Table 2.

Comparison of Clinical Outcomes with or without Loosening.

	Loosening			P
	Overall (n=32)	(–) (n=11)	(+) (n=21)
Pain score before surgery
ODI# (%)	53.9±27	59±29	51.3±26.9	0.59
RDQ# (points)	17±6.4	14±8.5	17.9±5.9	0.38
VAS# (Lumbar)	7.1±3.7	7.3±3.2	6.9±2.6	0.18
Pain score after surgery
ODI# (%)	22.8±19.8	10.8±9.6	29±21.9	<0.05*
RDQ# (points)	8.7±6.8	6±4.47	10.1±7.5	0.28
VAS# (Lumbar)	3.4±2.6	1.3±0.9	4.7±2.5	<0.05*

ODI=Oswestry Disability Index; RDQ=Roland–Morris Disability Questionnaire; VAS=visual analog scale

^#Mean±standard deviation (SD)

P denotes significance of difference between patients in groups with (+) and without (–) loosening.

*P<0.05