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

Table 4

Number and relation of accidental durotomies and patient age.

Durotomy		Age		Total
		<65 years	≥65 years
	Levels operated	201	281	482
No	% without durotomy	41.7%	58.3%	100%
	% within age cohort	96.2%	92.1%
	Levels operated	8	24	32
Yes	% with durotomy	25.0%	75.0%	100%
	% within age cohort	3.8%	7.9%

The two-tailed Fisher exact test showed no statistically significant relation between accidental durotomies and age cohort ( = 0.0657).