Table 1.

Demographic characteristics

	Local bone graft	ICBG	Statistical analysis
Number of patients	42	40	N.S.
Sex
Male	22	18	N.S.
Female	20	22
Age, mean (range), years	66 ± 5.5 (50–87)	67 ± 6.0 (49–83)	N.S.
Symptom duration, mean (range), years	4.5 (1–15)	4.3 (1–14)	N.S.
Follow-up after surgery, mean (range), years	2.5 (2–5)	3.5 (2–5)	N.S.
Pain score before surgery
Low back pain
Visual analog scale (VAS)	4.6 ± 1.4	4.3 ± 2.0	N.S.
Japanese orthopedic association score (JOAS)	1.4 ± 0.4	1.2 ± 0.3	N.S.
Oswestry Disability Index (ODI)	44 ± 15	36 ± 10	N.S.
Leg pain
Visual Analog Scale (VAS)	8.0 ± 2.0	7.7 ± 2.5	N.S.
Japanese orthopedic association score (JOAS)	0.8 ± 0.2	1.1 ± 0.4	N.S.