Table 3

Results of Functional Assessments for Pain and Disability in 30 Patients Undergoing Percutaneous Transforaminal Lumbar Interbody Fusion (PTLIF).

Data	Non-expandable PEEK interbody implant	Expandable titanium interbody implant (n = 20)		Total patients (n = 30)
Data	Primary surgery (group A) (n = 10)	Primary surgery (group B) (n = 10)	Revision surgery (group C) (n = 10)	Total patients (n = 30)
Back pain, VAS scores, mean
Preoperatively	6.8	6.4	7.2	6.9
Postoperatively (first week)	4.2^*	5.0^*	4.9^*	4.8^*
Follow-up (mo)
1	3.4^*	3.2^*	4.6^*	3.7^*
3	2.8^*	2.2^*	3.1^*	2.6^*
6	2.1^*	1.5^*	3.3^*	2.3^*
12	3.0^*	1.5^*	3.8^*	2.5^*
24	3.0^*	0.9^*	3.2^*	2.4^*
Leg pain, VAS scores
Preoperatively	7.2	7.3	7.4	7.4
Postoperatively (first week)	5.1^*	3.7^*	4.0^*	4.1^*
Follow-up (mo)
1	3.7^*	2.4^*	3.0^*	2.8^*
3	2.3^*	1.4^*	1.7^*	1.5^*
6	1.7^*	1.8^*	1.0^*	1.3^*
12	1.3^*	1.8	2.0^*	1.4^*
24	1.3^*	0.2^*	1.0^*	0.8^*
ODI score, mean
Preoperatively	31.9	33.3	35.4	34.2
Postoperatively (first week)	23.4^*	25.4^*	27.3^*	25.3^*
Follow-up (monts)
1	17.4^*	19.6^*	22.3	19.4^*
3	14.3^*	15.0^*	17.0^*	14.7^*
6	12.6^*	12.8^*	15.1^*	13.0^*
12	12.0^*	11.5^*	15.8^*	12.0^*
24	12.0^*	11.2^*	15.2^*	12.8^*

↵* P < 0.05 compared to preoperative values. VAS: visual analog scale. ODI: Oswestry Disability Index.