
Grade II	5	5

Between groups comparison with *Mann-Whitney test and †Fisher's Exact test. ‡Reoperation was done due to cage migration.