Table 2.

Sclerotic bone areas as assessed by CT

	Sclerotic area (mm2; range)
	Immediately following operation	3 months following operation	9 months following operation	24 months following operation
Autograft only (group 1)	148.3±11.9 (136–168)	138.3±15.1* (122–160)	118.8±19.0 (95–141)	111.5±8.6 (103–126)
Autograft + OP-1 (group 2)	121.5±12.5 (111–140)	74.0±14.1* (59–93)	44.7±11.3** (31–62)	31.7±6.8*** (25–40)
Allograft + OP-1 (group 3)	133.7±9.2 (121–144)	103.6±13.2* (89–122)	77.2±7.8** (69–86)	55.6±11.7*** (42–69)

*p<0.05 vs. before operation

**p<0.05 vs. 3 months following operation and p<0.01 vs. before operation

***p<0.05 vs. autograft only