Table 3.

Percentage BMD change between baseline, 12-month follow-up, and 24-month follow-up

	Anterior/posterior images			Lateral images
	12 months	p	24 months	p	12 months	p	24 months	p
Fixed bearing (n = 23)
All ROIs	-2.3	0.02	-1.1	0.4	-11.5	< 0.01	-4.1	0.1
ROI1	-2.3	< 0.01	-0.9	0.5	-11.0	0.06	-2.4	0.5
ROI2	-2.9	0.03	-3.3	0.2	-17.0	< 0.01	-5.2	0.07
ROI3	-1.7	0.3	0.9	0.6	-9.2	0.7	-4.8	0.5
Mobile bearing (n = 23)
All ROIs	-8.8	0.04	-0.8	0.4	-11.8	< 0.01	-6.2	< 0.01
ROI1	-8.5	< 0.01	-2.1	0.3	-16.5	< 0.01	-10.4	< 0.01
ROI2	-11.9	0.06	-2.0	0.2	-12.8	< 0.01	-6.8	0.1
ROI3	-7.0	0.2	1.9	0.6	-10.8	0.2	-1.5	0.3

ROIs: regions of interest.