Accidental Durotomy in Minimally Invasive Transforaminal Lumbar Interbody Fusion: Frequency, Risk Factors, and Management

Table 5

Number and relation of accidental durotomies and history of previous surgery.

Durotomy		Previous surgery		Total
		No	Yes
	Levels operated	357	125	482
No	% without durotomy	74.1%	25.9%	100%
	% within group of previous surgery	94.7%	91.7%
	Levels operated	20	12	32
Yes	% with durotomy	62.5%	37.5%	100%
	% within group of previous surgery	5.3%	8.3%

The two-tailed Fisher exact test showed no statistically significant relation between accidental durotomies and history of previous surgery in the level of MIS TLIF ( = 0.1535).