Table 2.

Change in BMD at 1 and 2 years postoperatively

Measurement outcome	Interval	Region	Slice	Oxford® implant				Genesis® implant				p value
				Mean	SD	95% CI		Mean	SD	95% CI
						Lower	Upper			Lower	Upper
Change in BMD (%)	1 year	Medial cortical	1 & 2	0.0	6.7	−2.7	2.7	−2.5	7.0	−5.2	0.3	0.353
			3 & 4	0.1	4.8	−1.8	2.0	−0.3	6.7	−2.9	2.3	0.403
			5 & 6	−0.6	6.5	−3.2	2.0	−0.9	5.1	−2.9	1.1	0.403
		Medial cancellous	1 & 2	−1.4	2.4	−2.4	−0.5	−2.9	2.8	−4.0	−1.8	0.003
			3 & 4	−2.1	2.8	−3.3	−1.0	−1.7	1.7	−2.4	−1.1	0.569
			5 & 6	−0.7	2.3	−1.6	0.2	−1.5	1.8	−2.2	−0.8	0.264
		Lateral cortical	1 & 2	0.3	4.4	−1.5	2.0	1.8	5.2	−0.2	3.9	0.472
			3 & 4	0.9	6.7	−1.7	3.6	1.7	5.0	−0.2	3.7	0.686
			5 & 6	−0.6	2.9	−1.7	0.6	−0.2	4.7	−2.1	1.6	0.798
		Lateral cancellous	1 & 2	−1.0	2.3	−1.9	−0.1	−2.0	3.1	−3.2	−0.8	0.119
			3 & 4	−1.1	1.6	−1.7	−0.4	−0.6	1.8	−1.3	0.1	0.295
			5 & 6	−0.9	1.1	−1.4	−0.5	−0.5	0.9	−0.9	−0.2	0.062
	2 years	Medial cortical	1 & 2	0.8	7.6	−2.2	3.8	−2.9	6.8	−5.5	−0.2	0.352
			3 & 4	−0.2	6.1	−2.6	2.3	0.6	7.3	−2.2	3.5	0.403
			5 & 6	−1.7	7.7	−4.8	1.4	1.0	4.1	−0.6	2.6	0.403
		Medial cancellous	1 & 2	−1.4	3.7	−2.8	0.1	−3.2	3.9	−4.7	−1.7	0.003
			3 & 4	−2.0	3.1	−3.3	−0.8	−2.0	2.4	−2.9	−1.1	0.569
			5 & 6	−0.8	2.2	−1.7	0.1	−1.7	1.6	−2.4	−1.1	0.264
		Lateral cortical	1 & 2	−0.2	4.7	−2.0	1.7	1.4	5.0	−0.5	3.4	0.472
			3 & 4	1.9	7.6	−1.2	4.9	1.5	4.4	−0.2	3.2	0.687
			5 & 6	−0.8	4.3	−2.5	0.9	0.0	4.8	−1.9	1.9	0.798
		Lateral cancellous	1 & 2	−1.4	2.6	−2.4	−0.3	−1.7	2.1	−2.5	−0.8	0.119
			3 & 4	−1.3	1.5	−1.9	−0.7	−0.7	1.2	−1.2	−0.2	0.295
			5 & 6	−1.1	1.2	−1.5	−0.6	−0.5	0.9	−0.9	−0.1	0.062