Superior Facet Joint Violations during Single Level Minimally Invasive Transforaminal Lumbar Interbody Fusion: A Preliminary Retrospective Clinical Study

Table 2

Relationship between FV and relevant factors.

Factors	Patient ()	Relationship between facet joint and patient
		Grade 1	Grade 2 + 3
Gender				0.653
Male	51	32	19 (grade 2: 15, grade 3: 4)
Female	48	28	20 (grade 2: 17, grade 3: 3)
Age				0.566
<60	60	35	25 (grade 2: 21, grade 3: 4)
>60	39	25	14 (grade 2: 11, grade 3: 3)
BMI				<0.00
<30 kg/m^2	62	46	16 (grade 2: 14, grade 3: 2)
>30 kg/m^2	37	14	23 (grade 2: 18, grade 3: 5)
Top-screw
L3	4	4	0 (grade 2: 0, grade 3: 0)
L4	66	44	22 (grade 2: 21, grade 3: 1)
L5	29	12	17 (grade 2: 11, grade 3: 6)
Decompression				0.864
Unilateral decompression	87	53	34 (grade 2: 27, grade 3: 7)
Bilateral decompression	12	7	5 (grade 2: 5, grade 3: 0)

BMI: body mass index; represents significant differences.